This work is aimed to study the effect of boron on wear resistance of Fe-Cr-B alloys containing different boron contents(0 wt%,5 wt%,7 wt%and 9 wt%)from room temperature(RT)to 800°C in order to explore their appl...This work is aimed to study the effect of boron on wear resistance of Fe-Cr-B alloys containing different boron contents(0 wt%,5 wt%,7 wt%and 9 wt%)from room temperature(RT)to 800°C in order to explore their applications as high-temperature wear resistant mechanical parts.Additionally,the wear mechanism of alloys is evaluated.The tribological properties of alloys are systematically studied by using a ball-on-disc tribometer at 10 N and 0.20 m/s from RT to 800°C sliding against Si3N4 ceramic ball.The boron element greatly improves the wear resistance of specimens as compared with that of unreinforced specimen.The friction coefficients of specimens decrease with increasing of testing temperature.The wear rates of Fe-Cr-B alloys decrease firstly and then raise with the increase of boron content.The specific wear rates of specimens with boron are 1/10 of the unreinforced specimen.Fe-21wt%Cr-7wt%B keeps the best tribological properties at high temperature.展开更多
The oxidation performance and tribological properties of the anodized Ti45Al8.5Nb were investigated.Anodization was performed in ethylene glycol containing 0.15 mol/L NH_(4)F.Results showed that the anodized Ti45Al8.5...The oxidation performance and tribological properties of the anodized Ti45Al8.5Nb were investigated.Anodization was performed in ethylene glycol containing 0.15 mol/L NH_(4)F.Results showed that the anodized Ti45Al8.5Nb alloy exhibited good resistance against oxidation.After 100 h oxidation at 1000℃,the mass gain of the anodized Ti45Al8.5Nb alloy was only 0.37 mg/cm^(2).This is attributed to the generation of protective oxide scale.On the other hand,the hardness and elastic modulus of the anodized Ti45Al8.5Nb alloy decreased and then increased with the prolonging of thermal exposure due to the generation of the Al_(2)O_(3)-enriched outermost oxide layer.展开更多
基金Projects(51775365,51405329) supported by the National Natural Science Foundation of ChinaProject(2015M570239) supported by the China Postdoctoral Science Foundation
文摘This work is aimed to study the effect of boron on wear resistance of Fe-Cr-B alloys containing different boron contents(0 wt%,5 wt%,7 wt%and 9 wt%)from room temperature(RT)to 800°C in order to explore their applications as high-temperature wear resistant mechanical parts.Additionally,the wear mechanism of alloys is evaluated.The tribological properties of alloys are systematically studied by using a ball-on-disc tribometer at 10 N and 0.20 m/s from RT to 800°C sliding against Si3N4 ceramic ball.The boron element greatly improves the wear resistance of specimens as compared with that of unreinforced specimen.The friction coefficients of specimens decrease with increasing of testing temperature.The wear rates of Fe-Cr-B alloys decrease firstly and then raise with the increase of boron content.The specific wear rates of specimens with boron are 1/10 of the unreinforced specimen.Fe-21wt%Cr-7wt%B keeps the best tribological properties at high temperature.
基金financial supports from the National Natural Science Foundation of China (No. 51971205)the Guangdong Basic and Applied Basic Research Foundation, China (No. 2021B1515020056)the Shenzhen Fundamental Research Program, China (No. JCYJ20190807154005593)。
文摘The oxidation performance and tribological properties of the anodized Ti45Al8.5Nb were investigated.Anodization was performed in ethylene glycol containing 0.15 mol/L NH_(4)F.Results showed that the anodized Ti45Al8.5Nb alloy exhibited good resistance against oxidation.After 100 h oxidation at 1000℃,the mass gain of the anodized Ti45Al8.5Nb alloy was only 0.37 mg/cm^(2).This is attributed to the generation of protective oxide scale.On the other hand,the hardness and elastic modulus of the anodized Ti45Al8.5Nb alloy decreased and then increased with the prolonging of thermal exposure due to the generation of the Al_(2)O_(3)-enriched outermost oxide layer.
