激光织构化形貌对密封配副摩擦学性能的影响

为了研究表面织构化对端面密封材料摩擦性能的影响,采用Nd:YAG固体脉冲激光对GCr15钢盘表面进行了织构化处理,形成了微孔型和凹槽型两种表面形貌。在摩擦试验机上模拟端面密封形式对聚四氟乙烯环/GCr15盘进行摩擦学性能测试,并对试样表面的磨损形貌进行了分析。结果表明,在油润滑条件下,织构化试样的摩擦因数和磨损量均低于光滑试样的,且微孔型织构的耐磨性优于凹槽形的,因为凹槽型织构排列使油膜厚度不均匀,摩擦因数波动大;在干摩擦条件下,适当的织构形貌对转移膜的保持有利,同时可以捕获磨屑,减少磨粒磨损的作用。与光滑配副相比,表面织构降低了配副双方的磨损率。

Effect of laser-texturing morphology on tribological performance of face seal pairs

In order to study effect of laser surface texturing on tribological properties of face seal materials, GCr15 steel disc was textured by Nd:YAG solid-state pulsed laser to form two surface morphologies of dimple and groove. The tribological performance for polytetrafluoroethylene ring/GCr15 disc (simulating face seal) was tested on the friction tester and the worn surface morphologies were analyzed. The results show that friction coefficient and wear loss of textured samples are lower than the smooth in the oil lubrication condition. And the wear resistance of dimple-textured sample was better than the groove because the groove-textured arrangement caused the oil film thickness uneven and the friction coefficient fluctuated. Under the dry friction condition, the existence of the favorable texturing can maintain the transfer film, capture wear debris and reduce abrasive wear. Compared with the smooth sample, the wear rate of the pair can be reduced.