高纯V_2AlC的无压烧结制备及表征  

Synthesis and characterization of high purity V_2AlC prepared by pressureless sintering

作　　者：高少华 缪奶华 周健[1] GAO Shaohua, MIAO Naihua, ZHOU Jian(School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, Chin)

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《北京航空航天大学学报》2018年第4期868-873,共6页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金(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V_2AlC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Na F对烧结过程的影响。实验结果表明,在1300~1500℃温度区间内V_3Al_2、C和VC发生反应生成V_2AlC相,且无压烧结制备高纯V_2AlC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Na F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(40~100μm)的V_2AlC可用做提高材料耐磨性的增强体以及二维材料V_2C的前驱体。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 Na F 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 1500℃ for 2 h. In addition,the use of sintering aid Na F 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.

关 键 词：MAX相 V2AlC 无压烧结 反应路径 烧结助剂 

分 类 号：V254.2[一般工业技术—材料科学与工程] TQ127.1[航空宇航科学与技术—航空宇航制造工程]