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以Ti、B4C和Fe粉为原料,采用等离子束加热反应合成TiB2-TiC-Fe2Ti复合材料,分析了其物相、组织结构、显微硬度和断口形貌等。结果表明:反应生成物中物相主要有TiB2、TiC和Fe2Ti,同时含有少量的Fe3C。各物相以不同的形态均匀分布,TiB2呈现六边形和长条形,TiC近似球形,Fe2Ti作为粘结相存在于TiB2和TiC相之间,促进了各相之间的结合。等离子束加热具有高加热及冷却速率,降低了晶粒生长时间,有利于获得细小的组织。随着电流增加,单位时间内输入坯体热量增多,TiB2和TiC充分长大,各相之间结合更加紧密。
The TiB2-TiC-Fe2Ti composites were synthesized by plasma beam heating reaction using Ti, B4C and Fe powders as raw materials, and their phases, microstructure, microhardness and fracture morphology were analyzed. The results show that there are mainly TiB2, TiC and Fe2Ti phases in the reaction product, and a small amount of Fe3C. Each phase is uniformly distributed in different forms. TiB2 is hexagonal and elongated. TiC is approximately spherical. Fe2Ti exists as a binder phase between TiB2 and TiC phase, which promotes the combination of phases. Plasma beam heating has a high heating and cooling rate, reducing the grain growth time, is conducive to obtaining small organizations. As the current increases, the heat input per unit body increases, TiB2 and TiC fully grown, the combination between each phase more closely.