中文摘要：

采用Si作为烧结助剂，利用热压烧结技术烧结制备了SiB6-B4C陶瓷复合材料。采用热力学计算、XRD物相分析，结合SEM图片，探讨了Si-B4C陶瓷的烧结过程和机理。结果表明：Si有助于促进B4C陶瓷的致密化烧结，原位生成的SiB6有助于B4C陶瓷机械性能的提高；Si的最佳加入量为10wt％；预烧处理对Si-B4C陶瓷烧结有利，1000～1400℃预烧8h后制备的B4C陶瓷弯曲强度447．3MPa，断裂韧性4．42MPa·m1/2，HRA硬度为94。

英文摘要：

SiB6-B4C ceramic composites were fabricated by hot-pressed sintering technology using Si as sintering aids. The sintering process and mechanism of Si-B4C ceramics were studied by theoretical calculation, XRD and SEM. The results indicate that Si performances a significant effect on B4C ceramics density sintering and the in-situ generated SiB6 could improve the mechanical properties of B4C ceramics. The optimal addition of Si is 10wt%. Pre-sintering process is benefit for Si-B4C ceramics sintering. The flexural strength, fracture toughness and HRA hardness of B4C ceramics reached 447.3 MPa, 4.42 MPa m1/2 and 94 separately when they were pre-sintered at 1000-1400℃ for 8 h.