添加TiAl对燃烧合成Ti3AlC2粉体的影响

Effects of TiAl Additions on Combustion Synthesis of Ti3AlC2 Powders

摘要:

采用Ti，Al和C粉末为反应物原料，研究了添加金属间化合物TiAl对燃烧合成Ti3AlC2的影响。从动力学和热力学的角度探讨了TiAl对燃烧合成Ti3AlC2的影响机理。实验结果表明，仅以单质粉末Ti，Al和碳黑为原料，按Ti3AlC2化学计量比配料，燃烧产物的主要物相是TiC，只能得到少量Ti3AlC2相，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TiAl(20％-35％)(质量百分数)后，燃烧合成产物中Ti，AlC2的含量显著增加，成为燃烧产物的主要物相，而TiC的含量则显著减少。燃烧产物中Ti3AlC2的含量随添加TiAl量的增加而显著增多。

Abstract:

The effect of intermetallic compound TiAl additions on the combustion synthesis of Ti3AlC2 powder from Ti, Al and C as starting powders has been studied. The experimental results show that the main phase of the combustion product is TiC with very small amount of Ti3AlC2, if the molar ratio of Ti, Al, C is equal to 3:1:2. However, Ti3AlC2 become the main phase with a small amount of TiC if a small amount of TiAl is added to the starting mixtures without changing the overall stoichiometry. The fraction of Ti3AlC2 increases with increasing additions of TiAl to the starting mixtures. The above experimental phenomena were explained through thermodynamic and kinetic analysis.