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采用真空热压法制备出铁基表面Ni3Al涂层、TiC/Ni3Al涂层及TiC/Ni3Al-Ni3Al双层涂层,研究了不同涂层的微观结构及相组成,并用洛氏硬度计对涂层剖面进行了硬度测试。结果表明:TiC/Ni3Al-Ni3Al双层涂层结合了Ni3Al涂层、TiC/Ni3Al涂层两者的优点。表层涂层的微观组织为TiC颗粒较为均匀的分布在Ni3Al基体上,组织纯净、致密,过渡层Ni3Al相与表层涂层及钢基体之间均为良好的冶金结合。TiC/Ni3Al-Ni3Al双层涂层既维持了TiC/Ni3Al涂层的高硬度,又实现了从表层至基体之间性能的梯度过度。
The Ni3Al coating, TiC / Ni3Al coating and TiC / Ni3Al-Ni3Al coating were prepared by vacuum hot pressing. The microstructure and phase composition of different coatings were studied. Profile hardness test. The results show that TiC / Ni3Al-Ni3Al dual-layer coating combines the advantages of both Ni3Al coating and TiC / Ni3Al coating. The microstructure of the surface coating is that TiC particles are distributed uniformly on the Ni3Al matrix, the microstructure is pure and compact, and the metallurgical bonding between the Ni3Al phase and the surface coating and the steel matrix is good. The TiC / Ni3Al-Ni3Al dual-layer coating not only maintains the high hardness of the TiC / Ni3Al coating, but also realizes the gradient of the performance from the surface layer to the substrate.