TiC掺杂对热压合成Ti_2AlC材料的影响

Effect of TiC addition on synthesis of Ti_2AlC by hot pressing

采用热压工艺合成了Ti2AlC块体材料。在不同温度时,通过X射线衍射分析了掺入不同含量TiC混合粉经热压合成试样的物相组成,并采用SEM观察所合成试样的显微结构。结果发现:完全以元素粉为原料不掺TiC的混合粉经1 500℃热压60 min合成Ti2AlC块体材料,且产物中含有TiC和Ti3AlC2杂相;掺入0.5 mol或1.0 mol TiC混合粉经1 400℃热压60 min后合成不含TiC且只含少量Ti3AlC2的Ti2AlC块体材料。同时,探讨了TiC对合成Ti2AlC块体材料的影响机理。

Ti2 AIC bulk materials were synthesized by hot pressing mixture powders with different contents of TiC addition. X-ray diffractrometry was used to detect the phase composition and scanning electron microscopy （SEM） was used to investigate the microstructures of samples synthesized at different temperatures. The results show that Ti2AlC bulk materials can be synthesized by hot pressing elemental mixture powders without TiC addition at 1 500 ℃ for 60 min, in which TiC and Ti3AlC2 exist as secondary phases. By adding 0.5 mol or 1.0 mol TiC into the raw mixtures, Ti2AlC can be fabricated by hot pressing at 1400℃ for 60 min, and there exist only a small amount of Ti3AlC2 as secondary phase. At the some time, the effect mechanism of TiC on synthesis of Ti2AlC bulk materials were investigated.