Low temperature synthesis of ZrB2-SiC powders by molten salt magnesiothermic reduction and their oxidation resistance
Low temperature synthesis of ZrB2-SiC powders by molten salt magnesiothermic reduction and their oxidation resistance
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熔盐镁热还原低温合成ZrB2-SiC粉末及其抗氧化性能
DOI：
10.1016/j.ceramint.2018.10.191
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发表时间：
2019-05
影响因子：
5.2
通讯作者：
Shaowei Zhang
中科院分区：
文献类型：
--
作者：
Faliang Li;Cao Tan;Jianghao Liu;Junkai Wang;Quanli Jia;Haijun Zhang;Shaowei Zhang
本文采用熔盐还原法制备了含镁的ZrSiO_4/B_2O_3/活性碳复合粉末。结果表明，烧成温度、B：Z、C：Si摩尔比以及过量的镁含量对上述复合粉末的物相组成和形貌均有影响。值得注意的是，在1 2 0 0 °C下烧成3 h，即比常规碳热还原温度低至少2 0 0 °C，可获得相纯的、质量比为~75：2 5的ZrB_2-SiC粉末。所制备的ZrB_2-SiC复合材料的颗粒尺寸为几个微米，且由均匀分布在ZrB_2基质中的碳化硅纳米颗粒组成。氧化活化能分别为326m ol/ 和381m ol/m ol，说明碳化硅的引入提高了块体材料的抗氧化性。
Herein, we prepare phase-pure ZrB2-SiC composite powders by molten-salt-mediated reduction of ZrSiO4/B2O3/activated carbon mixtures with Mg, showing that the phase composition and morphology of the above composites is influenced by firing temperature, B:Zr and C:Si molar ratios, and the amount of excess Mg. Notably, phase-pure ZrB2-SiC powder with a ZrB2:SiC weight ratio of ~75:25 could be obtained by 3-h firing at 1200 °C, i.e., at a temperature lower than that used for conventional carbothermal reduction by at least 200 °C. As-prepared ZrB2-SiC composites exhibited grain sizes of several microns and comprised SiC nanoparticles well distributed in the ZrB2matrix. Finally, the oxidation activation energies of the prepared ZrB2and ZrB2-SiC powders were determined as 326 and 381 kJ/mol, respectively, which demonstrated that the introduction of SiC improved the oxidation resistance of monolithic ZrB2.
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