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以锆英石、氧化硼、活性炭为原料,采用碳热还原合成工艺制备了ZrB2—SiC复合粉体,并对合成过程进行了热力学分析。考察了反应温度及原料配比对碳热还原合成ZrB2—SiC复合粉体的物相的组成、含量和显微结构的影响。结果表明:提高反应温度有利于ZrB2—SiC复合粉体的合成,适当过量氧化硼及活性炭有利于ZrB2—SiC复合粉体的合成。合成ZrB2—SiC复合粉体的最优参数为:当ZrSiO4、B2O3和C的摩尔比为1∶2∶12,在1 773K保温3h,可得到几乎纯相的ZrB2—SiC复合粉体。
ZrB2-SiC composite powder was prepared by carbothermal reduction synthesis using zircon, boron oxide and activated carbon as raw materials, and the thermodynamic analysis of the synthesis was carried out. The effects of reaction temperature and the ratio of raw materials on the composition, content and microstructure of ZrB2-SiC composite powders synthesized by carbothermal reduction were investigated. The results show that increasing the reaction temperature is beneficial to the synthesis of ZrB2-SiC composite powders. Appropriate excess boron oxide and activated carbon are beneficial to the synthesis of ZrB2-SiC composite powders. The optimal parameters of ZrB2-SiC composite powders were ZrB2-SiC composite powders with nearly pure phase when the molar ratio of ZrSiO4, B2O3 and C was 1: 2: 12 and kept at 1 773K for 3h.