用热爆反应合成法研究了Ａｌ／ＴｉＣ复合体系中粉料粒度对ＴｉＣ热爆反应合成规律的影响．结果表明：粉料粒度对反应的起始温度Ｔｉｇ没有影响，但对反应温度和反应时间有一定的影响。另外，通过ＳＥＭ观察了反应合成ＴｉＣ的组织和形貌及粉料粒度对它的影响。试验表明：粉料的粒度对反应合成ＴｉＣ的大小、形貌没有影响。合成的ＴｉＣ具有亚微米尺寸（约为０．３μｍ），且表面光滑干净，大部分呈圆整的球状。 The effect of powder particle size on the synthesis of TiC thermal detonation reaction in Al / TiC composite system was studied by thermal explosion reaction method. The results showed that the particle size did not affect the starting temperature Tig, but had some influence on the reaction temperature and reaction time. In addition, the microstructure and morphology of TiC synthesized by reaction and the effect of particle size on the microstructure were observed by SEM. The results show that the size of the powder has no effect on the size and morphology of the synthesized TiC. The synthesized TiC has a submicron size (about 0.3 μm), and the surface is smooth and clean, mostly spherical.