The Experts below are selected from a list of 17517 Experts worldwide ranked by ideXlab platform
T. Yilmaz - One of the best experts on this subject based on the ideXlab platform.
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Thermal Aging effects on mechanical and tribological performance of PEEK and short fiber reinforced PEEK composites
Materials & Design, 2020Co-Authors: Tamer Sınmazçelik, T. YilmazAbstract:Abstract The effects of Thermal Aging on the properties of unfilled and random oriented short fiber reinforced PEEK and its composites have been studied. After the isoThermal Aging process, there is a remarkable decrease in degree of crystallinity but more organized crystallize structure achieved. As a result of transcrystalline layer formation, there was a considerable increase in the flexural modulus of materials. Thermal Aging affects the impact properties of filled and unfilled PEEK dramatically. F max , E max and E · F max results of both filled and unfilled aged PEEK and its composites are dramatically decreased. Thermal Aging makes materials more brittle and there was a significant decrease in toughness. % Crystallinity is not the unique parameters to determine polymer’s performance. The orientation of crystals is another important parameter in microstructure and plays important role in mechanical and tribological properties of PEEK and its composites. There is a close relationship between Thermal Aging and microstructure. But there is not a linear relationship between microstructure and tribological properties. Microstructural changes after Thermal Aging serves developed mechanical properties. Increased mechanical properties results in improved tribological properties.
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Thermal Aging effects on mechanical and tribological performance of PEEK and short fiber reinforced PEEK composites
Materials and Design, 2007Co-Authors: Tamer Sınmazçelik, T. YilmazAbstract:The effects of Thermal Aging on the properties of unfilled and random oriented short fiber reinforced PEEK and its composites have been studied. After the isoThermal Aging process, there is a remarkable decrease in degree of crystallinity but more organized crystallize structure achieved. As a result of transcrystalline layer formation, there was a considerable increase in the flexural modulus of materials. Thermal Aging affects the impact properties of filled and unfilled PEEK dramatically. Fmax, Emaxand E · Fmaxresults of both filled and unfilled aged PEEK and its composites are dramatically decreased. Thermal Aging makes materials more brittle and there was a significant decrease in toughness. % Crystallinity is not the unique parameters to determine polymer's performance. The orientation of crystals is another important parameter in microstructure and plays important role in mechanical and tribological properties of PEEK and its composites. There is a close relationship between Thermal Aging and microstructure. But there is not a linear relationship between microstructure and tribological properties. Microstructural changes after Thermal Aging serves developed mechanical properties. Increased mechanical properties results in improved tribological properties. © 2005 Elsevier Ltd. All rights reserved.
Tamer Sınmazçelik - One of the best experts on this subject based on the ideXlab platform.
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Thermal Aging effects on mechanical and tribological performance of PEEK and short fiber reinforced PEEK composites
Materials & Design, 2020Co-Authors: Tamer Sınmazçelik, T. YilmazAbstract:Abstract The effects of Thermal Aging on the properties of unfilled and random oriented short fiber reinforced PEEK and its composites have been studied. After the isoThermal Aging process, there is a remarkable decrease in degree of crystallinity but more organized crystallize structure achieved. As a result of transcrystalline layer formation, there was a considerable increase in the flexural modulus of materials. Thermal Aging affects the impact properties of filled and unfilled PEEK dramatically. F max , E max and E · F max results of both filled and unfilled aged PEEK and its composites are dramatically decreased. Thermal Aging makes materials more brittle and there was a significant decrease in toughness. % Crystallinity is not the unique parameters to determine polymer’s performance. The orientation of crystals is another important parameter in microstructure and plays important role in mechanical and tribological properties of PEEK and its composites. There is a close relationship between Thermal Aging and microstructure. But there is not a linear relationship between microstructure and tribological properties. Microstructural changes after Thermal Aging serves developed mechanical properties. Increased mechanical properties results in improved tribological properties.
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Thermal Aging effects on mechanical and tribological performance of PEEK and short fiber reinforced PEEK composites
Materials and Design, 2007Co-Authors: Tamer Sınmazçelik, T. YilmazAbstract:The effects of Thermal Aging on the properties of unfilled and random oriented short fiber reinforced PEEK and its composites have been studied. After the isoThermal Aging process, there is a remarkable decrease in degree of crystallinity but more organized crystallize structure achieved. As a result of transcrystalline layer formation, there was a considerable increase in the flexural modulus of materials. Thermal Aging affects the impact properties of filled and unfilled PEEK dramatically. Fmax, Emaxand E · Fmaxresults of both filled and unfilled aged PEEK and its composites are dramatically decreased. Thermal Aging makes materials more brittle and there was a significant decrease in toughness. % Crystallinity is not the unique parameters to determine polymer's performance. The orientation of crystals is another important parameter in microstructure and plays important role in mechanical and tribological properties of PEEK and its composites. There is a close relationship between Thermal Aging and microstructure. But there is not a linear relationship between microstructure and tribological properties. Microstructural changes after Thermal Aging serves developed mechanical properties. Increased mechanical properties results in improved tribological properties. © 2005 Elsevier Ltd. All rights reserved.
Huiwei Miao - One of the best experts on this subject based on the ideXlab platform.
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microstructure evolution in sn bi and sn bi cu solder joints under Thermal Aging
Materials Chemistry and Physics, 2001Co-Authors: Huiwei MiaoAbstract:Abstract Binary eutectic Sn–Bi and ternary Sn–Bi–Cu alloys were fabricated and soldered to conductor metallized substrates to study the interfacial morphology and microstructural evolution of the joints under Thermal Aging. Different types of intermetallic compound (IMC), such as Cu 6 Sn 5 , (Cu, Ni) 6 Sn 5 and Ag 3 Sn, are observed among various metallized substrates including Cu/FR4, Ni/Cu/FR4, Cu/Al 2 O 3 and Pt–Ag/Al 2 O 3 . Three major effects of Aging on the microstructure of the solder joints are observed. First, the coarsening rate of the Bi-rich phase in the solder joint under Thermal Aging at 120°C is reduced by adding 1 wt.% Cu to the 42Sn–58Bi solder. Second, the Ag 3 Sn IMC forms planar layer at the solder/PtAg interface, while the Cu 6 Sn 5 intermetallic grows as scallop-like grains into the solder at the Cu/solder interface. Third, the growth of Ag 3 Sn intermetallic in the SnBi–1Cu/PtAg solder joint is slower than that in the 42Sn–58Bi/PtAg joint after Thermal Aging at 120°C.
Ying Wang - One of the best experts on this subject based on the ideXlab platform.
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Thermal Aging behavior of plasma sprayed lamgal11o19 Thermal barrier coating
Journal of The European Ceramic Society, 2011Co-Authors: Xiaolong Chen, Yu Zhao, Wenzhi Huang, Ying WangAbstract:Abstract The crystallization behavior of the amorphous phase of the plasma sprayed LaMgAl11O19 (LaMA) coating during Thermal Aging processes has been investigated. Results indicate that LaMA coating exhibits much similar microstructure and Thermal properties such as close coefficient of Thermal expansion and specific heat capacity etc. to the sintered LaMA bulk after Aging at 1673 K for 20 h. On the other hand, a solid state reaction seems to occur to reform the ideal magnetoplumbite-type LaMA phase coupled with the formations of the La-rich aluminate intermediate phases. When the Aging temperature is held between 1273 K and 1473 K, nanosized platelet-like grains as well as sub-grains with high aspect ratios are present. The phase stability has been investigated through the chemical compositions and X-ray diffraction analysis. The recrystallization mechanism of the amorphous LaMA coating has been explored by tracing the microstructure evolutions during Thermal Aging process.
Xin Zhong - One of the best experts on this subject based on the ideXlab platform.
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microstructure evolution and thermomechanical properties of plasma sprayed yb2sio5 coating during Thermal Aging
Journal of the American Ceramic Society, 2017Co-Authors: Xin Zhong, Hong Li, Yi Zeng, Xuebin Zheng, Chuanxian DingAbstract:Rare-earth monosilicates (RE2SiO5, RE: rare-earth elements), such as Yb2SiO5, have been developed for potential application as environmental barrier coating (EBC) materials. Yb2SiO5 coating would experience microstructure evolution under high-temperature environment and accordingly its thermomechanical properties would be altered. In this study, Yb2SiO5 coating was fabricated by atmospheric plasma spray technique. The phase stability and microstructure change before and after Thermal Aging at 1300°C, 1400°C, and 1500°C were investigated. The changes in mechanical and Thermal properties were characterized. The results showed that the as-sprayed coating was mainly composed of Yb2SiO5 with a small amount of Yb2O3 and amorphous phase. Defects in the coating, including interfaces, pores, and microcracks, were greatly reduced with grain growth after Thermal treatment. Thermal Aging significantly modified the Thermal and mechanical properties of the coating. The average CTE was increased by 13.1%, and the hardness and elastic modulus was increased by 42.4% and 49.4%, respectively, after Thermal Aging at 1500°C for 50 hour. The Thermal conductivity of Thermal-aged coating was much higher than that of the as-sprayed coating, which was still less than 2 W/(m·K). The influence of coating microstructure on the properties was analyzed and related to the failure mechanism of EBCs.
