【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。更多还原

【Abstract】 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.更多还原