IG-11石墨在不同气氛中的磨损性能研究

在SRV摩擦磨损试验机上研究了10MW高温气冷堆用石墨材料IG-11自配副及其与不锈钢配副在空气和氦气气氛中的磨损性能,并利用扫描电子显微镜分析了试样磨损表面形貌.结果表明:环境气氛对石墨自配副磨损性能的影响较大,在氦气环境中石墨的磨损率较大,磨屑尺寸相对较小且呈棱状,主要发生磨料磨损;在空气环境中石墨的磨损率相对较小,磨屑尺寸相对较大,且形成大量片状磨屑,主要发生疲劳磨损;而就石墨与不锈钢摩擦配副而言,由于硬质不锈钢表面粗糙峰对石墨的切削作用,环境气氛的影响减弱.

Wear Behavior of Graphite IG-11 in Different Gas Environments

An SRV friction and wear tester was performed to evaluate the wear behavior of graphite IG-11 used in 10MW high temperature gas-cooled reactor (HTR-10) in sliding against graphite and stainless steel at ambient temperature in air and helium. The worn surfaces of the upper graphite samples sliding against the graphite and stainless lower counterpart were observed using a scanning electron microscope. It was found that the wear behavior of the graphite was closely to the gas environment as it slid against the graphite counterpart. Contrary to the above, the effect of the gas environment on the wear behavior of the graphite became insignificant as it slid against the stainless steel counterpart. This was because the plowing of the graphite by the hard stainless asperity played a dominant role for the graphite-stainless steel pair. At the same time, the differences in the wear resistance and worn surface features of the graphite samples in different gas environments conformed to the differences in the shape and size of the corresponding wear debris. Namely, the graphite sample was dominated by abrasive wear in helium environment, which corresponded to a large wear rate of the graphite and small size of the wear debris. While in air environment, the graphite was characterized by fatigue wear, which corresponded to a small wear rate of the graphite and large size of the wear debris as compared in helium.