Mostrando ítems 1-8 de 8

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

Bautista-Ruiz, Jorge; Olaya-Flórez, Jhon Jairo; Aperador Chaparro, William Arnulfo (Revista Facultad de IngenieríaColombia, 2017-09-25)

Bismuth silicate, (BSO) thin films have been fabricated by sol–gel process. The stable sol was synthesized by using bismuth nitrate (III) pentahydrate and tetraethyl orthosilicate (TEOS). The films were deposited by ...
Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel

Bautista-Ruiz, Jorge; Aperador Chaparro, William Arnulfo; Olaya Flórez, J (Journal of Physics: Conference SeriesEstados Unidos, 2016-02-12)

BixSiyOz type coatings via sol-gel synthesized from bismuth nitrate pentahydrate, and tetraethyl orthosilicate as precursors; glacial acetic acid and 2-ethoxyethanol as solvents, and ethanolamine as complexing. The coatings ...
Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering

Olaya, Jhon; Macias Ramirez, Hugo Alejandro; Aperador Chaparro, William Arnulfo; Yate, L; L.E, Coy (Applied Surface ScienceBogota , Colombia, 2018-10-31)

We investigate the deposition of TiWSiNx thin films by means of the method of reactive magnetron co-sputtering, setting the nitrogen flow ratios N2/(Ar + N2) at 4.8%, 9.1%,16.7 and 33.3%. The crystallographic structure of ...
Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings

Aperador Chaparro, William Arnulfo; Bautista-Ruiz, Jorge; Sanchez Molina, Jorge (Metals, 2023-04-21)

For industrial processes in which refractory metals are necessary, hafnium carbonitride exhibits excellent performance due to its high thermal conductivity and resistance to oxidation. In this study, hafnium carbonitride ...
Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method

Bautista-Ruiz, Jorge; Aperador Chaparro, William Arnulfo; Caballero Gómez, J (Journal of Physics: Conference SeriesEstados Unidos, 2016-02-12)

The medical science and the engineering, work to improve the materials used in the manufacture of joint implants, since they have a direct impact on the quality of people life. The surgical interventions are increasing ...
Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers

Aperador Chaparro, William Arnulfo; Bautista-Ruiz, Jorge; Sanchez Molina, Jorge (Sustainability (Switzerland), 2023-08-15)

At present, the conservation of the environment represents an objective that everyone wants to achieve. The construction industry has influenced the advancement of alternative materials that comply with sustainable ...
Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel

Aperador Chaparro, William Arnulfo; Bautista-Ruiz, Jorge; Caicedo, J. C. (Indian Journal of Science and TechnologyNueva Delhi, 2018-05)

Objectives: This study was carried out in order to establish the potential offered by the sol-gel method to obtain Titanium/ Bismuth oxide coatings on 316L Stainless Steel (SS) substrates in biocompatibility applications. ...
Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed

Bautista-Ruiz, Jorge; Aperador Chaparro, William Arnulfo; Sanchez Molina, Jorge (Lubricants, 2023-02-21)

The applications projected in the coatings are in implants with the lower extremities since they require a great load capacity and are essential for walking. Therefore, the use of devices or implants is necessary for ...

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Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process
...
Bautista-Ruiz, Jorge | 2017-09-25

Bismuth silicate, (BSO) thin films have been fabricated by sol–gel process. The stable sol was synthesized by using bismuth nitrate (III) pentahydrate and tetraethyl orthosilicate (TEOS). The films were deposited by spin-coating at 1500 rpm on Stainless Steel 316L. The films were characterized by Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) besides the measured of the films thickness. This study aimed to evaluate the cell adhesion and cellular proliferation of osteoblast cells on BSO thin films and substrate 316L by MTT assay. It is concluded that the growth of osteoblasts is homogeneous in the surface of the coatings indicating that the medium offered by the films does not present active cytotoxicity and exceed in large number the level of cellular growth compared to Stainless Steel

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Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel
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Bautista-Ruiz, Jorge | 2016-02-12

BixSiyOz type coatings via sol-gel synthesized from bismuth nitrate pentahydrate, and tetraethyl orthosilicate as precursors; glacial acetic acid and 2-ethoxyethanol as solvents, and ethanolamine as complexing. The coatings were supported on AISI 316L stainless steel substrate through dip-coating and spin-coating techniques. The study showed that the spin-coating technique is efficient than dip-coating because it allows more dense and homogeneous films.

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Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering
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Olaya, Jhon | 2018-10-31

We investigate the deposition of TiWSiNx thin films by means of the method of reactive magnetron co-sputtering, setting the nitrogen flow ratios N2/(Ar + N2) at 4.8%, 9.1%,16.7 and 33.3%. The crystallographic structure of the films was established through X-ray diffraction (XRD), the morphology and topography were evaluated through scanning electron microscopy (SEM) and atomic force microscopy (AFM), the chemical composition was evaluated through X-ray diffraction and X-ray photoelectron spectroscopy, the mechanical properties were evaluated by nanoindentation, and the wear resistance was studied via nanowear and pin-on-disk. It was found that films deposited between 4.8% and 16.7% nitrogen flow ratio exhibited an amorphous phase. As the nitrogen was increased, the films evolved into a mixture of amorphous Si3N4 and crystalline TiWN phase. Moreover, the film morphology changed to fine columnar as the nitrogen flow ratio increased. As a general observation, the hardness, resistance to plastic deformation (H3/E2), and residual stress of the samples increased as the nitrogen flow ratio increased. The maximum hardness, resistance to plastic deformation, and residual stress were 22 ± 0.4 GPa, 213 ± 20 MPa, and 1.4 ± 0.01, respectively. The lowest nanowear volume (0.47 µm3) and wear rate (11 ± 8 10−9 mm3/N mm) were obtained for films deposited at high nitrogen flow ratios. The lowest friction coefficient (0.15) was recorded for films deposited at 16.7% nitrogen flow ratio.

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Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings
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Aperador Chaparro, William Arnulfo | 2023-04-21

For industrial processes in which refractory metals are necessary, hafnium carbonitride exhibits excellent performance due to its high thermal conductivity and resistance to oxidation. In this study, hafnium carbonitride was deposited on Inconel 718 steel and silicon (100) substrates. The objective was to characterize the wear properties as a function of temperature. The layers were deposited by physical vapor deposition (PVD) in an R.F. sputtering magnetron system from carbon targets and high-purity hafnium (99.99%). The wear tests were carried out at temperatures of 100 ◦C, 200 ◦C, 400 ◦C, and 800 ◦C in non-lubricated conditions. The coefficient of friction (COF) was recorded in situ. The heat treatment temperature on coatings is essential in determining anti-wear efficiency. It was determined that high temperatures (800 ◦C) improve resistance to wear. High-resolution XPS spectra were used to detect the chemical states of Hf 4f5/2 and Hf 4f7/2. The 4f5/2 and 4f7/2 binding energy indicates the presence of HfN and HfC. Using the TEM technique in bright field mode allowed us to know the orientation, crystallographic structure and interplanar distances of the HfCN. The topography of the coatings, by AFM, shows uniform grains and very small characteristics that determine the low surface roughness value. The SEM image of the cross-section of the HfCN coating shows homogeneity of the layer; no cracks or deformations are observed.

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Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method
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Bautista-Ruiz, Jorge | 2016-02-12

The medical science and the engineering, work to improve the materials used in the manufacture of joint implants, since they have a direct impact on the quality of people life. The surgical interventions are increasing worldwide with a high probability of a second or even a third intervention. Around these circumstances, it was evaluated the behaviour against microabrasion-corrosion phenomena on SiO2 TiO2 ZrO2 coatings, synthesized by the sol-gel method with concentration of the Si/Ti/Zr precursors: 10/70/20 and 10/20/70. The coatings were deposited on AISI 316 LVM stainless steel substrates. The morphological characterization of the wear was made by AFM techniques. It was observed that the coatings with higher levels of titanium have a good response to the phenomena of microabrasion-corrosion.

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Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers
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Aperador Chaparro, William Arnulfo | 2023-08-15

At present, the conservation of the environment represents an objective that everyone wants to achieve. The construction industry has influenced the advancement of alternative materials that comply with sustainable development. In this article, reinforced concrete was obtained by mixing 80% blast furnace slag and 20% fly ash. These concentrations were chosen because they provide the lowest porosity in the cementitious matrix. Rice husk ash was used as an activator. Guadua angustifolia fibers were used to evaluate the mechanical performance of the concrete. The composition of the raw material was determined by X-ray fluorescence, the microstructure of the fibers by AFM, and the SEM technique was used to determine the surface characteristics of guadua fibers and concrete mixes. The structural characterization using XRD, the structure of the molecules of the guadua fiber, and the composition of the mixture’s molecular mixtures were determined by FTIR spectroscopy. Its properties, such as tensile strength and flexural strength, were analyzed. The results indicated that the concrete with the addition of Guadua angustifolia fibers. The results indicated that the concrete with the addition of guadua angustifolia fibers showed the best mechanical behavior. Tensile strength was optimized, establishing values of 2.68 MPa for unreinforced concrete and up to 3.12 MPa for fiber-reinforced concrete. The flexural strength values increase at ages after 28 days due to the pozzolanic reaction generated. Values of 2.8 MPa were obtained for concrete without fiber and 3.5 MPa for concrete reinforced with guadua angustifolia fiber.

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Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel
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Aperador Chaparro, William Arnulfo | 2018-05

Objectives: This study was carried out in order to establish the potential offered by the sol-gel method to obtain Titanium/ Bismuth oxide coatings on 316L Stainless Steel (SS) substrates in biocompatibility applications. Methods/Analysis: The stable sol was synthesized by using Bismuth nitrate (III) pentahydrate and Titanium (IV) butoxide. The coatings were deposited by spin-coating technique at 4000 rpm and characterized topographically by Scanning Electron Microscopy SEM and structurally by X-ray diffraction XRD. Through the techniques of polarization potentiodynamic curves and Electrochemical Impedance Spectroscopy (EIS), the anticorrosive response of the �ilms was evaluated. The thickness was then measured, and biocompatibility test was developed. Findings: It was found that the coatings with high composition of the precursor titanium (IV) butoxide offer the best results as an anticorrosive application. Likewise, the growth of cells was uniform on the �ilms indicating that the medium offered by the �ilms does not present active cytotoxicity and surpasses by a large number the cellular growth level compared to stainless steel. Applications /Improvement: 316L (SS) is very useful in implantology, for its low cost compared with other materials. The implanted steel suffers corrosion by the physiological �luids of body. Titanium/Bismuth coatings establish a barrier between body �luids and SS implant.

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Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed
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Bautista-Ruiz, Jorge | 2023-02-21

The applications projected in the coatings are in implants with the lower extremities since they require a great load capacity and are essential for walking. Therefore, the use of devices or implants is necessary for recovery, osteosynthesis, and fixation. The tribocorrosive behavior of nanostructured compounds based on titanium oxide with an intermediate layer of gold deposited on titanium substrates was determined. These coatings were obtained using the reactive magnetron sputtering technique. Tribocorrosive properties were evaluated at sliding speeds of 3500 mm/min, 4500 mm/min, 6000 mm/min, 7500 mm/min, and 9000 mm/min with loads of 1 N, 2 N, 3 N, 4 N, and 5 N. The coatings were characterized by X-ray photoemission spectroscopy and X-ray diffraction, and the surface roughness was analyzed by atomic force microscopy. The dual mechanical and electrochemical wear tests were carried out with a potentiostat coupled to a pin on the disk system. The system was in contact with a hanks solution (37 ◦C), which acted as a lubricant. Structural characterization made it possible to identify the TiO2 compound. In the morphological characterization, it was found that the substrate influenced the surface properties of the coatings. The tribological behavior estimated by the wear rates showed less wear at higher load and sliding speeds. It was shown that it is possible to obtain coatings with better electrochemical and tribological performance by controlling the applied load and slip speed variables. In this study, a significant decrease corresponding to 64% was obtained, specifically in the speed of deterioration, and especially for a load of 5 N, depending on the sliding speed that went from 0.2831 mpy (Mils penetration per year) to 3500 mm/min compared to 0.1045 mpy at 9000 mm/min, which is explained by the mechanical blockage induced by the coating.

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Listar Tecnología Cerámica – GITEC por autor "d0ab25696c12a7e94a910bc7647be528"

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel

Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering

Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings

Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method

Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers

Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel

Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed

Envíos recientes

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel

Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering

Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings

Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method

Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers

Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel

Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed

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Listar Tecnología Cerámica – GITEC por autor "d0ab25696c12a7e94a910bc7647be528"

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process ﻿

Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel ﻿

Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering ﻿

Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings ﻿

Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method ﻿

Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers ﻿

Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel ﻿

Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed ﻿

Envíos recientes

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel

Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering

Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings

Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method

Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers

Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel

Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed

Portales Institucionales

Biocompatibility of bismuth silicate coatings deposited on 316L stainless steel by sol-gel process

Effect of forming technique BixSiyOz coatings obtained by solgel and supported on 316L stainless steel

Effect of nitrogen flow ratio on microstructure, mechanical and tribological properties of TiWSiN x thin film deposited by magnetron co-sputtering

Effect of Temperature on the Tribological Properties of Hafnium Carbonitrides Coatings

Evaluation of micro-abrasion-corrosion on SiO2-TiO2-ZrO2 coatings synthesized by the sol-gel method

Geopolymers Based on a Mixture of Steel Slag and Fly Ash, Activated with Rice Husks and Reinforced with Guadua angustifolia Fibers

Sol-Gel Synthesis of Titanium/Bismuth Oxide Coatings for Biocompatibility Applications on 316L Stainless Steel

Tribocorrosion-Resistant Surface for TiO2 as a Function of Load and Sliding Speed