激光表面微孔化改善端面密封的摩擦学性能

采用Nd:YAG脉冲激光器在T8钢表面进行微孔化处理,模拟机械端面密封的摩擦工况,利用环-盘式摩擦试验机测试其不同载荷和速度条件下的摩擦学性能。结果表明:激光微孔化的T8钢盘表面的微孔直径为200 mm,切向间距800 mm,径向间距400 mm,孔中心深度为10 mm左右;随着载荷和速度的增大,微孔结构摩擦副和光滑摩擦副的摩擦因数都呈先减小后增大的趋势,但与光滑摩擦副相比,多孔端面密封可以将最大pv提高2.5倍。微孔可作为润滑剂存储器在摩擦过程中持续给接触面间供油,同时可捕捉摩擦面间的磨损粒子减少犁沟的形成,因而激光微孔技术是一种减小磨损、增加润滑膜的使用寿命的有效方法。

Laser Surface-micropored Improving Tribological Properties of Face Seals

A Nd:YAG laser was used to generate micropores on T8 steel surface.Tribological experiments were conducted with a ring-on-disk under various load and velocity by simulating the frictional manner of face seal.The results show the microdimple is about 200 mm in diameter and 10 mm in depth with the transverse distance of 400 mm and the radial interval of 800 mm.The polished and micropored frictional mates have the similar trend with the load and speed increasing.Compared with the polished one,the micropored face seal improves the maximum pv value to 2.5 times.Micropores can act as lubricant reservoirs to provide oil to contact surface and trap debris to decrease plough.So the laser-micropored technology is an effective way to reduce wear and prolong the lifetime of lubricating flim.