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依据Cr-Al-C三元系热力学数据库,计算了合成Cr2AlC过程中的相平衡关系。基于相平衡关系,以合成温度、保温时间、原料类型及原料配比为变量设计了合理的正交试验,并采用热压方法制备了高单相含量的Cr2AlC材料。通过正交试验参数回归,优化出最佳工艺参数,同时发现原料类型为最敏感参数,采用Cr7C3代替单质Cr,C元素粉末作为原料,有利于获得更高单相含量的Cr2AlC材料。通过体系在不同温度下的反应产物,对合成Cr2AlC化合物过程中的反应路径有了较清晰的认识。
Based on the Cr-Al-C ternary thermodynamic database, the phase equilibrium in the synthesis of Cr2AlC was calculated. Based on the phase equilibrium relationship, a reasonable orthogonal experiment was designed based on the synthesis temperature, holding time, raw material type and raw material ratio as variables. Cr2AlC material with high single-phase content was prepared by hot pressing. Through the orthogonal experimental parameters regression, the optimum process parameters were optimized. At the same time, the most sensitive parameters were found. The Cr7C3 was used instead of the Cr and C elements powders as the raw materials, which was in favor of obtaining higher single-phase Cr2AlC materials. Through the system reaction products at different temperatures, the synthesis of Cr2AlC compounds in the process of the reaction path has a clearer understanding.