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自发熔渗法制备TiC/NiAl复合材料和其微观组织特征

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Keywords: 熔化渗透,复合材料,微观组织,碳化钛,镍铝金属间化合物

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Abstract:

用自发熔化渗透法制备高TiC含量(~75vol%)的TiC/NiAl复合材料,研究了渗透温度和渗透时间对TiC/NiAl复合材料微观组织形成、硬度及断裂性能的影响。采用XRD和TEM/EDS分析了复合材料的相组成、微观结构和NiAl相与TiC颗粒在高温渗透过程中的互溶情况。结果表明:自发熔渗法是制备致密的TiC/NiAl复合材料的有效方法,适当提高渗透温度,可大大缩短渗透时间。在完成渗透获得致密组织的前提下,渗透温度和渗透时间对TiC/NiAl复合材料的硬度及断裂韧性无显著影响。NiAl相和TiC颗粒结合良好,是渗透后复合物的仅有组成相。TiC少量地溶于NiAl,溶解度随渗透时间增长而增大,且在TiC颗粒外层,发现有少量的Al和微量的Ni。

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