退火处理对CrAlN硬质涂层组织结构与力学性能的影响

Effect of Annealing Treatment on Microstructure and Mechanical Properties of CrAlN Hard Coating

采用多弧离子镀技术在高速钢表面制备CrAlN涂层,并在不同温度下进行了退火处理。采用划痕仪、硬度计、扫描电子显微镜、X射线衍射仪、摩擦磨损试验机等探究退火处理对涂层的组织结构、力学性能和摩擦磨损性能的影响。结果表明退火处理后,涂层硬度降低,粗糙度升高,Cr和Al元素减少,O元素含量增加;退火后晶粒发生粗化,其中经过700℃退火后的CrAlN涂层具有较高的硬度、优异的结合力和最低的摩擦系数,涂层表现出优异的耐磨减摩性能和高温稳定性;退火后涂层磨损机制从磨粒磨损转为磨粒磨损和粘着磨损。

The CrAlN coating was prepared on the surface of high speed steel by multi-arc ion plating and annealed at different temperatures.The effects of heat treatment on the microstructure,mechanical properties and friction and wear properties of the coating were investigated by scratch tester,hardness tester,scanning electron microscope(SEM),X-ray diffraction(XRD)and friction and wear tester(UMT-3).The results show that after annealing,the hardness of the coating decreases,the roughness increases,the Cr and Al elements decrease,and the O element content increases.The grain coarsening occurred after annealing.The CrAlN coating annealed at 700℃ has higher hardness,excellent binding force and the lowest friction coefficient.The coating has excellent wear resistance and friction reduction performance and high temperature stability.After annealing,the wear mechanism of coating changes from abrasive wear to abrasive wear and adhesion wear.