等离子喷涂纳米WC-17Co涂层高温磨损性能

Wear behavior of plasma sprayed nanostructured WC-17Co coatings at elevated temperature

摘要: 磨损是材料失效的主要失效形式之一,纳米WC-Co涂层技术可望成为解决重大装备关键零部件耐磨的关键技术。文中用等离子喷涂的方法制备了纳米WC-17Co涂层以及超细WC-17Co涂层,研究了涂层的高温磨损性能及失效机理。结果表明,WC-17Co纳米涂层与同成分的超细涂层相比具有较高的耐高温磨损性能。纳米涂层与超细涂层高温磨损失效机理不同,WC-17Co纳米涂层的高温磨损失效机理以磨粒磨损为主,伴随着黏着磨损,超细涂层的高温磨损失效机理以低延性开裂和黏着磨损为主,伴随有磨粒磨损。

Abstract: Wear is one of main material failure forms.Nanostructured WC-Co coating technology is expected to become a key technology to solve wear-resistance of critical components in largescale equipments.Nanostructured and ultra-fine WC-17Co coatings were prepared by plasma spraying.The wear behavior at elevated temperature and failure mechanism were investigated.The results indicate that wear resistance at high temperature of the nanostructured WC-17Co coating is much better than that of the ultra-fine coating. The wear mechanism is different between the ultra-fine coating and the nanostructured coating, which low-ductility cracking and abrasive wear following with adhesive wear predominates in ultra-fine coating, and adhesive wear following with abrasive wear predominates in nanostructured coating.