等离子熔覆Cr<sub>7</sub>C<sub>3</sub>/γ-Fe金属陶瓷复合材料涂层的耐磨性

等离子熔覆Cr₇C₃/γ-Fe金属陶瓷复合材料涂层的耐磨性

摘要: 采用等离子熔覆技术,在调质C3钢表面制得以原位生成初生相Cr7C3为增强相的金属陶瓷复合材料涂层;利用SEM、XRD 和EDS等分析了涂层的显微组织和相组成;测试了在室温干滑动磨损及高温滑动磨损条件下涂层的耐磨性,并讨论了其磨损机理.结果表明:涂层的相组成是Cr7C3增强相和γ-Fe固溶体与少量Cr7C3构成的共晶;涂层在室温和高温干滑动磨损条件下均具有优良的耐磨性能.

Abstract: A new type in-situ reinforcing Cr7C3 ceramal composite coating was fabricated on carbon steel(C3) substrate by plasma cladding.Microstructure of the ceramal composite coating was characterized by SEM,XRD and EDS.Room and high temperature wear properties were evaluated under dry sliding wear test conditions and their wear mechanism was discussed.The plasma clad ceramal composite coating consistsed of primary Cr7C3 and Cr7C3/γ-Fe eutectics.The coating possessed excellent sliding wear resistance under both room and high temperature test conditions.