以TiC、Ti和Al粉为原材料,采用冷压预成型-热压辅助工艺原位制备Ti3 AlC2陶瓷.借助反应吉布斯自由能分析TiC-Ti-Al体系的合成机制,采用XRD和SEM分析工艺因素如升温速率、Al含量、烧结温度和压坯尺寸对原位合成Ti3 AlC2陶瓷的影响.结果表明,通过调控工艺,成功合成了高纯度Ti3 AlC2陶瓷,Ti3 AlC2具有典型的层状结构.该反应体系的最佳升温速率为:1000℃之前,20℃/min; 1000℃之后,10℃/min.用纳米TiC粉替代微米TiC粉,烧结温度由1450℃降至1350℃,且Ti3 AlC2的合成纯度更高.当采用大尺寸压坯时,发生了“热爆”现象,非平衡相较多,Ti3 AlC2的生成含量较低,且样品开裂严重.Ti3 AlC2的合成过程为:Ti与Al反应生成TiAl金属间化合物,接着TiAl与TiC反应生成Ti3AlC2.
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