Ti-B_4C反应机理和扩散路径的研究  

Diffusion Path and Reaction Mechanism between Ti and B_4C

作　　者：唐建新[1] 程继红[2] 曾照强[2] 苗赫濯[2] 

机构地区：[1]北京航空材料研究院,北京100095 [2]清华大学,北京100084

出　　处：《无机材料学报》2000年第5期884-888,共5页Journal of Inorganic Materials

摘　　要：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１６００℃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与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 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℃.

关 键 词：扩散偶 二硼化钛 碳化钛 结构陶瓷 结构 

分 类 号：TQ174.758[化学工程—陶瓷工业]