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用X射线衍射仪、扫描电镜、显微硬度计和摩擦磨损试验机研究了采用氩弧熔覆技术制备的TiC-Ni3Si/Ni基复合涂层的组织与性能。结果表明,氩弧熔覆的TiC-Ni3Si/Ni基复合涂层主要由TiC、Ni3Si、γNi(Fe)过冷奥氏体相组成,TiC硬质颗粒和以TiC为核心原位生成的Ni3Si相弥散分布在镍基粘结相中。显微硬度和摩擦磨损实验表明,TiC-Ni3Si/Ni基复合涂层平均显微硬度9.457 GPa,是基体平均显微硬度的4.78倍,在常温干滑动磨损条件下,TiC-Ni3Si/Ni基复合涂层磨损量约为同等摩擦磨损条件下Q235钢磨损量的11.84%。
The microstructure and properties of TiC-Ni3Si / Ni-based composite coatings prepared by argon arc cladding were investigated by X-ray diffraction, scanning electron microscopy, microhardness tester and friction and wear tester. The results show that the arc-clad TiC-Ni3Si / Ni-based composite coatings consist mainly of TiC, Ni3Si and γNi (Fe) supercooled austenite phases, and TiC hard particles and in-situ Ni3Si phase Dispersed in the nickel-based binder phase. The experimental results of microhardness and friction and wear show that the average microhardness of TiC-Ni3Si / Ni composite coatings is 9.457 GPa, which is 4.78 times of the average microhardness of TiC-Ni3Si / Ni composite coatings. Under dry sliding wear condition at room temperature, The wear amount of the coating is about 11.84% of that of the Q235 steel under the same friction and wear conditions.