北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (4): 868-873.doi: 10.13700/j.bh.1001-5965.2017.0295

• 论文 • 上一篇    下一篇

高纯V2AlC的无压烧结制备及表征

高少华, 缪奶华, 周健   

  1. 北京航空航天大学材料科学与工程学院, 北京 100083
  • 收稿日期:2017-05-10 出版日期:2018-04-20 发布日期:2018-04-27
  • 通讯作者: 周健 E-mail:jzhou@buaa.edu.cn
  • 作者简介:高少华,男,硕士研究生。主要研究方向:MAX相材料的制备及应用;周健,男,博士,副教授,硕士生导师。主要研究方向:金属间化合物、热电材料、计算材料。
  • 基金资助:
    国家自然科学基金(51571008)

Synthesis and characterization of high purity V2AlC prepared by pressureless sintering

GAO Shaohua, MIAO Naihua, ZHOU Jian   

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2017-05-10 Online:2018-04-20 Published:2018-04-27
  • Supported by:
    National Natural Science Foundation of China (51571008)

摘要: 采用无压烧结的方法,以V、Al、C混合粉末为原料制备V2AlC粉体材料。通过不同烧结温度下物相的演变过程对反应路径进行研究,同时探究了烧结助剂NaF对烧结过程的影响。实验结果表明,在1 300~1 500℃温度区间内V3Al2、C和VC发生反应生成V2AlC相,且无压烧结制备高纯V2AlC的最佳工艺为1 500℃保温2 h,元素摩尔配比为 V:Al:C=2:1.2:1。此外,烧结助剂NaF的使用加快了反应过程,并使得反应温度降至1 400℃。实验得到的高纯度、颗粒尺寸分布适中(40~100 μm)的V2AlC可用做提高材料耐磨性的增强体以及二维材料V2C的前驱体。

关键词: MAX相, V2AlC, 无压烧结, 反应路径, 烧结助剂

Abstract: 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.

Key words: MAX phase, V2AlC, pressureless sintering, reaction path, sintering aid

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