机械合金化制备Ti_3AlC_2陶瓷材料的研究

Research on the Fabrication of Ti_3AlC_2 Ceramic Materials by Mechanical Alloying

采用Ti,Al和C元素粉末为反应物原料,通过机械合金化法成功地制备出高含量三元碳化合物Ti_3AlC_2陶瓷粉体。按Ti_3AlC_2化学计量比为起始反应原料配比(Ti:Al:C=3:1:2)的元素混合粉末,经3 h的机械合金化后,Ti、Al和C单质混合粉末发生化学反应,生成以Ti_3AlC_2为主晶相,并含有少量TiC的混合粉体和小块体;粉体中Ti_3AlC_2的含量达到83%(质量分数,下同)。产物合成的原因是在Ti-Al-C体系中发生了一种机械诱发自蔓延反应。

The ternary carbide Ti3AlC2 ceramic powders with high content have been successfully fabricated by mechanical alloying using Ti, Al and C as starting powders. The experimental results show that the mixed powders of Ti, Al and C according to the stoichiometric composition of Ti3AlC2 （Ti：Al：C=3：1：2） induced the chemical reactions after ball milling for 3 h. The powders with Ti3AlC2 as the main phase and a small amount of TiC, and the bulk were formed. The content of Ti3AlC2 in synthesized powders reached 83wt%. The reason for the formation of products is that a mechanically induced self-propagating reaction was triggered during mechanical alloying in the Ti-Al-C system.