利用热压烧结方法原位合成了TiB2-TiC0.8-SiC复相陶瓷.通过光学显微镜(OM)、X射线衍射分析仪(XRD)和扫描电子显微镜(SEM)对材料物相组成和微观结构进行表征.研究了热压条件下烧结温度对材料物相组成、结构及力学性能的影响.结果表明:烧结温度在1700～1950℃范围内,随着温度的升高,材料的致密度、抗弯强度和断裂韧性都有显著改善.烧结温度为1900℃可得到完全致密的原位合成TiB2-TiC0.8-SiC复相陶瓷,材料的晶粒发育比较完善,条状TiB2和块状TiC0.8晶粒清晰可见.复合材料的维氏硬度、断裂韧性和弯曲强度分别达到23.6 GPa,(7.0±1.0) MPa·m1/2和470.9MPa.当温度达到1950℃时,由于增强相TiB2晶粒长大,材料的强度降低.TiB2、TiC0.8与SiC颗粒协同,通过裂纹偏转、晶粒拔出、晶粒细化等机制对复合材料起到颗粒增强增韧的作用.
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