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为了研究预热温度对TiC/Ni功能梯度涂层的影响,利用自蔓延高温合成结合准热等静压技术(SHS/PHIP),在H13钢表面制备了TiC/Ni梯度功能涂层,采用XRD和SEM-EDS对涂层的物相结构进行分析,采用显微硬度计测定涂层的表面硬度及界面结合性能。结果表明,涂层的主要物相为颗粒状TiC和包裹在TiC周围的Ni基固溶体;涂层为多孔骨架结构;随着预热温度升高,涂层表面孔隙率降低,致密度、TiC晶粒尺寸和表面硬度值增大,涂层与基体之间元素扩散增强,冶金结合强度提高。
In order to study the effect of preheating temperature on the TiC / Ni functional gradient coating, TiC / Ni gradient functional coatings were prepared on the surface of H13 steel by SHS / PHIP, and characterized by XRD And SEM-EDS analysis of the phase structure of the coating, the use of micro-hardness tester to measure the surface hardness and interface bonding properties. The results show that the main phase of the coating is granular TiC and Ni-based solid solution wrapped around TiC. The coating is porous skeleton structure. With the preheating temperature increasing, the porosity of the coating surface decreases. The density, Increasing the particle size and surface hardness, the element diffusion between the coating and the matrix increases, and the metallurgical bond strength increases.