共熔法制备二硼化钛基复合材料的研究

Titanium Boride Based Ceramic Matrix Composites Made by Eutectic Method

采用共熔法制备二硼化钛基复合材料,两组样品初始组份分别为TiB2、SiC及鳞片石墨,TiB2、TiC、SiC与鳞片石墨。研究表明,共熔法制备的复合材料中各相分散均匀,产物中的石墨高度有序,石墨层间距分别为0.3385 nm与0.3367 nm,且微晶厚度分别为60.8 nm及46.7 nm;拉曼光谱峰形及参数表明石墨的网格结构中掺杂有硼元素;TiB2基复合材料样品中孔隙率分别为12.5%与13.8%,热导率分别为41.0 W/(m K)与52.9 W/(m K)。

Titanium boride based ceramic matrix composites were firstly made by eutectic method from either the mixture of TiB2, SiC and flake graphite, or that of TiB2, TiC, SiC and flake graphite. Results show that different phases distributed uniformly in these composites, and the graphite phases in the composites were highly ordered. The d 002 values of the graphite in the composites were 0.3385 nm and 0.3367 nm, and the Lc values were 60.8 nm and 46.7 nm, respectively. Boron was already doped into the carbon net, as indicated by the Raman analysis. Some amount of pores existed in the composites, with the porosity of 12.5% and 13.8%, respectively. Also, thermal conductivity coefficients of the composites were 41.0 W/(m K) and 52.9 W/(m K). Eutectic method could be a promising method for making titanium boride based ceramic matrix composites.