氧乙炔火焰喷涂技术合成并沉积TiC-Fe涂层

A Technique of Synthesis and Deposition of TiC-Fe Coatings by Oxy-acetylene Flame Spraying

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 technique to produce TiC that can enhance wear-resistant coating is put forward. This technique uses the oxy-acetylene flame spraying to ,synthesize and deposit the TiC-Fe material at the same time. First, the solid powder after reaction is turned into spraying powder by polymerization, and then the spraying powder is flowing into the oxy-acetylene flame to react in-situ, finally the production after reaction is impacted to the substrate to form coating. The micro-structure analysis shows that the main phase of the coating is TIC and Fe. In the flying process of the .spraying powder, the reaction between Ti and C is going gradually, and the synthesis reaction of the TIC-Fe material takes place mainly at the distance between 125mm to 170mm. TIC-Fe coating is constructed by rich and poor TiC segments whose micro hardness is at 11.9-13. 7 and 3.0-6.0 respectively. The sub-micron spherical TiC particles are distributed in metal soft matrix. This special micro structure offers the coating with a distinct abrasion resisting quality which is approximately 5 times the quality as the traditional oxy-acetylene flame spraying WC enhanced metal porcelain coating.