目的 研究表面织构对金属-聚甲醛(POM)摩擦副磨损行为和机理的影响.方法 通过光刻-电解的方法加工出带有不同参数凹坑的不锈钢试样与聚甲醛(POM)材料配副,在万能摩擦磨损试验机上进行摩擦磨损实验,以评价其摩擦学性能.利用光学显微镜、三维形貌仪和SEM对磨损后的表面形貌以及磨屑形态进行观察分析.结果 凹坑深度为5μm、面积率为10%时,减磨效果最明显,磨损率相比无织构试样下降了36.2%.凹坑深度为10μm时,表面织构的引入起到了增大磨损的效果.结论 合适参数的表面织构能够有效减小大面积的材料粘着转移现象,对摩擦副具有良好的减磨效果.不恰当的表面织构参数会在凹坑边缘引发严重的应力集中现象,导致不锈钢试样对软材料微切削作用产生,这也是材料磨损率急剧增大的原因.
The work aims to study the effects of surface texture on wear behavior and mechanism of friction pair made of metal and POM. Lithography-electrolytic technology was applied to fabricate pairs of stainless steel specimen and POM with dimples in different parameters. Friction-wear tests were carried out ona MMW-1 friction tester to study tribological properties. Surface morphologyand wear debris morphologyof the worn mating surfaces were observed and analyzedwithan optical micro-scope, 3D surface profiler and SEM.Wear rate of the friction pair was the lowest at the dimple depth of 5μm and area density of 10%, which decreased by 36.2% compared to un-textured pairs. The wear rate was increased by introduction of the surface tex-ture at the dimple depth of 10μm. Surface texture with appropriate parameters can reduce POM transfer and wear effective-ly,while surface texture with improper parameters can cause stress concentration around the edges of dimples, thus resulting in sharp increase of wear rate.
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