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采用热爆合成技术制备TiC/Ni3Al复合材料,通过DSC,XRD,SEM等分析手段对Ti-C-3Ni-Al体系热爆反应过程及复合材料进行了研究。结果表明:Ni,Al在反应生成Ni3Al的同时引发了Ti和C之间生成TiC的反应,形成了纯净的TiC/Ni3Al复合产物,Ti-C-3Ni-Al体系的反应温度与TiC含量无关。热爆产物的微观组织形貌跟体系成分及热爆温度有关,TiC含量愈高,TiC颗粒粒度愈大,热爆产物中微观孔隙愈少;TiC颗粒的粒度随热爆温度的升高而增大,形状从近球形发育成多边形。热爆产物的致密度随着TiC含量增加及热爆温度的升高均表现出先增加后减小的变化趋势。当TiC含量为35%左右,热爆温度为750℃左右时,产物致密度最高。不同成分复合材料的显微硬度不同,TiC含量增加,复合材料显微硬度显著提高。
The TiC / Ni3Al composites were prepared by thermal explosion technique. The thermal explosion process and the composites of Ti-C-3Ni-Al system were studied by means of DSC, XRD and SEM. The results show that Ni and Al react with each other to produce Ni3Al and initiate TiC reaction between Ti and C to form a pure TiC / Ni3Al composite product. The reaction temperature of Ti-C-3Ni-Al system is independent of TiC content. The microstructure of the hot explosion products is related to the composition of the system and the hot detonation temperature. The higher the TiC content is, the larger the TiC particle size is and the smaller the microscopic pores in the hot explosion product. The particle size of the TiC particles increases with the increase of the hot detonation temperature Large, shape from nearly spherical to polygons. The densification degree of hot explosion products shows a trend of first increasing and then decreasing with the increase of TiC content and the increase of hot detonation temperature. When the content of TiC is about 35%, the thermal detonation temperature is about 750 ℃, the highest product density. The microhardness of different composites is different, TiC content increases, the microhardness of the composite material significantly increased.