不同纳米添加剂下GCr15/45钢自修复性能研究

利用高精度液压式往复试验机研究了纳米羟基磷酸钙、纳米二氧化钛、纳米氮化钛3种纳米添加剂润滑条件下GCr15/45钢对摩时的摩擦磨损性能,通过扫描电子显微镜和EDX能谱对磨斑进行了微观分析。结果表明:纳米润滑添加剂可以降低摩擦副摩擦因数和材料磨损量,表现出优良的抗磨损性能;3种纳米添加剂具有不同的自修复机制,其中纳米羟基磷酸钙和纳米二氧化钛的修复机制主要为铺展成膜自修复,而纳米氮化钛为铺展成膜自修复和原位摩擦化学自修复并存;纳米氮化钛的自修复效果最佳,纳米二氧化钛的自修复性能最差。

An Investigation on Self-repairing Properties of GCr15/45 Steel under Different Nano-particle Additives

The friction and wear behaviors of GCr15/45 steel were investigated in the lubrication with nano-particle Ca10(PO4)6(OH)2,TiO2 and TiN additives conditions using a reciprocating horizontal tribometer.The wear and self-repairing mechanism of the nano-particle additives were analyzed by means of Scanning Electron Microscope(SEM) and energy dispersive X-ray detector(EDX).The results indicate that the friction coefficient and the wear volume of 45# steels decrease under different nano-particle additive conditions.Three kinds of nano-particle additives have different self-repairing mechanism.The spreading films are dominant in the self-repairing process for nano-particle Ca10(PO4)6(OH)2 and TiO2.However,the spreading films and in-situ tribo-chemical self-repairing are dominating for nano-particle TiN additive.In conclusion,the self-repairing effect of TiN is best,the self-repairing effect of TiO2 is worst.