不同钛碳摩尔比和铝含量对Ti－Al－C体系燃烧合成Ti3AlC2粉体的影响

Effects of Different Ti/C and Al Contents on Combustion Synthesized Ti3AlC2 Powders in the Ti-Al-C System

摘要:

以Ti，Al，C和TiC粉末为原料，研究了钛碳摩尔比和Al含量对Ti—Al—C体系燃烧合成产物相组成的影响。实验表明，不同的钛碳摩尔比和Al含量变化，对Ti-Al—C体系燃烧合成Ti3AlC2粉体有很大影响。当Ti／C=1或1．5时，燃烧产物主晶相是TiC，与原料中Al含量变化关系不大；Ti／C=2和Ti／C=3时，主晶相分别是Ti3AlC2和Ti2AlC，它们的衍射峰强度均分别随原料中Al含量增加而增强，当Al含量增加到一定量后，Ti3AlC2和Ti2AlC的衍射峰强度均又减弱；TiC是Ti-Al-C体系燃烧合成Ti3AlC2相的中间产物。

Abstract:

The effect of Ti/C (molar ratio) and Al content on phase constitution of combustion synthesized products by using Ti,Al,C and TiC powders as raw materials in the Ti Al C system has been studied. The experiment results show that the phase formation of combustion synthesized Ti3AlC2 powders are affected greatly by molar ratio of titanium to carbon and Al content in the raw materials. TiC is the main phase in the final product as the molar ratio of titanium to carbon is equal to 1 or 1.5, with little relationship to the amount of aluminum content. The Ti3AlC2 and Ti2AlC are the main phases in the final product as the molar ratio of titanium to carbon are equal to 2 and 3, respectively. Moreover, amounts of Ti3AlC2 and Ti2AlC increase in direct ratio with Al content, and later decrease with continuously increasing amount of Al. TiC is a medium product during the combustion process for the purpose of obtaining Ti3AlC2 powders.