原位生成TiC/Ti5Si3纳米复合材料的显微结构研究

摘要

研究了原位生成TiC/Ti5Si3纳米复合材料的显微结构.实验结果表明，以SiC和Ti为原料，通过反应热压工艺可以原位合成TiC/Ti5Si3复合材料，其中的大部分TiC粒子为纳米粒子.TiC晶粒与Ti5Si3晶粒的晶界上存在原子台阶.复合材料还含有少量Ti3SiC2相.这些Ti3SiC2相主要呈棒状分布在Ti5Si3基体中，另有少量Ti3SiC2相位于大的TiC晶粒内.%The microstructure of in situ produced TiC/Ti5Si3 nanocomposite was studied. The results show that TiC/Ti5Si3 nanocomposite can be fabricated by reactively hot pressing the mixed powders of SiC and Ti. Almost TiC grains are nanosized, and there is a small amount of Ti3SiC2 in this nanocomposite. Some elongated Ti3SiC2 grains are located in Ti5Si3 matrix and the rest Ti3SiC2 grains in TiC grains. There is no amorphous phase on the grain boundaries of TiC and Ti5Si3 or TiC and Ti3SiC2. Some monatomic steps can be observed at the grain boundary of TiC and Ti5Si3.