Now showing items 1-20 of 39

Structure, mechanical and thermal behaviour of mixtures of polyester resin and dental ceramic waste

Peña Rodriguez, Gabriel; Hector Jaime, Dulce-Moreno; Martinez Maldonado, Lorena (Journal of Physics: Conference SeriesLondres, Reino Unido, 2016-02-12)

The tensile strength and bending strength, structure and thermal behaviour of mixtures of polyester resin (P-2000) and powders (ASTM sieve 200, <75μm) of dental ceramic wastes (dentals impressions, alginate and gypsum) was ...
Electrochemical characterization of the steel wire used as reinforcement in the conductors transmission networks electricity nitride by ion implantation

Hector Jaime, Dulce-Moreno; Aperador Chaparro, William Arnulfo; Castro Maldonado, J J (Journal of Physics: Conference SeriesBogota , Colombia, 2016-02-12)

The power company feature infrastructure, which are generally shaped so the transmission and distribution lines, here is why it is necessary to characterize the process of electrochemical corrosion of these components. In ...
Mechanical and tribological behavior of red clay ceramic tiles coated with fly ash powders by thermal spraying technique

Peña Rodriguez, Gabriel; Hector Jaime, Dulce-Moreno; Daza-Ramírez, J; Orozco-Hernández, S.; Vargas, Fabio (Journal of Physics: Conference SeriesBogota , Colombia, 2017)

The mechanical and tribological performance of red clay ceramic tiles uncoated and coated by oxy-fuel thermal spraying process from fly ash powders was evaluated. The ceramic tile substrates were manufactured by uniaxial ...
Effect of surface roughness on nitriding processes by dielectric barrier discharges of carbon steel

Hector Jaime, Dulce-Moreno; Peña Rodriguez, Gabriel; Quiñonez-Delgado, Y P; Arriaga-Hurtado, L G (Journal of Physics: Conference SeriesBogota , Colombia, 2017-12-29)

Changes in the behaviour of steels to carbon, for three different finishes, surfaces were determined to be nitride by atmospheric pressure dielectric barrier discharge. The surfaces were characterized both morphologically ...
Projection parameters for zirconia-alumina-ceria coatings made by flame spraying from results of numerical simulation

Peña Rodriguez, Gabriel; Ferrer, Martha; Vargas, Fabio; Rodríguez, Luis Francisco (Journal of Physics: Conference SeriesLondres, Inglaterra, 2017-12-29)

A numerical simulation was performed with the software Jets et Poudres, the results let choose the parameters to deposit zirconia-alumina-ceria coatings of different composition on substrates of red clay, by thermal spraying ...
Wear and corrosion behaviour of Al2O3-TiO2 coatings produced by flame thermal projection

Hector Jaime, Dulce-Moreno; Ferrer, Martha; Vargas, Fabio (Journal of Physics: Conference SeriesBogota , Colombia, 2017-12-29)

Evaluated the wear resistance and the coatings corrosion behaviour of Al2O3-TiO2 prepared by thermal spraying by flame on AISI 1020 carbon steel substrates, previously coated with an alloy base Ni. For this purpose, were ...
Optimization of the parameters for obtaining zirconiaalumina coatings, made by flame spraying from results of numerical simulation

Peña Rodriguez, Gabriel; Ferrer, Martha; Vargas, Fabio (Journal of Physics: Conference SeriesLondres , Inglaterra, 2017-12-29)

The K-Sommerfeld values (K) and the melting percentage (% F) obtained by numerical simulation using the Jets et Poudres software were used to find the projection parameters of zirconia-alumina coatings by thermal spraying ...
ForistomApp a Web application for scientific and technological information management of Forsitom foundation

Hector Jaime, Dulce-Moreno; Saavedra-Duarte, L A; Angarita-Jerardino, A; Ruiz, P A; Vera-Rivera, F. H.; V-Niño, E D (Journal of Physics: Conference SeriesBogota , Colombia, 2017-12-29)

Information and Communication Technologies (ICT) are essential in the transfer of knowledge, and the Web tools, as part of ICT, are important for institutions seeking greater visibility of the products developed by their ...
Elaboración y caracterización de recubimientps de polvos de ZnSCu y resinas de poliester sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes

Ferrer, Martha; Rodríguez Vega, Luisa Fernanda; Peña Rodriguez, Gabriel (Bistua Revista De La Facultad De Ciencias BasicasBogota , Colombia, 2018)

En este estudio se elaboran y caracterizan recubrimientos de polvos ZnSCu y resinas de poliéster termoestables sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos ...
Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster

Peña Rodriguez, Gabriel; Rivera-Suárez, Paola A.; González-Gómez, César H.; Parra-Vargas, Carlos A.; Garzón-Posada, Andrés O.; Landínez-Téllez, David A.; Roa-Rojas, Jairo (TecnoLógicasBogota , Colombia, 2018-01-15)

Se reporta el efecto de la concentración de polvos de magnetita (Fe3O4) sobre las propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster termoestable. Las muestras se elaboraron mediante ...
Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material

Cadavid, Edwin; Vargas, Fabio; LÓPEZ GÓMEZ, MARIA ESPERANZA; Mesa, Carlos; Vargas, Fabio; LATORRE, GUILLERMO; Peña Rodriguez, Gabriel (DYNABogota , Colombia, 2018-04-01)

A chromite mineral and two industrial residues produced in the petrochemical and thermoelectric industries, were selected, characterized, processed and deposited on refractory bricks. By means of X-ray fluorescence and ...
Water treatment using porous ceramics based on recycled diatomite and kaolin

MOGOLLON CUELLAR, ZULMA YARLEY; Silva Rivero, Yobana Iris Ney; Peña Rodriguez, Gabriel (Contemporary Engineering SciencesSofia , Bulgaria, 2018-09-06)

The treatment of waters using filtering process through sintered porous ceramics based on diatomite and kaolin is reported. The water samples were prepared in low = 50%, medium = 100% and high = 150% concentrations, ...
Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin

RIVERA, SILVIA FERNANDA; Salazar Ayala, Karen Andrea; Peña Rodriguez, Gabriel (Contemporary Engineering SciencesSofia , Bulgaria, 2018-10-22)

The treatment of underground wastewater is presented. Used at the San Martín 5 mine in the San Roque sector of the municipality of Sardinata (Norte de SantanderColombia); through the process of filtration through bilayer ...
Porous covering compound of clay matrix and coal ashes

Peña Rodriguez, Gabriel; Diaz Fuentes, Carmen Xiomara; Lemus T., J (Contemporary Engineering SciencesSofia , Bulgaria, 2018-11-05)

Here are presented the elaboration and characterization of a composite material with an atomized ceramic paste and flying ashes product of the coal combustion. The samples consist of prismatic tiles of 10x5x1 cm, formed ...
Tortuosidad y permeabilidad de materiales cerámicos mesoporosos de caolín y diatomita

FONSECA PÁEZ, LUIS ALEJANDRO; Peña Rodriguez, Gabriel; Trujillo-Castro, Emanuel (Revista UIS IngenieríasBogota , Colombia, 2019-01-01)

Se reporta la permeabilidad y tortuosidad de cerámicas mesoporosas de caolines y diatomitas. Las muestras cilíndricas con porcentaje en peso de 60 % diatomita, 30 % caolín y 10 % CaCO3, fueron elaboradas por colado, con ...
Design and manufacture of the cooling system of JUPITER reactor

Hector Jaime, Dulce-Moreno; Gélvez Arocha, O A; Dugar-Zhabo, V D; Rodríguez-Villamiza, C D; V-Niño, E D (Journal of Physics: Conference SeriesBogota , Colombia, 2019-02-25)

The experimental investigations carried out in the Plasma laboratory of the Universidad Industrial de Santander, on superficial modification of metallic materials by hybrid discharges of high-voltage and electric arc at ...
Aplicación de FeO, ZnO y CuO como pigmentos en compuestos cerámicos

ROA BOHÓRQUEZ, KAROL LIZETH; PAREDES ROA, RICARDO ALFONSO; LARA GONZÁLEZ, LUIS ÁNGEL; Peña Rodriguez, Gabriel (Informador TécnicoBogota , Colombia, 2019-04-12)

Entre los problemas más relevantes de la industria alfarera de Boyacá, Colombia, se encuentra la ausencia de una gama de tonalidades uniformes de sus productos finales. El color, por tratarse de una propiedad física ...
Microstructure, physical and mechanical properties of kaolin - diatomite composite reinforced with CaCO3

ROA BOHÓRQUEZ, KAROL LIZETH; Vera López, Enrique; FONSECA PÁEZ, LUIS ALEJANDRO; Peña Rodriguez, Gabriel (DYNA, 2019-07-01)

The present work reports the microstructure, physical and mechanical properties of a material composed of kaolin, diatomite and calcium carbonate reinforcement (CaCO3). The ceramic prototypes were shaped by the slip casting ...
Effective thermal properties of a magnetite-polyester composite conformed in the presence of a constant magnetic field

LARA GONZÁLEZ, LUIS ÁNGEL; Peña Rodriguez, Gabriel; Pineda Triana, Yaneth (AIMS Materials ScienceWashintong D.C , Estados Unidos, 2019-07-02)

In this study, we report the thermophysical properties (at room temperature) and the morphology of a composite with a polyester resin matrix and magnetite filler powders (Fe3O4), conformed in three configurations: randomly ...
Use of recycled diatomaceous earth from breweries as a means of transporting of macronutrients

Peña Rodriguez, Gabriel; Rodriguez Aguilar, Marlon Hans; BECERRA, EVER; Caballero, Xandro; Hector Jaime, Dulce-Moreno (Revista UIS IngenieríasBogota , Colombia, 2019-09-16)

Se reporta la caracterización físico-química de tierras diatomáceas recicladas de la industria cervecera, y su uso como medio de transporte de macronutrientes (Nitrógeno, Fósforo, Potasio (NPK)), con el fin de dar una ...

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Structure, mechanical and thermal behaviour of mixtures of polyester resin and dental ceramic waste
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Peña Rodriguez, Gabriel | 2016-02-12

The tensile strength and bending strength, structure and thermal behaviour of mixtures of polyester resin (P-2000) and powders (ASTM sieve 200, <75μm) of dental ceramic wastes (dentals impressions, alginate and gypsum) was reported. The samples consisted of mixtures with percentage weights of 50-50%, 60-40%, 70-30%, 80-20%, 90-10%, where the resin was the majority phase, the Mekc (4% wt) was used as catalyst. The structure was studied using SEM and XRD, the thermal behaviour using DSC, TGA and DMA, while the mechanical strength was tested using standards ASTM D790 and D638. Irregular morphology and presence of small agglomerations was observed, with particle sizes between 29.63 and 38.67μm, the presence of different phases of calcium sulphate was found, and that to the increasing the concentration of the powder, the materials becomes more crystalline, increasing its density. An average service temperature of 69.15±4.60°C was found. Vickers hardness values are reported in ranges from 18.65 to 27.96. Considering the elastic modules was established that the materials become more rigid by having more powder concentration.

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Electrochemical characterization of the steel wire used as reinforcement in the conductors transmission networks electricity nitride by ion implantation
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Hector Jaime, Dulce-Moreno | 2016-02-12

The power company feature infrastructure, which are generally shaped so the transmission and distribution lines, here is why it is necessary to characterize the process of electrochemical corrosion of these components. In this case the steel wire coated with zinc or aluminium, as it is undergoes the rigor of corrosive environments. Given the geographical diversity and different climatic environments, atmospheric corrosion carried affecting service life of structures. For example in very humid environments such as coasts and high altitudes, wetting time (TOW), parameter that meets the conditions of temperature and relative humidity, it affects large proportion, accelerating the corrosion of ferrous materials. Given the importance of establishing mechanisms that lessen the impact on degradation in transmission and distribution lines of both the reliability and the availability of the same. This paper presents the implementation in nitride steels as an alternative or complement to zinc coating.

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Mechanical and tribological behavior of red clay ceramic tiles coated with fly ash powders by thermal spraying technique
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Peña Rodriguez, Gabriel | 2017

The mechanical and tribological performance of red clay ceramic tiles uncoated and coated by oxy-fuel thermal spraying process from fly ash powders was evaluated. The ceramic tile substrates were manufactured by uniaxial pressing at 26.17 bar pressure, and sintered at 1100 °C. The coating thickness was determined based on the number of projection-cycles oxyacetylene flame over substrate. Coal fly ash coatings were deposited, with average thickness of 56.18±12.18 μm, 180.42±20.32 μm, and 258.26±25.88μm. The mechanical resistance to bending and wear by abrasion deep, were studied using ISO 10545-4 standards and ISO 10545-6 respectively; adhesion was measured using Elcometer equipment Type III according to ASTM D-4541-02 and the average roughness (Ra) was found according to ASTM standard D7127-13, using the profilometer Mitutoyo SJ 201. The surface morphology presented the heterogeneous molten or semi molten splats with average size of 35.262±3.48 micrometers with good adhesion, justifying increased mechanical resistance to bending by 5%, as well as wear by abrasion deep. These results contribute to the development of ceramic products with added value, to be used in various technological applications.

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Effect of surface roughness on nitriding processes by dielectric barrier discharges of carbon steel
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Hector Jaime, Dulce-Moreno | 2017-12-29

Changes in the behaviour of steels to carbon, for three different finishes, surfaces were determined to be nitride by atmospheric pressure dielectric barrier discharge. The surfaces were characterized both morphologically and structurally before and after the treatment. The techniques used were: measurement of roughness and electrochemical testing (Tafel). Results show changes differential depending on the type of finish, but in any case, an improvement of corrosion resistance.

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Projection parameters for zirconia-alumina-ceria coatings made by flame spraying from results of numerical simulation
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Peña Rodriguez, Gabriel | 2017-12-29

A numerical simulation was performed with the software Jets et Poudres, the results let choose the parameters to deposit zirconia-alumina-ceria coatings of different composition on substrates of red clay, by thermal spraying with the oxyacetylene flame to obtain homogeneous coatings with good adhesion to the substrate. The effect of the projection distance (7, 10 and 12cm) between the substrate and the torch, the fusion percentage of particles and the K-Sommerfeld number was determined. This number is dimensionless and is affected by the projection distance and by the chemical composition of the particles. For a projection distance of 9cm, the fusion percentage of the particles varies between 83.8% and 100%, and the K-Sommerfeld number between 47.3 and 50 for the different compounds. This makes possible to obtain uniform coatings with good wettability, therefore, good adhesion to the substrate, while for the distance of 7cm the fusion percentage varies between 22% and 38%, due to the short time of the particles in the flame which causes low adhesion, when the projection distance is 12cm the particles do not have sufficient kinetic energy to reach the substrate and therefore the coating is not deposited.

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Wear and corrosion behaviour of Al2O3-TiO2 coatings produced by flame thermal projection
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Hector Jaime, Dulce-Moreno | 2017-12-29

Evaluated the wear resistance and the coatings corrosion behaviour of Al2O3-TiO2 prepared by thermal spraying by flame on AISI 1020 carbon steel substrates, previously coated with an alloy base Ni. For this purpose, were controlled parameters of thermal spraying and the use of powders of similar but different chemical composition is taken as a variable commercial reference for ceramic coating. SEM images allowed to know the morphology of the powders and coatings. Electrochemical techniques (Tafel) were applied to evaluate the protection against corrosion. Coatings were tested for wear with a tribometer configuration bola-disco. It was determined that the phases present in coatings are directly relate to the behaviour against corrosion and wear them. Keywords: wear, corrosion, thermal imaging.

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Optimization of the parameters for obtaining zirconiaalumina coatings, made by flame spraying from results of numerical simulation
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Peña Rodriguez, Gabriel | 2017-12-29

The K-Sommerfeld values (K) and the melting percentage (% F) obtained by numerical simulation using the Jets et Poudres software were used to find the projection parameters of zirconia-alumina coatings by thermal spraying flame, in order to obtain coatings with good morphological and structural properties to be used as thermal insulation. The experimental results show the relationship between the Sommerfeld parameter and the porosity of the zirconia-alumina coatings. It is found that the lowest porosity is obtained when the K-Sommerfeld value is close to 45 with an oxidant flame, on the contrary, when superoxidant flames are used K values are close 52, which improve wear resistance.

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ForistomApp a Web application for scientific and technological information management of Forsitom foundation
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Hector Jaime, Dulce-Moreno | 2017-12-29

Information and Communication Technologies (ICT) are essential in the transfer of knowledge, and the Web tools, as part of ICT, are important for institutions seeking greater visibility of the products developed by their researchers. For this reason, we implemented an application that allows the information management of the FORISTOM Foundation (Foundation of Researchers in Science and Technology of Materials). The application shows a detailed description, not only of all its members also of all the scientific production that they carry out, such as technological developments, research projects, articles, presentations, among others. This application can be implemented by other entities committed to the scientific dissemination and transfer of technology and knowledge.

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Elaboración y caracterización de recubimientps de polvos de ZnSCu y resinas de poliester sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes
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Ferrer, Martha | 2018

En este estudio se elaboran y caracterizan recubrimientos de polvos ZnSCu y resinas de poliéster termoestables sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes. Los recubrimientos se conforman a partir de mezclas de polvos, resina y catalizador en diferentes porcentajes. Se estudia sus propiedades en función de la concentración del polvo agregado a la mezcla. La información comparativa de las diferentes concentraciones de polvo fosforescente y resina de poliéster permiten determinar no solo su caracterización, sino también la toma de decisiones en el diseño y aplicación en futuras propuestas arquitectónicas, relacionadas con fachadas o revestimientos que absorban luz ultravioleta o solar durante el día y su fosforescencia durante la noche.

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Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster
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Peña Rodriguez, Gabriel | 2018-01-15

Se reporta el efecto de la concentración de polvos de magnetita (Fe3O4) sobre las propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster termoestable. Las muestras se elaboraron mediante el método de colado manual en concentraciones de: 60-40, 70-30, 80-20, 90-10 y 100-0 (% en peso), donde la fase mayoritaria es la resina y la minoritaria los óxidos de Fe3O4. La estructura cristalina se estudió usando la técnica de difracción de rayos X y la caracterización superficial tuvo lugar a través de la técnica de microscopía electrónica de barrido. Se midió la respuesta eléctrica por medio de curvas de polarización eléctrica en función del campo eléctrico y de resistividad eléctrica volumétrica a través de un electrómetro. La respuesta magnética se determinó mediante curvas de magnetización en función de la intensidad de campo magnético aplicado y en función de la temperatura. El análisis estructural indica que el porcentaje de cristalinidad aumenta a medida que se adiciona la concentración de Fe3O4 a las muestras. La caracterización eléctrica del material evidencia que la resistividad volumétrica disminuye con el incremento de magnetita, mostrando una transición aislante-conductor, con valores de la constante dieléctrica cada vez mayores. La caracterización magnética evidencia un aumento lineal de la magnetización de saturación y del momento magnético en función de la cantidad de magnetita adicionada a la matriz polimérica, mientras que la coercitividad evidencia comportamientos de materiales magnéticos blandos tanto en T˃TV como en T<TV, donde TV representa la temperatura de Verwey

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$Portada Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material$

Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material
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Cadavid, Edwin | 2018-04-01

A chromite mineral and two industrial residues produced in the petrochemical and thermoelectric industries, were selected, characterized, processed and deposited on refractory bricks. By means of X-ray fluorescence and X-ray diffraction the chemical composition and crystallographic phases of raw materials were analyzed, morphology and particle size was determinate using Scanning Electron Microscopy. The materials were deposit by oxyacetylene thermal spray on silica-alumina refractory bricks and high alumina low cement concrete, commercial references ER-40 and CBC-50 from ERECOS S.A.S.. The parameters used for the coating deposition were optimized based on preliminary test and simulations using the Jets&powders software. The chromite mineral coating displayed greater structure homogeneity than the other two coatings; the last ones presented partially melted particles and high porosity. However, based on the chemical composition, the response to adhesion test and the crystallographic phases present in the coatings, all of them are potential candidates to be used as protective barriers against corrosive effects on refractories.

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Water treatment using porous ceramics based on recycled diatomite and kaolin
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MOGOLLON CUELLAR, ZULMA YARLEY | 2018-09-06

The treatment of waters using filtering process through sintered porous ceramics based on diatomite and kaolin is reported. The water samples were prepared in low = 50%, medium = 100% and high = 150% concentrations, taking as reference point the maximum value allowed according to the resolution 2115 - 2007. The treated parameters were alkalinity; hardness to calcium, magnesium and total; chlorides; sulfates and total iron. The porous ceramics were formed by slip casting in plaster mold, from pastes with weight percentage of 50% recycled diatomite from the beer industry, 40% kaolin and 10% calcium carbonate. The particle sizes of the ceramic powders were the passed through ASTM 200 sieve. The drying of the ceramics was carried out at room temperature for 24 h, then by forced circulation oven Memmert UF-110 at 100 ° C for an equal time. The sintering of the ceramics was carried out in Vulcan D-130 electric muffle, at a maximum temperature of 1000 ° C for two hours, with a heating ramp of 10 ° C/min. The morphology of the ceramics was studied using scanning electron microscopy (SEM), while the physic ceramic analyses was evaluated according to ISO 10545-3 standard. Our results, reported what porous ceramics efficiency for the removal of chlorides up to 50%, while elimination of sulfates was approximately 43%, on the other hand, the total iron was removed up to 95%, likewise,it was evidenced that ceramics are not efficient in the treatment of hardness and alkalinity of waters with high concentrations

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Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin
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RIVERA, SILVIA FERNANDA | 2018-10-22

The treatment of underground wastewater is presented. Used at the San Martín 5 mine in the San Roque sector of the municipality of Sardinata (Norte de SantanderColombia); through the process of filtration through bilayer porous membrane (diatomite-kaolin / kaolin) based on recycled diatomite from the brewing industry and kaolin. The water samples were looked at before and after the filtration process, taking as reference the maximum values allowed by resolution 0631 of 2015. The analyzed parameters were Suspended solids, BOD5, COD, pH, Fe, dissolved solids. The porous cylindrical ceramics, 5 cm in diameter and 0.9 cm thick, were formed by casting using the plaster mold, where the layer of 100% kaolin with a thickness of approximately 0.3 cm was first deposited. applied the second layer from pulps with weight percentage of 50% recycled diatomite from the brewing industry, 40% kaolin, and 10% calcium carbonate. Once the ceramics are carried out, they aresubject to the drying process at room temperature for 24 hours, then by means of the forced circulation oven Memmert UF-110 at 100 ° C for an equal time. The sintering of the ceramic was carried out in Vulcan D-130 electric muffle, at a maximum temperature of 1000 ° C for two hours, with a heating ramp of 10 ° C / min. The morphology of the ceramics was studied using scanning electron microscopy (SEM), while physical-ceramic analyzes were performed in accordance with ISO 10545-3. The results show that the ceramic membrane is, in fact, 52% for the reduction of total solids, while the elimination of iron is 38%, on the other hand, it is also evident that the ceramics are not effective in the treatment of dissolved solids with high concentrations

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Porous covering compound of clay matrix and coal ashes
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Peña Rodriguez, Gabriel | 2018-11-05

Here are presented the elaboration and characterization of a composite material with an atomized ceramic paste and flying ashes product of the coal combustion. The samples consist of prismatic tiles of 10x5x1 cm, formed by uniaxial pressing at 30 bars, made for mixes with a percentage weight of 90-10, 80-20, 70-30, 60-40 and 50-50, where the majority phase corresponds to the atomized ceramic paste. The drying process was conducted at room temperature for 12 hours and then in drying oven at 110 ° C for 24 hours. The sintering was carried out in gradient electric muffle at a maximum temperature of 1150 °C. According to the porous morphology and mechanical properties found for samples, this can be used as ceramic coatings with thermal isolation qualities for edifications in tropical weather like the metropolitan area of Cucuta, North Santander (Colombia)

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Tortuosidad y permeabilidad de materiales cerámicos mesoporosos de caolín y diatomita
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FONSECA PÁEZ, LUIS ALEJANDRO | 2019-01-01

Se reporta la permeabilidad y tortuosidad de cerámicas mesoporosas de caolines y diatomitas. Las muestras cilíndricas con porcentaje en peso de 60 % diatomita, 30 % caolín y 10 % CaCO3, fueron elaboradas por colado, con diámetro promedio de 5 cm y espesor de 0,6 cm. El proceso de secado se realizó mediante estufa de circulación forzada a 100 °C por 24 horas, la sinterización a temperaturas de 800 °C, 850 °C, 900 °C, 950 °C, 1.000 °C y 1.100 °C, usando una mufla eléctrica con una rampa de 5 °C/min. Para la determinación de permeabilidad por el agua, se utilizó un permeámetro de carga variable, mientras que la tortuosidad se halló del producto del factor de forma y su porosidad. Se encontraron resultados de tortuosidad en el rango de 3,32 a 7,16, mientras que la permeabilidad varió entre 3,09x10-6 y 22,2x10-6 cm/s, evidenciándose un comportamiento inverso entre estos parámetros al incrementarse la temperatura.

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Design and manufacture of the cooling system of JUPITER reactor
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Hector Jaime, Dulce-Moreno | 2019-02-25

The experimental investigations carried out in the Plasma laboratory of the Universidad Industrial de Santander, on superficial modification of metallic materials by hybrid discharges of high-voltage and electric arc at low pressures are carried out in the joint universal plasma and ion technologies experimental reactor. The cooling system of the reactor is by water, which means that it is directly connected to the water supply line of the building, which creates a dependence on the system. Additionally, the water supply line is often filled with particles that accumulate in the cooling system, disfavoring the transfer of energy between the water, the vacuum system and the cathode, which can lead to overheating of the reactor and melt the elements that make up the electric power system. In accordance with the above, the present research work consists of designing, building and implementing an efficient cooling system totally independent from the water supply line of the building, which allows to recirculate and minimize water consumption in order to take care of the natural resource.

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Aplicación de FeO, ZnO y CuO como pigmentos en compuestos cerámicos
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ROA BOHÓRQUEZ, KAROL LIZETH | 2019-04-12

Entre los problemas más relevantes de la industria alfarera de Boyacá, Colombia, se encuentra la ausencia de una gama de tonalidades uniformes de sus productos finales. El color, por tratarse de una propiedad física fácilmente observable, se convierte en un criterio distintivo para clientes potenciales que buscan un producto diferenciador y a la vanguardia dentro de un medio en constante cambio. Por tal razón, el presente trabajo propuso un compuesto cerámico elaborado a partir de arcillas montmorillonitas y óxidos metálicos tales como FeO, CuO y ZnO. Las arcillas se caracterizaron por Fluorescencia de Rayos X (FRX) y de acuerdo a la composición química de cada arcilla, se determinaron las concentraciones de los óxidos metálicos como agentes colorantes, los cuales variaron de 1 a 8 % (en peso). Los prototipos cerámicos se conformaron por el método de prensado uniaxial a una presión de compactación constante de 15 MPa, posteriormente se sinterizaron a 950 °C durante 2 h. Mediante histogramas RGB se realizaron los análisis de color de los especímenes, los resultados mostraron cambios significativos en la pigmentación del compuesto cerámico reportando tono rojo, café y blanco. Lo anterior, hace viable la utilización de estos óxidos como pigmentos termoestables en la elaboración de productos cerámicos tales como: tejas, tabletas y baldosas, entre otros diseños cerámicos que hoy en día solo se pueden encontrar en tiendas de cerámica avanzada.

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Microstructure, physical and mechanical properties of kaolin - diatomite composite reinforced with CaCO3
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ROA BOHÓRQUEZ, KAROL LIZETH | 2019-07-01

The present work reports the microstructure, physical and mechanical properties of a material composed of kaolin, diatomite and calcium carbonate reinforcement (CaCO3). The ceramic prototypes were shaped by the slip casting method and sintered at temperatures between 800 °C and 1100 °C. The morphology and average pore size was analyzed by Scanning Electron Microscopy (SEM) and the mineralogical phases were determined by X-Ray Diffraction (XRD). The apparent density was established by the mercury immersion method according to the E – 8B Standard of the Institute of Ceramic Technology (ITC); the percentage of absorption was determined by the boiling method according to ISO 10545-3 standard; linear contraction was studied in three directions: long, wide and high. The study of the mechanical resistance to compression followed the procedure established at ASTM C773–88 standard and the breaking modulus was calculated by the three-point bending test, according to ISO 10545–4. Results show that the material structure is affected with increasing temperature reporting a decrease in quartz phase from 51.16 % to 33.81 %. Percentage of absorption revealed its most significant variation between 950 °C and 1100 °C with a decrease of 21 % approximately. Mechanical resistance values showed wide dispersion which was attributed to the different orientations in which the material failed during each test. According to the pore diameters found, the compound is characterized by being macro and mesoporous facilitating its application in catalysis, photochemistry, microelectronics and other microfiltration media

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Effective thermal properties of a magnetite-polyester composite conformed in the presence of a constant magnetic field
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LARA GONZÁLEZ, LUIS ÁNGEL | 2019-07-02

In this study, we report the thermophysical properties (at room temperature) and the morphology of a composite with a polyester resin matrix and magnetite filler powders (Fe3O4), conformed in three configurations: randomly dispersed particles, particles oriented parallel to a constant 300 mT magnetic field, and particles oriented perpendicular to a constant 300 mT magnetic field. Samples were formed by hand lay-up with weight percentages of 10, 20 and 30%, where the highest concentration corresponds to the resin. The thermophysical properties were determined using the KD2 Pro® system, which uses the physical principle of linear transient heat flow, for which the dual sensor SH-1 was used. The morphology and microanalysis were studied using a scanning electron microscope (SEM, FEI Quanta 650 FEG). It was observed from the morphology that the magnetite particles are oriented in the direction of the magnetic field lines during the process of resin curing. It was also perceived that the values of the thermophysical properties found experimentally are within the limits (upper and lower) of Hashin and Shtrikman and that those values increase when the magnetite concentration increases in the sample. No significant difference was observed in the thermal properties because of the magnetic field applied.

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Use of recycled diatomaceous earth from breweries as a means of transporting of macronutrients
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Peña Rodriguez, Gabriel | 2019-09-16

Se reporta la caracterización físico-química de tierras diatomáceas recicladas de la industria cervecera, y su uso como medio de transporte de macronutrientes (Nitrógeno, Fósforo, Potasio (NPK)), con el fin de dar una alternativa amigable con el ambiente, a los desechos generados en el subproceso de filtración de la cerveza. Para la conformación de las muestras (pellets) por extrusión, se utilizó como aglutinantes carboximetilcelulosa (CMC) y fécula de maíz, mientras que la humectación se llevó a cabo usando una solución líquida comercial con 15 % de NPK, en concentración baja, media y alta, la cual se agregó durante el proceso de conformado de los pellets. La caracterización química de las muestras se realizó usando espectroscopía de absorción atómica (AA), y microanálisis mediante espectroscopia de energías dispersas (EDS), la morfología superficial se estudió usando microscopia electrónica de barrido (MEB). El comportamiento de la capacidad de devolución de los macronutrientes a un medio acuoso se llevó a cabo por medio del análisis de la conductividad eléctrica (EC) y sólidos totales disueltos (TDS) en función del tiempo mediante el multiparámetro SI Analytics 680 K. Se encontró que la muestra que no presentó pérdida de su estructura en medio acuoso fue la conformada por 60% de diatomita, 10% de CMC y 30% de fécula de maíz (%w/w). También se evidenció un incremento en el tiempo de la EC y TDS de la solución acuosa cuando se sumergían los pellets activados, infiriéndose que éstos son un buen medio se trasporte de macronutrientes, los cuales podrán ser usados como abono en aplicaciones agrícolas coadyuvando al medio ambiente

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Structure, mechanical and thermal behaviour of mixtures of polyester resin and dental ceramic waste ﻿

Electrochemical characterization of the steel wire used as reinforcement in the conductors transmission networks electricity nitride by ion implantation ﻿

Mechanical and tribological behavior of red clay ceramic tiles coated with fly ash powders by thermal spraying technique ﻿

Effect of surface roughness on nitriding processes by dielectric barrier discharges of carbon steel ﻿

Projection parameters for zirconia-alumina-ceria coatings made by flame spraying from results of numerical simulation ﻿

Wear and corrosion behaviour of Al2O3-TiO2 coatings produced by flame thermal projection ﻿

Optimization of the parameters for obtaining zirconiaalumina coatings, made by flame spraying from results of numerical simulation ﻿

ForistomApp a Web application for scientific and technological information management of Forsitom foundation ﻿

Elaboración y caracterización de recubimientps de polvos de ZnSCu y resinas de poliester sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes ﻿

Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster ﻿

Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material ﻿

Water treatment using porous ceramics based on recycled diatomite and kaolin ﻿

Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin ﻿

Porous covering compound of clay matrix and coal ashes ﻿

Tortuosidad y permeabilidad de materiales cerámicos mesoporosos de caolín y diatomita ﻿

Design and manufacture of the cooling system of JUPITER reactor ﻿

Aplicación de FeO, ZnO y CuO como pigmentos en compuestos cerámicos ﻿

Microstructure, physical and mechanical properties of kaolin - diatomite composite reinforced with CaCO3 ﻿

Effective thermal properties of a magnetite-polyester composite conformed in the presence of a constant magnetic field ﻿

Use of recycled diatomaceous earth from breweries as a means of transporting of macronutrients ﻿

Envíos recientes

Structure, mechanical and thermal behaviour of mixtures of polyester resin and dental ceramic waste

Electrochemical characterization of the steel wire used as reinforcement in the conductors transmission networks electricity nitride by ion implantation

Mechanical and tribological behavior of red clay ceramic tiles coated with fly ash powders by thermal spraying technique

Effect of surface roughness on nitriding processes by dielectric barrier discharges of carbon steel

Projection parameters for zirconia-alumina-ceria coatings made by flame spraying from results of numerical simulation

Wear and corrosion behaviour of Al2O3-TiO2 coatings produced by flame thermal projection

Optimization of the parameters for obtaining zirconiaalumina coatings, made by flame spraying from results of numerical simulation

ForistomApp a Web application for scientific and technological information management of Forsitom foundation

Elaboración y caracterización de recubimientps de polvos de ZnSCu y resinas de poliester sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes

Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster

Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material

Water treatment using porous ceramics based on recycled diatomite and kaolin

Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin

Porous covering compound of clay matrix and coal ashes

Tortuosidad y permeabilidad de materiales cerámicos mesoporosos de caolín y diatomita

Design and manufacture of the cooling system of JUPITER reactor

Aplicación de FeO, ZnO y CuO como pigmentos en compuestos cerámicos

Microstructure, physical and mechanical properties of kaolin - diatomite composite reinforced with CaCO3

Effective thermal properties of a magnetite-polyester composite conformed in the presence of a constant magnetic field

Use of recycled diatomaceous earth from breweries as a means of transporting of macronutrients

Portales Institucionales

Structure, mechanical and thermal behaviour of mixtures of polyester resin and dental ceramic waste

Electrochemical characterization of the steel wire used as reinforcement in the conductors transmission networks electricity nitride by ion implantation

Mechanical and tribological behavior of red clay ceramic tiles coated with fly ash powders by thermal spraying technique

Effect of surface roughness on nitriding processes by dielectric barrier discharges of carbon steel

Projection parameters for zirconia-alumina-ceria coatings made by flame spraying from results of numerical simulation

Wear and corrosion behaviour of Al2O3-TiO2 coatings produced by flame thermal projection

Optimization of the parameters for obtaining zirconiaalumina coatings, made by flame spraying from results of numerical simulation

ForistomApp a Web application for scientific and technological information management of Forsitom foundation

Elaboración y caracterización de recubimientps de polvos de ZnSCu y resinas de poliester sobre sustratos cerámicos de arcilla roja, para el diseño de fachadas y revestimientos arquitectónicos fosforescentes

Efecto de la concentración de magnetita en la estructura, propiedades eléctricas y magnéticas de un material compuesto a base de resina de poliéster

Manufacture of oxy-acetylene thermally sprayed coating on refractory subtrates from unconventional feedstock material

Water treatment using porous ceramics based on recycled diatomite and kaolin

Treatment of subterranean mining water through filtration using ceramic bilayer membranes based of recycled diatomites and kaolin

Porous covering compound of clay matrix and coal ashes

Tortuosidad y permeabilidad de materiales cerámicos mesoporosos de caolín y diatomita

Design and manufacture of the cooling system of JUPITER reactor

Aplicación de FeO, ZnO y CuO como pigmentos en compuestos cerámicos

Microstructure, physical and mechanical properties of kaolin - diatomite composite reinforced with CaCO3

Effective thermal properties of a magnetite-polyester composite conformed in the presence of a constant magnetic field

Use of recycled diatomaceous earth from breweries as a means of transporting of macronutrients