| 原位合成Mo5SiB2的热力学分析 |
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| 引用本文： | 张来启,黄蕾.原位合成Mo5SiB2的热力学分析[J].北京科技大学学报,2008,30(3):281-284. |
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| 作者姓名： | 张来启 黄蕾 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 北京科技大学科研基金资助项目“新型钼硼硅化物超高温结构材料的研究”(No20041004790) |
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| 摘 要： | 计算了Mo-Si-B三元系中各化合物不同温度下标准生成自由焓和合成Mo5SiB2(T2相)反应在不同开始温度下的绝热温度及反应产物的熔化比.结果表明:用Mo、Si和B三种元素粉末混合物来原位合成Mo5SiB2在热力学上是完全可行的;合成Mo5SiB2不宜用燃烧合成的自蔓延模式,宜采用燃烧合成的热爆模式(原位反应热压工艺);反应的绝热温度及反应产物的熔化比与开始温度有关.
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| 关 键 词： | Mo-Si-B三元系 多相合金 原位合成 自蔓延高温燃烧合成 热力学 |
| 修稿时间： | 2006年12月25 |
Thermodynamic analysis for the synthesis of Mo5SiB2 |
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| ZHANG Laiqi,HUANG Lei.Thermodynamic analysis for the synthesis of Mo5SiB2[J].Journal of University of Science and Technology Beijing,2008,30(3):281-284. |
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| Authors: | ZHANG Laiqi HUANG Lei |
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| Abstract: | The standard formation free energies at different temperatures of compounds in a Mo-Si-B ternary system were calculated. The adiabatic temperatures and the molten ratios of Mo5SiB2 (T2 phase) at different initial temperatures for the reaction of synthesizing Mo5SiB2 were obtained. The results showed that it was feasible to synthesize in-situ Mo5SiB2 from the elemental powders. Mo5SiB2 could not be synthesized using the SHS (self-propagating high-temperature synthesis) mode of combustion. In contrast, the explosion mode of combustion (in-situ reactively hot-pressing) was acceptable. The adiabatic temperature and the molten ratio of Mo5SiB2 were relative to the initial temperature. |
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| Keywords: | Mo-Si-B ternary system multiphase alloy in-situ synthesis self-propagating high-temperature synthesis thermodynamics |
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