The Experts below are selected from a list of 24357 Experts worldwide ranked by ideXlab platform
M. Monshi - One of the best experts on this subject based on the ideXlab platform.
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interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on ti 6al 4v in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
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Interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on Ti–6Al–4V in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
Nerilso Bocchi - One of the best experts on this subject based on the ideXlab platform.
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Preparation and characterization of biomimetically and electrochemically deposited hydroxyapatite coatings on micro-arc oxidized Ti–13Nb–13Zr
Journal of Materials Science: Materials in Medicine, 2011Co-Authors: Laís T. Duarte, Sonia R. Biaggio, Romeu C. Rocha-filho, Nerilso BocchiAbstract:Surface properties and corrosion resistance analyses of Ti–13Nb–13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. Both the biomimetic and the electrochemical method yielded rough and globular apatite surfaces (10–20 μm globules for the former and 1–2 μm for the latter). As inferred from XRD data, the electrochemical method yielded more biologic-like HA films, while the biomimetic method yielded films containing a mixture of calcium phosphate phases. Coated Ti–13Nb–13Zr samples were immersed in an aerated PBS Solution and continuously analyzed during 49 days. Considering that, after immersion, the biomimetically deposited films presented smaller variations in thickness and morphology and higher electric resistance (determined by electrochemical impedance spectroscopy), they clearly provide significantly better protection to the Ti–13Nb–13Zr alloy when in PBS Solution.
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Preparation and characterization of biomimetically and electrochemically deposited hydroxyapatite coatings on micro-arc oxidized Ti-13Nb-13Zr.
Journal of Materials Science: Materials in Medicine, 2011Co-Authors: Laís T. Duarte, Sonia R. Biaggio, Romeu C. Rocha-filho, Nerilso BocchiAbstract:Surface properties and corrosion resistance analyses of Ti–13Nb–13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. Both the biomimetic and the electrochemical method yielded rough and globular apatite surfaces (10–20 μm globules for the former and 1–2 μm for the latter). As inferred from XRD data, the electrochemical method yielded more biologic-like HA films, while the biomimetic method yielded films containing a mixture of calcium phosphate phases. Coated Ti–13Nb–13Zr samples were immersed in an aerated PBS Solution and continuously analyzed during 49 days. Considering that, after immersion, the biomimetically deposited films presented smaller variations in thickness and morphology and higher electric resistance (determined by electrochemical impedance spectroscopy), they clearly provide significantly better protection to the Ti–13Nb–13Zr alloy when in PBS Solution.
R. Yazdi - One of the best experts on this subject based on the ideXlab platform.
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interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on ti 6al 4v in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
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Interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on Ti–6Al–4V in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
Laís T. Duarte - One of the best experts on this subject based on the ideXlab platform.
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Preparation and characterization of biomimetically and electrochemically deposited hydroxyapatite coatings on micro-arc oxidized Ti–13Nb–13Zr
Journal of Materials Science: Materials in Medicine, 2011Co-Authors: Laís T. Duarte, Sonia R. Biaggio, Romeu C. Rocha-filho, Nerilso BocchiAbstract:Surface properties and corrosion resistance analyses of Ti–13Nb–13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. Both the biomimetic and the electrochemical method yielded rough and globular apatite surfaces (10–20 μm globules for the former and 1–2 μm for the latter). As inferred from XRD data, the electrochemical method yielded more biologic-like HA films, while the biomimetic method yielded films containing a mixture of calcium phosphate phases. Coated Ti–13Nb–13Zr samples were immersed in an aerated PBS Solution and continuously analyzed during 49 days. Considering that, after immersion, the biomimetically deposited films presented smaller variations in thickness and morphology and higher electric resistance (determined by electrochemical impedance spectroscopy), they clearly provide significantly better protection to the Ti–13Nb–13Zr alloy when in PBS Solution.
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Preparation and characterization of biomimetically and electrochemically deposited hydroxyapatite coatings on micro-arc oxidized Ti-13Nb-13Zr.
Journal of Materials Science: Materials in Medicine, 2011Co-Authors: Laís T. Duarte, Sonia R. Biaggio, Romeu C. Rocha-filho, Nerilso BocchiAbstract:Surface properties and corrosion resistance analyses of Ti–13Nb–13Zr coated by an oxide film (obtained by micro-arc oxidation at 300 V) or an oxide/hydroxyapatite (HA) film are reported. HA films were biomimetically or electrochemically deposited on the alloy/oxide surface, and their properties compared. Both the biomimetic and the electrochemical method yielded rough and globular apatite surfaces (10–20 μm globules for the former and 1–2 μm for the latter). As inferred from XRD data, the electrochemical method yielded more biologic-like HA films, while the biomimetic method yielded films containing a mixture of calcium phosphate phases. Coated Ti–13Nb–13Zr samples were immersed in an aerated PBS Solution and continuously analyzed during 49 days. Considering that, after immersion, the biomimetically deposited films presented smaller variations in thickness and morphology and higher electric resistance (determined by electrochemical impedance spectroscopy), they clearly provide significantly better protection to the Ti–13Nb–13Zr alloy when in PBS Solution.
H. M. Ghasemi - One of the best experts on this subject based on the ideXlab platform.
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interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on ti 6al 4v in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
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Interplay between mechanical wear and electrochemical corrosion during tribocorrosion of oxygen diffusion layer on Ti–6Al–4V in PBS Solution
Applied Surface Science, 2020Co-Authors: R. Yazdi, H. M. Ghasemi, M. Abedini, M. MonshiAbstract:Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) Solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.
