激光表面织构化钛合金摩擦学性能研究

Tribological properties analysis of laser surface textured titanium alloy

通过激光刻蚀在钛合金表面形成50,100,150,200μm等宽栅条和50,100,200μm直径均布点坑。采用UMT-2进行富油润滑摩擦磨损实验。通过Phillips XL30扫描电子显微镜观察磨痕形貌。研究结果表明:等宽栅条和均布点坑都有储存油液、利于形成润滑油膜、收集磨屑的作用;纹理表面摩擦因数都有所降低,减摩效果与纹理尺寸相关,也受荷载影响;等宽栅条减摩效果优于均布点坑;纹理尺寸越小摩擦因数越低,耐磨性越差;载荷为1～3 N时,50μm等宽栅条取得最好减摩抗磨效果,摩擦因数为0.116～0.124,耐磨时间也较长;4～6 N时,100μm等宽栅条最好,摩擦因数约0.19。

50 μm、100 μm、150 μm、200 μm aequilate grid strip and 50 μm、100 μm、200 μm diameter distribution pit were formed on surface of tianium alloy by laser etching.Friction-wear test was performed with UMT-2.The surface morphology of wear specimens were observed by scanning electron microscope(SEM).The experimental results show aequilate grid strip and distribution both can store oil,advantage oil film and collect abrasive dust.The friction coefficient of textured surface is reduced,which associated with the texture size and influenced by load.The antifriction effect of the aequilate grid strip is better than distribution pit.The small size texture has low friction coefficient and is easy to wear.50 μm equilate grid strip gets the best effiction of reducing friction coefficient,which is 0.116~0.124 and sustained for a long time under load 1~3 N.100um aequilate grid strip has the best friction coefficient about 0.19 under load 4~6 N.