激光织构和碳基薄膜复合处理提高钛合金摩擦学性能研究

Research on Laser Texture and Carbon-Based Film CompositeTreatment to Improve the Tribological Properties of Titanium Alloy

在重载滑动干摩擦条件下,对比不同织构密度的钛合金表面的摩擦学性能;在耐磨性最好的织构密度钛合金表面再制备碳基薄膜,并与直接在钛合金表面制备的碳基薄膜的摩擦学性能进行对比。结果表明:3种低织构密度条件下,TC4钛合金的摩擦因数减小、磨损率降低;随着织构密度的增大,钛合金材料的摩擦因数变化极小,磨损率有所增加;在织构密度5.95%的钛合金表面制备的碳基薄膜,因织构微凹处产生的小微湍流,减少了摩擦阻力,使得其摩擦因数相比直接在钛合金表面制备的碳基薄膜的摩擦因数有所减小。织构化碳基薄膜的磨损率比钛合金的磨损率降低了99.31%,比直接在钛合金表面制备碳基薄膜的磨损率也降低了约60%,这是因为高接触应力摩擦过程中触发石墨化转变,被磨损的石墨化颗粒碎片嵌入织构微凹中,抑制了摩擦接触界面的磨损行为。

Effect of different texture density on tribological properties of titanium alloy was studied under heavy-load sliding friction.The carbon-based film was prepared on the texture surface of titanium alloy with the best wear resistance,and the tribological properties were compared with those of the carbon-based film prepared directly on the surface of titanium alloy.Results show that the friction coefficient and the wear rate of TC4 titanium alloy are decreased under three low texture density conditions.With the increase of texture density,the friction coefficient of titanium alloy changes little,but wear rate is increased.The friction coefficient of the carbon-based film deposited on the titanium alloy texture surface with texture density of 5.95%is lower than that of the carbon-based film directly on the titanium alloy surface due to the small turbulence in texture concave.The wear rate of the textured carbon-based film is 99.31%lower than that of titanium alloy,and about 60%lower than that of carbon-based film prepared directly on titanium alloy surface.This is because the graphitization transition is triggered in the process of high contact stress friction,and the worn graphitized particles are embedded into the texture concave,which inhibits the wear behavior of the friction-contact interface.