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等离子加热反应合成TiB2-TiC-Fe2Ti复合材料

, PP. 556-562

Keywords: TiB2-TiC-Fe2Ti,复合材料,等离子,反应合成,等离子束电流

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Abstract:

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。

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