聚酰亚胺摩擦学性能的研究

Study on Tribology Property of Polyimide

对热模压成型的聚酰亚胺(PI)试样在MHK-500型环-块摩擦试验机上测试了不同载荷P(N)、摩擦速度V(m·s-1)情况下,摩擦系数μ与摩擦持续时间t(min)的关系,并探讨了μ值随t,P,V变化的摩擦规律。结果表明V值增加,使第一阶段的μ峰值降低,峰值到来时间加快,峰宽变窄,第二阶段到来时间提前。而P值增加除了使μ峰值降低外,对第一、二阶段的其他参数的影响却相反。摩擦系数μ的表征值分别与P,V没有单值关系,而与单位面积所受的载荷p(MPa)和速度V的乘积pV值(MPa·m·s-1)具有指数关系。

The relation between friction coefficient (μ) and time (t) of PI sample molded by heating pressing was tested on ring-block tribology machine under different loads (P), velocities (V), and tribology laws of the changing of friction coefficient with time, load and velocity were discussed. The results show that, with the increase of V, peak of μ decreases, time of peak arriving accelerates and peak's width becomes narrow in the first stage, and time of arriving on the second stage brings forward. The effect of P on μ is similar to V on μ, but the effects of P on time of peak arriving and peak's width are contrary. In the third stage, the steady value of μ doesn't have single value relation to P or V, while have the exponent relation with unit load (p) and velocity's product (pV, MPa·m·s-1).