一种针刺C/C复合材料-40Cr配副的摩擦学性能

Tribological Properties of A Kind of Needle Punching C/C Composites-40Cr Pair

采用MMUD-10B型摩擦磨损试验机分别在干摩擦和水润滑两种不同环境下,固定转速为100 r/min,在不同载荷下(70、150和230 N)对摩擦配副C/C-40Cr进行摩擦学性能对比分析及表征。利用奥林巴斯GX51金相显微镜观察试样表面的磨痕、采用JJ324BC型的电子天平表征每次实验的磨损量、使用JSM-6510A型扫描电子显微镜(带有EDS能谱仪)观察磨屑的形貌及各元素的原子比。结果表明:在干摩擦中,试样的摩擦因数较大,在0.046~0.070波动,磨损量较少,且摩擦因数与磨损量随着载荷的增加而增加;在水润滑摩擦情况下,摩擦因数变化范围较小,在0.037~0.052,但磨损量较大。干摩擦和水润滑条件下的摩擦因数和磨损量与载荷的大小呈正相关趋势。此外磨屑中稳定存在碳纤维和片层状的40Cr,磨损机制为黏着磨损和磨粒磨损共同作用。

The friction properties of friction pair C/C-40 Cr were analyzed and characterized by a friction and wear tester under dry friction and water lubrication conditions with fixed rotation speed of 100 r/min and three different loads(70,150 and 230 N). The wear marks on the surface of the samples were observed by a metallographic microscope,the wear amount of each experiment was characterized by a electronic balance,and the morphology of wear debris and atomic ratio of each element were observed by a scanning electron microscope(with EDS energy spectrosocpic system). The experimental results show that in dry friction,the friction coefficient fluctuates at 0. 046 to0. 070,and the friction coefficient and wear amount increase with the increase of load,while in water lubrication,the variation range of friction coefficient is small from 0. 037 to 0. 052,but the wear amount is more. Under dry friction and water lubrication,the friction coefficient and wear amount are positively correlated with the load. Carbon fiber and laminated 40 Cr structure exist stably in the wear debris. The wear mechanism is adhesive wear and abrasive wear.