Ti-B4C反应机理和扩散路径的研究

无机材料学报, 2000, 15(5): 884-888. doi: 10.3321/j.issn:1000-324X.2000.05.020

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 ^3, , 苗赫濯 ^4,

1.北京航空材料研究院，北京 100095

2.清华大学，北京 100084

3.清华大学，北京 100084

4.清华大学，北京 100084

关键词： TiB2 , TiC , 扩散偶

Diffusion Path and Reaction Mechanism between Ti and B4C

Keywords： TiB2 , TiC , diffusion couples

利用差热分析和XRD分析确定了Ti与B4C发生化学反应的温度和1600C保温0.5h后的物相组成，通过Ti-B4C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/TiB2/B4C，在扩散偶中Ti?B4C作为反应相始终存在，生成物中TiB2，TiB和TiC三相同时存在，而对于粉料烧结后只有TiB2和TiC两相.

The beginning temperature of chemical reaction between Ti and B4C and the production phase after 妔oaking 0.5h at 1600C 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 1600C.

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