以工业用硅粉、碳粉和碳化钛粉为原料,利用放电等离子烧结技术原位反应制备了TiSi₂-SiC两相复合材料和TiSi₂-SiC-Ti₃SiC₂三相复合材料. 利用XRD、FESEM和TEM对复合材料的相组成和微观结构进行了研究. 结果表明, 基体相TiSi₂的晶粒尺寸在1μm以上, 反应生成的SiC颗粒尺度 在200～300nm, 且均匀弥散分布在TiSi₂基体中. TiSi₂-SiC材料的硬度、断裂韧性和抗弯强度随着SiC含量的增加都有一定程度的提高. Ti₃SiC₂ 三元相的引入大大提高了TiSi₂-SiC-Ti₃ SiC₂复合材料的力学性能. SiC和Ti₂SiC₂的引入对TiSi₂-SiC复合材料在高温下的电导率和热导率影响较小.

TiSi₂-SiC and TiSi₂-SiC-Ti₃SiC₂ composites were in situ fabricated by spark plasma sintering using commercially available Si, Ti, C and TiC as starting materials. The phase constitutes and microstructures of the composites were analyzed by XRD, FESEM and TEM. It shows that the TiSi₂ grains are larger than 1μm and SiC particles in the range of 200--300nm uniformly distribute
in the TiSi₂ matrix. The hardness, fracture toughness and bending strength of TiSi₂-SiC composites increase with the SiC contents increasing. The introduction of Ti₃SiC₂ enhances the mechanical properties of
TiSi₂-SiC-Ti₃SiC₂ composite greatly. In addition, the introduction
of SiC and Ti₃SiC₂ have little effect on the electrical conductivity and thermal conductivity of TiSi₂ -SiC composites tested at the elevated temperature.