无机材料学报

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Ti-B4C反应机理和扩散路径的研究

唐建新1; 程继红2; 曾照强2; 苗赫濯2   

  1. 1. 北京航空材料研究院, 北京 100095; 2. 清华大学, 北京 100084
  • 收稿日期:1999-09-20 修回日期:1999-10-12 出版日期:2000-10-20 网络出版日期:2000-10-20

Diffusion Path and Reaction Mechanism between Ti and B4C

TANG Jian-Xin1; CHENG Ji-Hong2; ZENG Zhao-Qiang2; MIAO He-Zhuo 2   

  1. 1.Institute of Aeronautical Materials; Beijing 100095; China; 2. Tsinghua University; Beijing 100084; China
  • Received:1999-09-20 Revised:1999-10-12 Published:2000-10-20 Online:2000-10-20

摘要: 利用差热分析和XRD分析确定了Ti与BC发生化学反应的温度和1600℃保温0.5h后的物相组成,通过Ti-BC扩散偶对反应机理进行了研究,实验结果表明在反应过程中扩散路径是:Ti/TiC/TiB/TiB/BC,在扩散偶中Ti与BC作为反应相始终存在,生成物中 TiB, TiB和 TiC三相同时存在,而对于粉料烧结后只有 TiB和TiC两相.

关键词: TiB2, TiC, 扩散偶

Abstract: The beginning temperature of chemical reaction between Ti and B4C and the production phase after soaking 0.5h at 1600℃ were determined by DT and XRD, respectively. The mechanism of chemical reaction was studied by the diffusion couples of Ti-B4C. It shows that the diffusion path is Ti/TiC/TiB/TiB2/B4C and the (TiB2+TiC+TiB) triple phases coexist in the Ti-B4C diffusion couples. However, there exist two phases of TiB2 and TiC for the powders of Ti+B4C sintered at 1600℃.

Key words: TiB2, TiC, diffusion couples

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