在热力学分析的基础上,以TiH2粉、Si粉、石墨粉与B4C粉为原料,采用热压烧结法原位合成制备了(TiB2+TiC)/Ti3SiC2复相材料.采用X射线衍射、扫描电镜与透射电镜对材料的物相组成和显微结构进行了表征,研究了烧结温度对材料物相组成、烧结性能、力学性能与显微结构的影响.结果表明,1400～1600℃烧结温度范围内均能获得致密的(TiB2+TiC)/Ti3SiC2复合材料.随着烧结温度的升高,复合材料的强度、断裂韧性与显微硬度均逐渐提高,1500～1600℃烧结所得复合材料具有优化、微细的显微结构,抗弯强度与断裂韧性均分别高于700MPa与9MPa·m1/2,显微硬度为7.33～8.31GPa.原位合成的柱状TiB2与等轴状TiC协同作用,通过颗粒增强、裂纹偏转、晶粒拔出、晶粒细化等机制对Ti3SiC2基体起到了显著的补强增韧效果.
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