不锈钢等离子喷焊钴基合金喷焊层的组织与性能

Microstructure and Performance of Co-based Alloy Coating Prepared by Plasma Spray Welding on Stainless Steel

采用等离子喷焊技术,在304不锈钢基体上喷焊Stellite6钴基合金粉末,制备钴基合金喷焊层。利用光学显微镜（OM）、X射线衍射仪（XRD）和扫描电镜（SEM）分析研究了喷焊层组织。利用显微硬度计测试喷焊层的显微硬度,通过环—块磨损试验评估喷焊层的耐磨性。实验结果表明：喷焊层组织均匀细小,主要由γ-Co固溶体和（Cr,Fe）7C3相组成;喷焊层的显微硬度在370～420HV1之间;在室温干滑动磨损条件下,喷焊层失重为基体失重的21.2%,喷焊层的耐滑动磨损性能明显提高。

Co-based alloy coating of Stellite6 powder was deposited on 304 stainless steel by plasma spray welding technology. The microstructure of the spray coating was examined by optical microscope, scanning elec- tron microscope（SEM） and X-ray diffractometer （XRD） . The microhardness of the coating was tested by mi- crohardness tester. The wear resistance performance of the coating was evaluated on a MM--200 block-on- wheel sliding wear tester. The experimental results indicate that the coating has a microstructure consisting of γ-Co supersaturated solid solution and （Cr, Fe）7C3 compound and its microhardness varies between 370 420HV_1. The loss-weight of the coating layer is merely 21.2% of stainless steel substrate. The wear resistance of the coating is enhanced greatly.