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提出了一种简单方便、可用于制备 TiC 增强耐磨涂层的技术方法。该技术利用氧乙炔火焰喷涂,在合成 TiC-Fe 材料的同时沉积该材料。首先,固体反应粉末经团聚制备成喷涂粉末,这种反应喷涂粉末被引入到氧乙炔焰流中而发生原位反应;反应产物被冲击到基底上而形成涂层。微观结构分析表明,涂层的主相为 TiC 和 Fe。在喷涂粉末飞行过程中,Ti 和 C 之间的反应逐步进行,TiC-Fe 材料的合成反应主要发生在喷涂距离为125～170 mm 处。TiC-Fe 涂层由交替的富 TiC 和贫 TiC 片层构成,这两种片层的微观硬度分别为11.9～13.7 GPa 和3.0～6.0 GPa。涂层中亚微米大小的球形 TiC 颗粒分布在金属软基体上。这种特殊的微观结构使该涂层具有优异的耐磨性能,其耐磨性接近传统氧乙炔火焰喷涂 WC 增强金属陶瓷涂层的5倍。
A simple and convenient method for preparing TiC reinforced wear-resistant coating is proposed. This technique utilizes oxyacetylene flame spray to deposit the material while synthesizing the TiC-Fe material. First, the solid reaction powder is prepared as a spray powder by agglomeration. The reaction powder is introduced into the oxyacetylene flame stream to react in situ. The reaction product is impacted onto the substrate to form a coating. Microstructure analysis shows that the main phase of the coating is TiC and Fe. During the spraying of the powder, the reaction between Ti and C proceeded step by step. The synthesis reaction of TiC-Fe mainly took place at a spraying distance of 125-170 mm. TiC-Fe coatings consist of alternating TiC rich and TiC poor TiC-Fe coatings with microhardness of 11.9-13.7 GPa and 3.0-6.0 GPa, respectively. The submicron-sized spherical TiC particles in the coating are distributed on a metal soft substrate. This special microstructure gives the coating excellent wear resistance with five times the wear resistance of conventional oxyacetylene flame-sprayed WC-reinforced cermet coatings.