| Citation: | GAO Shaohua, MIAO Naihua, ZHOU Jianet al. Synthesis and characterization of high purity V2AlC prepared by pressureless sintering[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(4): 868-873. doi: 10.13700/j.bh.1001-5965.2017.0295(in Chinese)
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In this paper, we reported the synthesis of high purity V2AlC by pressureless sintering with V, Al and C mixed powders. The reaction paths were studied and discussed according to the phase transformation at different sintering temperatures. Besides, the effect of sintering aid NaF on singtering process was stuied. The experimental results show that V2AlC was synthesized by the reaction of V3Al2, VC and C within the temperature range of 1 300-1 500℃ and that high purity V2AlC could be obtained with the optimized molar ratio of V:Al:C=2:1.2:1 at 1 500℃ for 2 h. In addition, the use of sintering aid NaF could greatly promote the reaction process and reduce the reaction temperature to 1 400℃. Based on the high purity and suitable size distribution (40~100 μm), the synthesized powders can be easily used as the reinforcement material or V2C precursor material.
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