镍基和钴基合金喷熔涂层的抗汽蚀性能研究  

Research on Cavitation Erosion Resistance of Spraying and Fusing Co-based and Ni-based Coatings

作　　者：丁彰雄[1] 王群[2] 陈振华[2] 张世英[3] 赵刚[1] 

机构地区：[1]武汉理工大学能源与动力工程学院,湖北武汉430063 [2]湖南大学材料科学与工程学院,湖南长沙410082 [3]长沙大学生物工程与环境科学系,湖南长沙410003

出　　处：《湖南大学学报（自然科学版）》2008年第1期66-70,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(50479016)

摘　　要：采用氧乙炔火焰喷熔法在Q235钢表面制备了镍基和钴基合金涂层.利用光学显微镜(OM)和X射线衍射仪(XRD)对涂层进行了组织和相结构分析,测试了涂层的硬度和抗汽蚀性能,并利用扫描电子显微镜(SEM)对两种涂层的汽蚀形貌进行了观察,探讨了镍基和钴基喷熔层的汽蚀破坏机理.实验结果表明:镍基和钴基喷熔层都优于常用于水利机械的抗汽蚀马氏体不锈钢ZG06Cr16Ni5Mo(16-5钢),适用于对水利机械零件进行修复和预防护.Ni-based and Co-based alloy coatings were made on the Q235 steel substrate by oxy-acetylene flame spraying and fusing. The microstructure and the phase structure of the coatings were analyzed by optical microscope（OM） and X-ray diffraction（XRD）. The Rockwell hardness and cavitation erosion morphologies of the tested coatings were examined, and the cavitation erosion mechanisms were also discussed. The experimental results have indicated that Co-based and Ni-based alloy sprayed and fused coatings can provide a promising method to enhance the cavitation erosive resistance of hydro-machine components, and are suitable for repairing and protecting hydro-machine components from cavitation erosion, since their cavitation erosion resistance are better than hydro-machine material ZG06Cr16Ni5Mo（16-5） martensite stainless steel.

关 键 词：汽蚀 涂层 喷熔 钴基合金 镍基合金 

分 类 号：TG174.442[金属学及工艺—金属表面处理]