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锆英石碳热还原合成ZrB2-SiC复合粉体

DOI: 10.7521/j.issn.0454-5648.2014.06.17

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Abstract:

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1773K保温3h,可得到几乎纯相的ZrB2-SiC复合粉体。

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