爆炸喷涂Cr_3C_2-35NiCr涂层的组织及性能研究  

Characteristic of Cr_3C_2-35NiCr Coating Fabricated by Detonation Gun Spray

作　　者：崔永静[1] 孙晓萍[2] 陈斌 郭孟秋[1] 汤智慧[1] 

机构地区：[1]北京航空材料研究院,北京100095 [2]沈阳发动机设计研究所,沈阳110015 [3]北京新立机械有限公司,北京100039

出　　处：《热喷涂技术》2014年第1期30-34,29,共6页Thermal Spray Technology

基　　金：航空基金项目(20130421001)

摘　　要：采用爆炸喷涂技术(D-gun)制备Cr3C2-35NiCr涂层。采用扫描电子显微镜(SEM)、电子探针(EPMA)、X射线衍射仪(XRD)对涂层微观结构、成分和相组成进行了分析,此外采用光学显微镜、显微硬度仪、拉伸试验机、摩擦磨损试验机等设备分别对涂层的孔隙率、硬度、断裂韧度、结合强度、磨损性能和热震性能进行了测试分析。试验结果表明:爆炸喷涂制备的Cr3C2-35NiCr涂层孔隙率为0.52%,显微硬度为HV803,断裂韧度为4.55MPa?m0.5,结合强度大于87.5MPa;涂层磨损性能和热震性能的测试结果表明,Cr3C2-35NiCr涂层室温摩擦系数为0.6,经受750℃下50次热震(水冷试验)无剥落。Cr3C2-35NiCr coating was fabricated by detonation gun spray （D-gun） technology. Microstructure, composition, porosity, micro-hardness, fracture toughness, bond strength, sliding wear performance of the coating were investigated by scanning electric microscope （SEM）, optical microscopy, micro-hardness tester, mechanical and sliding testing machine respectively. The results showed that porosity of Cr3C2-35NiCr coating was 0.52%, micro-hardness was HV803, fracture toughness was 4.55 MPa·m0.5, bond strength was higher than 87.5MPa; In addition, friction coefficient of the coating was 0.6 and no peels were detected in thermal shock test.

关 键 词：爆炸喷涂 结合强度 滑动磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]