配副金属表面粗糙度对丁腈橡胶O型圈摩擦学特性的影响

Effect of Surface Roughness of Metalic Counterpart on Tribological Characteristics of NBR O-ring

UMT-3多功能摩擦磨损试验机上,以丁腈橡胶O型圈/316L不锈钢粗糙表面配副为研究对象,系统研究了配副金属表面粗糙度对丁腈橡胶摩擦学行为的影响,重点探讨了不同表面粗糙度下摩擦系数和磨损体积的变化规律、揭示了不同表面粗糙度下橡胶表面的损伤机制.结果表明:表面粗糙度对丁腈橡胶O型圈的摩擦磨损有重要影响;随着表面粗糙度的增加,稳定阶段的摩擦系数呈先降低后升高的变化趋势.当表面粗糙度在Ra为0.1μm左右时,丁腈橡胶表现出较低的摩擦系数和材料磨耗,磨损表面呈现出典型的花纹磨损特征;而过高或过低的表面粗糙度下丁腈橡胶均表现出较高的摩擦系数和材料磨耗,其磨损机制以黏着磨损和疲劳磨损为主.

Tribological tests for nitrile butadiene rubber（NBR） O-Ring against 316 L stainless steel with different surface roughness were carried out on UMT-3 multi-function friction and wear tester. The effect of surface roughness of metallic counterpart on tribological behaviors of NBR was researched systematically. The variation of friction coefficient and wear volume were discussed, and the damage mechanism of rubber was revealed for different surface roughness. The results show that effect of the surface roughness on the friction and wear properties of nitrile butadiene rubber O-ring was remarkable. With the increase of the surface roughness, the friction coefficient in the stable stage decreased firstly and then increased. When the surface roughness was about 0.1 μm, the friction coefficient and wear rates of nitrile butadiene rubber were minimal and the worn surface presented a typical decorative wear pattern. When the surface roughness in the test block was too high or too low, the friction coefficient and the wear rates of the nitrile butadiene rubber were relatively higher and the wear mechanisms were adhesive wear and fatigue wear mainly.