TiAl_3对燃烧合成Ti_3AlC的影响

Effects of TiAl_3 Addition on Combustion Synthesis of Ti_3AlC

以单质粉末Ti，Al和碳黑为原料，研究了添加金属间化合物TiAl3对燃烧合成Ti3AlC的影响。实验结果表明，仅以单质粉末Ti，Al和碳黑为原料，按Ti3AlC化学计量比配料，燃烧产物主要物相是Ti2AlC和TiC，无Ti3AlC。但在保持原料配比不变的情况下，在反应物原料中添加金属间化合物TiAl3（0～23．5％，质量分数）后，可得到Ti3AlC相物质，其含量随TiAl3的增加而显著增多，成为燃烧产物的主要物相之一。从动力学和热力学角度探讨了TiAl3对燃烧合成Ti3AlC的影响机理。

Using Ti, Al and C powders as starting materials, the effect of intermetallic compound TiAl3 addition on the combustion synthesis of Ti3AlC has been studied. The experiment results show that the main phase of the combustion product involves Ti2AlC and TiC without Ti3AlC, if the molar ratio of Ti, Al, C is equal to 3：1：1. However, the product Ti3AlC is produced by combustion synthesis if a small amount of TiAl3 is added to the starting mixtures without changing the overall stoichiometry. The Ti3AlC becomes the main phase in the final product upon adding 23.5% TiAl3 （mass fraction） in the raw mixtures. The amount of Ti3AlC increases with increasing of addition of TiAl3 in the raw mixtures. The above experimental phenomena were explained through thermodynamic and kinetic analysis.