The Experts below are selected from a list of 55302 Experts worldwide ranked by ideXlab platform
Zhufang Yang - One of the best experts on this subject based on the ideXlab platform.
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Corrosion damage mechanism of tin zrn nanoscale multilayer anti erosion coating
THE Coatings, 2018Co-Authors: Mingrui Geng, Zhiping Sun, Jiao Chen, Zhufang YangAbstract:TiN/ZrN multilayers can effectively improve the erosion resistance of metals, particularly titanium alloys employed in aero engines. To explore the Corrosion damage mechanism of TiN/ZrN nanoscale multilayers (nanolaminate), a novel [TiN/ZrN]100 nanolaminate coating was deposited on Ti-6Al-4V alloys by multi-arc ion plating method. Salt spray Corrosion Tests and hot Corrosion experiment were carried out to evaluate the Corrosion resistance of the coating. The Corrosion and damage mechanisms were explored with the help of detailed microstructure, phase composition and element distribution characterizations. The salt spray Corrosion Tests showed that the [TiN/ZrN]100 nanolaminate coating possessed good Corrosion resistance, which protected substrate against the Corrosion. The low temperature hot Corrosion Tests showed that the oxidation occurred on the surface of the coating, which improved the oxidation resistance of the sample. However, the oxidized droplets squeezed the coating, and destroyed the oxidized layers. As a result, the coating was peeled off from the substrate. The research highlights the Corrosion resistance of the novel TiN/ZrN nanolaminate coating and offers a support for their application in engine compressor blade.
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Corrosion Damage Mechanism of TiN/ZrN Nanoscale Multilayer Anti-Erosion Coating
MDPI AG, 2018Co-Authors: Mingrui Geng, Zhiping Sun, Jiao Chen, Zhufang YangAbstract:TiN/ZrN multilayers can effectively improve the erosion resistance of metals, particularly titanium alloys employed in aero engines. To explore the Corrosion damage mechanism of TiN/ZrN nanoscale multilayers (nanolaminate), a novel [TiN/ZrN]100 nanolaminate coating was deposited on Ti-6Al-4V alloys by multi-arc ion plating method. Salt spray Corrosion Tests and hot Corrosion experiment were carried out to evaluate the Corrosion resistance of the coating. The Corrosion and damage mechanisms were explored with the help of detailed microstructure, phase composition and element distribution characterizations. The salt spray Corrosion Tests showed that the [TiN/ZrN]100 nanolaminate coating possessed good Corrosion resistance, which protected substrate against the Corrosion. The low temperature hot Corrosion Tests showed that the oxidation occurred on the surface of the coating, which improved the oxidation resistance of the sample. However, the oxidized droplets squeezed the coating, and destroyed the oxidized layers. As a result, the coating was peeled off from the substrate. The research highlights the Corrosion resistance of the novel TiN/ZrN nanolaminate coating and offers a support for their application in engine compressor blade
Carlos Rodrigo De Mello Roesler - One of the best experts on this subject based on the ideXlab platform.
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characterization of the fretting Corrosion behavior surface and debris from head taper interface of two different modular hip prostheses
Journal of The Mechanical Behavior of Biomedical Materials, 2016Co-Authors: Claudio Teodoro Dos Santos, Cassio Barbosa, Ieda Maria Vieira Caminha, Maurício De Jesus Monteiro, Ibrahim De Cerqueira Abud, Carlos Rodrigo De Mello RoeslerAbstract:Abstract Modular hip prostheses are flexible to match anatomical variations and to optimize mechanical and tribological properties of each part by using different materials. However, micromotions associated with the modular components can lead to fretting Corrosion and, consequently, to release of debris which can cause adverse local tissue reactions in human body. In the present study, the surface damage and residues released during in vitro fretting Corrosion Tests were characterized by stereomicroscope, SEM and EDS. Two models of modular hip prosthesis were studied: Model SS/Ti Cementless whose stem was made of ASTM F136 Ti-6Al-4V alloy and whose metallic head was made of ASTM F138 austenitic stainless steel, and Model SS/SS Cemented with both components made of ASTM F138 stainless steel. The fretting Corrosion Tests were evaluated according to the criteria of ASTM F1875 standard. Micromotions during the test caused mechanical wear and material loss in the head-taper interface, resulting in fretting-Corrosion. Model SS/SS showed higher grade of Corrosion. Different morphologies of debris predominated in each model studied. Small and agglomerated particles were observed in the Model SS/Ti and irregular particles in the Model SS/SS. After 10 million cycles, the Model SS/Ti was more resistant to fretting Corrosion than the Model SS/SS.
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Fretting Corrosion Tests on orthopedic plates and screws made of ASTM F138 stainless steel
Research on Biomedical Engineering, 2015Co-Authors: Claudio Teodoro Dos Santos, Cassio Barbosa, Ieda Maria Vieira Caminha, Maurício De Jesus Monteiro, Ibrahim De Cerqueira Abud, Carlos Rodrigo De Mello RoeslerAbstract:Introduction Although there has been significant progress in the design of implants for osteosynthesis, the occurrence of failures in these medical devices are still frequent. These implants are prone to suffer from fretting Corrosion due to micromotion that takes place between the screw heads and plate holes. Consequently, fretting Corrosion has been the subject of research in order to understand its influence on the structural integrity of osteosynthesis implants. The aim of this paper is to correlate the surface finish characteristics of bone plate-screw systems with fretting Corrosion. Methods The surface finish (machined and polished) of five specimens taken from three commercial dynamic compression plates (DCP) were evaluated. For testing, the specimens were fixed with bone screws, immersed in a solution of 0.90% NaCl and subjected to a rocking motion with an amplitude of 1.70 mm and frequency of 1.0 Hz for 1.0 × 106 cycles, according to the ASTM F897 standard. Both, plate and screws were manufactured in Brazil with ASTM F138 stainless steel. Results Flaws on the hole countersink area and on the screw thread of some specimens were identified stereoscopically. At the end of the test all the specimens showed evidence of fretting Corrosion with an average metal loss of 4.80 mg/million cycles. Conclusion An inadequate surface finish in some areas of the plates and screws may have favored the incidence of damage to the passive film, accelerating the fretting Corrosion at the interfaces between the plate hole countersink and the screw head. Keywords Osteosynthesis, DCP, Bone plate, Screw, Fretting Corrosion, Stainless steel.
Akira Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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microstructural stability of nanostructured ysz alumina composite tbc compared to conventional ysz coatings by means of oxidation and hot Corrosion Tests
Journal of Alloys and Compounds, 2014Co-Authors: A Keyvani, M Saremi, Mahmoud Heydarzadeh Sohi, Zia Valefi, M Yeganeh, Akira KobayashiAbstract:Abstract The spallation of ceramic coating from the bond coat is important problem for TBC systems. And the spallation is caused the oxidation and Corrosion at the interface of ceramic layer and bond coat. In this research the stability of conventional YSZ coating was compared to the particulate nanostructured YSZ + alumina composite coating by means of oxidation and hot Corrosion Tests. The coatings have been deposited by plasma spray method. High temperature oxidation test at 1100 °C and hot Corrosion test at 1050 °C using Na2SO4 and V2O5 molten salts were performed on the coatings. The experimental results showed nanostructured YSZ + Al2O3 composite coating had higher oxidation and hot Corrosion resistance than those of the conventional YSZ coating. The microstructural analysis indicated that the growth of TGO was much less for this nanostructured composite coating while it reduced infiltration of both oxygen and aggressive molten salt.
Mingrui Geng - One of the best experts on this subject based on the ideXlab platform.
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Corrosion damage mechanism of tin zrn nanoscale multilayer anti erosion coating
THE Coatings, 2018Co-Authors: Mingrui Geng, Zhiping Sun, Jiao Chen, Zhufang YangAbstract:TiN/ZrN multilayers can effectively improve the erosion resistance of metals, particularly titanium alloys employed in aero engines. To explore the Corrosion damage mechanism of TiN/ZrN nanoscale multilayers (nanolaminate), a novel [TiN/ZrN]100 nanolaminate coating was deposited on Ti-6Al-4V alloys by multi-arc ion plating method. Salt spray Corrosion Tests and hot Corrosion experiment were carried out to evaluate the Corrosion resistance of the coating. The Corrosion and damage mechanisms were explored with the help of detailed microstructure, phase composition and element distribution characterizations. The salt spray Corrosion Tests showed that the [TiN/ZrN]100 nanolaminate coating possessed good Corrosion resistance, which protected substrate against the Corrosion. The low temperature hot Corrosion Tests showed that the oxidation occurred on the surface of the coating, which improved the oxidation resistance of the sample. However, the oxidized droplets squeezed the coating, and destroyed the oxidized layers. As a result, the coating was peeled off from the substrate. The research highlights the Corrosion resistance of the novel TiN/ZrN nanolaminate coating and offers a support for their application in engine compressor blade.
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Corrosion Damage Mechanism of TiN/ZrN Nanoscale Multilayer Anti-Erosion Coating
MDPI AG, 2018Co-Authors: Mingrui Geng, Zhiping Sun, Jiao Chen, Zhufang YangAbstract:TiN/ZrN multilayers can effectively improve the erosion resistance of metals, particularly titanium alloys employed in aero engines. To explore the Corrosion damage mechanism of TiN/ZrN nanoscale multilayers (nanolaminate), a novel [TiN/ZrN]100 nanolaminate coating was deposited on Ti-6Al-4V alloys by multi-arc ion plating method. Salt spray Corrosion Tests and hot Corrosion experiment were carried out to evaluate the Corrosion resistance of the coating. The Corrosion and damage mechanisms were explored with the help of detailed microstructure, phase composition and element distribution characterizations. The salt spray Corrosion Tests showed that the [TiN/ZrN]100 nanolaminate coating possessed good Corrosion resistance, which protected substrate against the Corrosion. The low temperature hot Corrosion Tests showed that the oxidation occurred on the surface of the coating, which improved the oxidation resistance of the sample. However, the oxidized droplets squeezed the coating, and destroyed the oxidized layers. As a result, the coating was peeled off from the substrate. The research highlights the Corrosion resistance of the novel TiN/ZrN nanolaminate coating and offers a support for their application in engine compressor blade
Digby D Macdonald - One of the best experts on this subject based on the ideXlab platform.
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fretting Corrosion damage of total hip prosthesis friction coefficient and damage rate constant approach
Tribology International, 2013Co-Authors: Jean Geringer, Julie Pellier, Digby D MacdonaldAbstract:This paper analyzes friction coefficient evolution between materials related to total hip prosthesis. Fretting Corrosion Tests were conducted with stainless steel and poly(methyl methacrylate) interacting surfaces. In the course of fretting Corrosion Tests, the Coulomb friction coefficient is determined as a function of the number of cycles. It was found that the friction coefficient growth rate can be expressed as a power-law function. The influences of ionic strength, applied potential, pH, and albumin content on fretting Corrosion were then investigated on the basis of the evolution of the friction coefficient. Finally, we identify the damage rate constant as being relevant for linking the mechanical and chemical parameters in the evolution of damage.
