在CuCrZr合金表面等离子喷涂Cr3C2-NiCr涂层、NiAl/Cr3C2-NiCr复合涂层.测试涂层与基体间的结合强度及涂层的热震性能,结合SEM,EDS和XRD等分析涂层物相变化,探讨涂层的结合机理.结果表明,涂层的结合强度均较高;Ni-Al发生放热反应,生成Al4Ni3,Al3Ni2,AlNi3,剩余的铝与铜反应生成Cu3Al2,CuAl2,CuAl,局部区域形成微冶金结合;二种涂层均以机械锚合为主,在参数适合且基体相同的情况下,涂层结合强度取决于涂层材料的力学性能;相同试验条件下,NiAl/Cr3C2-NiCr复合涂层的热震性能优于Cr3C2-NiCr涂层.%The Cr3C2-NiCr,NiAl/Cr3C2-NiCr coatings were prepared by plasma spraying on the CuCrZr alloy.The bonding strength between the coating and the substrate and the thermal shock resistance were tested.The change of the phases and the coating bonding mechanism were investigated by means of SEM,EDS,XRD.The results show all coatings have good bonding strength.During the process of spraying the NiAl coating,an exothermic reaction generates between Ni and Al,and three kinds of intermetallics（Al4Ni3,Al3Ni2,AlNi3） are formed.The remaining Al can react with Cu substrate to form Cu3Al2,CuAl2 and CuAl,hence,the micro-metallurgical bond exists in some micro-zones.However,the bond type is mainly mechanical bond for all coatings.The bonding strength depends on the mechanical properties of the coating material,under the conditions of the same substrate and appropriate parameters.The thermal shock resistance of NiAl/Cr3C2-NiCr coating is better than that of Cr3C2-NiCr coating.
展开▼
