SPS快速烧结制备纳米结构Ti_5Si_3-TiC复合材料

Rapid Fabrication of Nano-structured Ti_5Si_3-TiC Composites by Spark Plasma Sintering

采用金属钛和碳化硅为初始原料,采用放电等离子体快速烧结(SPS)技术制备了致密纳米结构的Ti5Si3-TiC复合材料.借助XRD、SEM和TEM考察了复合材料的相组成和显微结构,利用压痕法测定了其室温显微硬度和断裂韧性.结果表明:利用SPS技术可在1260℃,保温8 min条件下使金属钛和碳化硅同步完成反应、烧结、致密化,生成Ti5Si3-TiC复合材料,并且晶粒细小,其中TiC晶粒尺寸<200nm.

Nano Ti5Si3-TiC composites were in situ fabricated through spark plasma sintering (SPS) technique using Ti and SiC powders without any additive. The phase constituent of the samples was analyzed by X-ray diffraction techniques and microstructures were observed by scanning electron microscope and transmission electron microscope. The fracture toughness at room temperature was also measured by indentation tests. The results show that the Ti5Si3-TiC composite can be fabricated by means of the reactive sintering method in a relatively short time (8 min) and at a lower temperature (1260degreesC), with a fine microstructure (TiC grain size <200nm).