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中文摘要：
以Zr，B4C，Si粉为起始原料，利用放电等离子烧结（SPS）技术，在1450℃，30MPa，保温3min的条件下快速反应烧结制备得到相对致密度约为98．5％的ZrB2-SiC复合材料。制备得到的复合材料硬度约为17．2GPa，断裂韧性约为4-3MPa·m^1/2。通过对SPS过程中不同阶段试样的分析，探讨了复合材料的形成过程。结果表明：当温度达到950℃时，通过X射线衍射（XRD）观察到中间相ZrxSiy的出现，此时主相为ZrB2．随着SPS过程的进行，反应不断发生，当温度约为1250℃时，反应基本结束。
英文摘要：
Using the mixture of Zr, Si and B4C powder as starting materials, the ZrB2-SiC composites were synthesized under 30 MPa at 1450℃ for 3min by spark plasma sintering technique （SPS）. Dense ZrB2-SiC composites with the relative density 98.5% were successfully fabricated. The Vickers hardness （HV10） of the composites was 17.2GPa, and the fracture toughness was 4.3 MPa.m^1/2. The reaction process of the composites was also investigated by analyzing the samples at different moments. The results show that when sintering temperature reaches 950℃, intermediate phase ZrxSiy can be observed by XRD, meanwhile the main phase is ZrB2. The amount of Zr/Siy decreased with increasing of sintering temperature until 1250℃, at which temperature Zr/Siy could not be observed by XRD.
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