Mostrando ítems 1-6 de 6

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel

Bautista-Ruiz, Jorge; William Alexander, Bautista Ruiz; Aperador Chaparro, William Arnulfo (Journal of Physics: Conference SeriesInglaterra, 2020-12)

Currently, aircraft wings made of AA2024 T3 aluminum are primed between the aluminum substrate and the outer layer of paint to improve the material's adhesion and corrosion resistance. This type of primer contains chromates ...
Characterization of bismuth-silicate soles

Bautista-Ruiz, Jorge; Aperador Chaparro, William Arnulfo; Bautista, W (Journal of Physics: Conference SeriesInglaterra, 2019-11-29)

The bismuth silicate compound was synthesized by the sol-gel method from bismuth nitrate pentahydrate and tetraethoxysilane, as precursors. The sol-gel method is attractive because the processes for obtaining oxides are ...
Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method

Bautista-Ruiz, Jorge; Sanchez Molina, Jorge; Aperador Chaparro, William Arnulfo (Journal of Physics: Conference SeriesInglaterra, 2019-11-29)

Sol-gel synthesis has been used since 1950 to prepare oxides. The method is attractive because the processes of obtaining the oxides are developed at room temperature; products with high purity and homogeneity are obtained, ...
Effect of the number of layers on surface topography of bismuth-titanium coatings

Garzón, P; Aperador Chaparro, William Arnulfo; Bautista-Ruiz, Jorge (Journal of Physics: Conference SeriesInglaterra, 2019-11-29)

The objective of this research is to perform a topographic characterization by atomic force microscopy of the surface of bismuth titanate (Bi/Ti) coatings varying the number of layers deposited on the substrates, considering ...
Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates

Aperador Chaparro, William Arnulfo; Bautista-Ruiz, Jorge; Garzon, P (Journal of Physics: Conference SeriesInglaterra, 2019-11)

Steels are part of the basic equipment of most of the industrial framework, including very diverse sectors such as the oil, chemical and automotive industries. However, steels are susceptible to wear phenomena limiting ...
Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium

Bautista-Ruiz, Jorge; Aperador Chaparro, William Arnulfo; Caicedo, J.C. (Tribology in IndustrySerbia, 2018)

Studies of materials in biomedical applications have focused on the generation of new biomaterials and the development of surface modifications, mainly of metals. Amorphous silicon containing diamond like carbon DLC-Si ...

Envíos recientes

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel
...
Bautista-Ruiz, Jorge | 2020-12

Currently, aircraft wings made of AA2024 T3 aluminum are primed between the aluminum substrate and the outer layer of paint to improve the material's adhesion and corrosion resistance. This type of primer contains chromates whose treatment generates highly toxic hexavalent chromium. This work studied the effect of applying dip-coating coatings of combined silicon, titanium, and zirconium oxides on AA2024 T3 aluminum substrates synthesized via sol-gel. The influence of the number of layers on the substrates anti-corrosive behavior in a 3% NaCl solution was studied using electrochemical impedance spectroscopy techniques and potentiodynamic polarization curves. The substrates corrosion resistance was found to improve substantially concerning the number of layers deposited.

LEER
Characterization of bismuth-silicate soles
...
Bautista-Ruiz, Jorge | 2019-11-29

The bismuth silicate compound was synthesized by the sol-gel method from bismuth nitrate pentahydrate and tetraethoxysilane, as precursors. The sol-gel method is attractive because the processes for obtaining oxides are developed at room temperature. In addition, it allows precise control over the composition, homogeneity, and deposition of coatings. The impact of bone-related diseases and trauma has increased significantly, in recent decades in developed and developing countries. There are materials such as bioactive glasses, especially silica compounds, which are called to play a very important role in this area, due to properties such as osteoconductivity, osteoproduction, and osteoinduction. For 20 years, the sol-gel method and the supramolecular chemistry of surfactants have been incorporated into the field of bioceramics, which allows the control, on a nanometric scale, of porosity in bioglasses. The sol-gel method has allowed obtaining bioactive materials with high surface area and high porosity. The study consisted of shaping soles by varying the molar concentrations of tetraethoxysilane and assessing the effect on aging, viscosity, determining the presence of specific functional groups and establishing the transformations that take place as a function of temperature. The results allowed characterizing each of the sol for possible application in bioglasses.

LEER
Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method
...
Bautista-Ruiz, Jorge | 2019-11-29

Sol-gel synthesis has been used since 1950 to prepare oxides. The method is attractive because the processes of obtaining the oxides are developed at room temperature; products with high purity and homogeneity are obtained, and allow the combination of several types of oxides: silicon, zirconium, titanium, aluminum, bismuth, and cerium. Sol-gel has been used to make ceramic composites with anticorrosive properties on stainless steel substrates. A class of stainless steel widely used in biomedical applications, especially in the treatment of fractures, 316L is its low economic cost relative to other materials such as titanium. Once the steel implant is inside the human body it comes into contact with body fluids that contain chloride ions. The fluid-implant interaction develops a corrosive process on the metal surface. The corrosive products of iron diffuse in the body causing tissue damage. As a possible solution to this problem, the objective of the investigation was to obtain a bismuth-titanium oxide using the sol-gel method and apply it on 316L stainless steel substrates. Bismuth nitrate pentahydrate and titanium tetrabutoxide were used as precursors. The anticorrosive response was evaluated in a simulated physiological solution, Ringer's solution, by electrochemical impedance spectroscopy and potentiodynamic polarization curves. It is concluded that the coatings function as a corrosion barrier preventing the chloride ions Ringer's solution reach the metal surface.

LEER
Effect of the number of layers on surface topography of bismuth-titanium coatings
...
Garzón, P | 2019-11-29

The objective of this research is to perform a topographic characterization by atomic force microscopy of the surface of bismuth titanate (Bi/Ti) coatings varying the number of layers deposited on the substrates, considering that there were not results of reported studies in which these precursors were used. It is important to analyze the surface behavior of these coatings as a first phase of future researches to establish the viability of possible uses and applications in biomedical industry. The films were synthesized by the sol-gel method from bismuth nitrate pentahydrate and titanium tetrabutoxide. Subsequently, by means of the spin- coating technique, the coatings were deposited on 316L stainless steel in monolayer and bi- layer, as this type of steel has been widely used for medical applications due to its good compatibility. The roughness values of each of the coatings were also determined. It is concluded that there is a relationship between the topography of the surface and the roughness values of the films with respect to the concentration of the precursors, the number and the speed of centrifugation of the layers deposited on the substrate. High concentrations of titanium tetrabutoxide effect on the good densification characteristics of the coatings.

LEER
Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates
...
Aperador Chaparro, William Arnulfo | 2019-11

Steels are part of the basic equipment of most of the industrial framework, including very diverse sectors such as the oil, chemical and automotive industries. However, steels are susceptible to wear phenomena limiting their life in use and losing efficiency in the applications to which it is intended leading to a technological and economic problem. In mechanical systems, lubrication requires effective strategies to ensure that the increase in critical contact voltages does not cause material failure during operation. Although there are different ways to avoid the wear of steel parts, the development of material technology has allowed the manufacture of new alloys with anti-wear properties. Replacing steels with other higher cost materials is very unfeasible. For this reason, one of the alternatives of greatest interest to reduce wear is based on the surface modification of the metal through the use of coatings. The sol-gel method allows the manufacture of coatings on steel parts to reduce wear. The objective of this work was to manufacture, using sol-gel, bismuth-titanium coatings on 316 L stainless steel substrates in order to analyze the mechanical wear of the system and evaluate its wear rates and friction coefficients. The study focused on determining the effect of precursor concentration on performance as a film to reduce wear. It was determined that the friction coefficients show significant variations due to adhesive wear processes. With respect to wear, it is concluded that the coatings offer substrate protection by indicating wear rates lower than those reported for 316 L stainless steel substrates without coating.

LEER
Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium
...
Bautista-Ruiz, Jorge | 2018

Studies of materials in biomedical applications have focused on the generation of new biomaterials and the development of surface modifications, mainly of metals. Amorphous silicon containing diamond like carbon DLC-Si coating deposited on titanium substrate with the purpose of studying its biofunctionality. The behavior against the phenomenon of tribocorrosion of coatings DLC-Si deposited on titanium was evaluated, through the plasma-assisted chemical vapor deposition technique. The nanoindentation technique was used to determine the coating mechanical properties. The DLC-Si coatings were structurally analyzed through X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques, the characteristic binding energy for the signal C1s was obtained from XPS. Via XRD results the amorphous structure of DLC-Si coating was determined. The triboelectrochemical results indicate that the coating shows an adequate wear and to corrosion protection when exposed to the synergic mechanism, thus demonstrating the protective coating effect

LEER

‹›

Repositorio Digital

Listar por autor "Aperador Chaparro, William Arnulfo"

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel

Characterization of bismuth-silicate soles

Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method

Effect of the number of layers on surface topography of bismuth-titanium coatings

Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates

Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium

Envíos recientes

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel

Characterization of bismuth-silicate soles

Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method

Effect of the number of layers on surface topography of bismuth-titanium coatings

Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates

Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium

Portales Institucionales

Enlaces de Interés

Contactos

Listar por autor "Aperador Chaparro, William Arnulfo"

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel ﻿

Characterization of bismuth-silicate soles ﻿

Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method ﻿

Effect of the number of layers on surface topography of bismuth-titanium coatings ﻿

Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates ﻿

Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium ﻿

Envíos recientes

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel

Characterization of bismuth-silicate soles

Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method

Effect of the number of layers on surface topography of bismuth-titanium coatings

Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates

Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium

Portales Institucionales

Anti-corrosive characterization of silicon, titanium, and zirconium oxide coatings deposited on aeronautical aluminum substrates via sol-gel

Characterization of bismuth-silicate soles

Characterization of the anticorrosive properties in bismuth-titanate films obtained by the sol-gel method

Effect of the number of layers on surface topography of bismuth-titanium coatings

Evaluation of mechanical wear in bismuth-titanium coatings synthesized by the sol-gel method and applied on 316 L stainless steel substrates

Tribocorrosion Behavior of Amorphous Carbon-Silicon Coated Titanium in Biological Medium