Inconel690合金表面WC-10Co-4Cr和CoCrW涂层的微动磨损特性

摘要

In order to improve the fretting wear behavior of Inconel690 alloy,WC-10Co-4Cr and CoCrW coatings were prepared on the surface of Inconel690 alloy by using High Velocity Oxy-Fuel(HVOF) spraying technique.The fretting wear behavior of the coatings was investigated on the PLINT fretting wear tester.The experimental results show that when the normal load unchanged,with the displacement amplitude increasing,the friction coefficient of the coatings becomes large.Under the same experimental conditions,the steady friction coefficient of WC-10Co-4Cr and CoCrW coatings is less than that of Inconel690 alloy,the wear resistance of them is significantly better than that of Inconel690 alloy,and WC-10Co-4Cr coating is slightly better than CoCrW in the wear resistance.A lot of flaking pits and delamination are showed up on the worn surface of these two coatings according to surface morphological analysis.The main wear damage mechanism of coatings is abrasive wear and delamination.%为了提高Inconel690合金管的耐磨性,采用超音速火焰喷涂技术(HVOF)在Inconel690合金管表面制备WC-10Co-4Cr和CoCrW两种涂层,在PUNT微动磨损试验机上考察其微动磨损性能.试验结果表明:载荷一定时,涂层的摩擦因数随着位移的增加而变大;相同试验条件下,在稳定阶段,WC-10Co-4Cr和CoCrW涂层的摩擦因数小于Inconel690;两种涂层的耐磨性均显著优于Inconel690合金,而WC-10Co-4Cr涂层的耐磨性略优于CoCrW涂层.磨损表面形貌分析表明,两种涂层的磨痕表面存在剥落坑和剥层现象,磨损机制以剥层和磨粒磨损为主.