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采用超重力场燃烧合成技术,通过液态陶瓷与1Cr18Ni9Ti之间的熔化连接,在1Cr18Ni9Ti基底上制备出具有成分扩散特征的TiC-TiB2陶瓷涂层。XRD、FESEM及EDS分析表明陶瓷涂层由大量细小的TiB2片晶、TiC不规则晶体及少量的Cr基合金相构成,并且陶瓷涂层相对密度、显微硬度及断裂韧性分别达到98.2%、24.6GPa与(14.5±3.5)MPa·m0.5。在1Cr18Ni9Ti基底与陶瓷涂层之间因出现Ti、Cr与C原子向不锈钢基底的单程扩散,使得陶瓷与不锈钢之间存在着富(Fe,Ti)合金碳化物颗粒呈梯度分布的中间过渡层,同时受超重力所限,中间过渡层存在粗大的氧化物夹杂与氧化物夹杂层,致使陶瓷涂层与不锈钢之间的剪切强度仅达到(125±35)MPa。
The TiC-TiB2 ceramic coating with composition diffusion was prepared on 1Cr18Ni9Ti substrate by melt bonding between liquid ceramic and 1Cr18Ni9Ti by super gravity field combustion synthesis. XRD, FESEM and EDS analysis show that the ceramic coating consists of a large number of small TiB2 lamellae, TiC irregular crystals and a small amount of Cr-based alloy phase, and the relative density, microhardness and fracture toughness of the ceramic coating reach 98.2% and 24.6 GPa and (14.5 ± 3.5) MPa · m0.5. Due to the single-pass diffusion of Ti, Cr and C atoms to the stainless steel substrate between the 1Cr18Ni9Ti substrate and the ceramic coating, an intermediate transition layer with gradient distribution of the (Fe, Ti) -containing carbide particles exists between the ceramic and the stainless steel, At the same time, it is limited by the super gravity, and there is coarse oxide inclusions and oxide inclusions in the middle transition layer, resulting in a shear strength of (125 ± 35) MPa between the ceramic coating and the stainless steel.