自蔓延高温合成高纯Ti_3AlC_2

Fabrication of high purity Ti_3AlC_2 by self-propagating high-temperature synthesis

以Ti、Al、C单质粉末为原料,通过高温自蔓延制备高纯的Ti3AlC2材料,研究钛碳比、铝含量及添加助剂Si对Ti3AlC2合成的影响,利用XRD和SEM研究该材料的物相组成和显微结构。结果表明:Si元素的加入显著促进了Ti3AlC2的合成;钛碳比及Al的相含量对Ti3AlC2的形成有很大影响,合适的钛碳比和适当过量的Al有利于提高粉体中Ti3AlC2的含量;通过K-值法估算Ti3AlC2的纯度,以3Ti/1.2Al/2C/0.3Si粉体为原料经高温自蔓延获得了质量分数达92.6%的Ti3AlC2粉体。

Using Ti, A1 and C powders as raw materials, the high purity Ti3A1C2 materials were prepared by self-propagating high- temperature synthesis doping with Si. The phase composition and mierostructure were analyzed by XRD and SEM. The results show that adding appropriate content Si can obviously accelerate the synthesis of Ti3A1C2. The ratio of titanium/carbon and relative content of A1 have a great influence on the formation of Ti^A1C2, the proper titanium/carbon ratio and the appropriately excessive A1 are favorable to the formation of Ti3A1C2. Ti3A1C2 powder content of 92.6% was obtained by high temperature self- propagating with 3Ti/1.2A1/2C/0.3Si powder as raw material.