| Ti-W-C体系的自蔓延高温合成与反应机理 |
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| 引用本文： | 李劲风,郑子樵,张昭,何国新,陶小风.Ti-W-C体系的自蔓延高温合成与反应机理[J].粉末冶金技术,2000,18(2):83-87. |
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| 作者姓名： | 李劲风 郑子樵 张昭 何国新 陶小风 |
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| 作者单位： | 1. 中南工业大学, 长沙 410083; |
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| 摘 要： | 研究了Ti-W-C体系自蔓延高温合成(SHS)的燃烧温度和燃烧速度与W含量、Ti粉粒度及预热温度的关系。分析了不同W含量和预热温度时SHS产物的相组成,并对体系的SHS反应机理进行了研究。结果表明:W/(Ti+W)≤ 0.3时,基本能合成单相(W/Ti)C;而预热可促进(W,Ti) C的SHS合成;体系的SHS反应过程中存在两种反应机制,即溶解-析出机制和扩散-固溶机制
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| 关 键 词： | Ti-W-C体系 自蔓延高温合成 反应机制 |
| 收稿时间： | 1999-04-14 |
SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS AND REACTION MECHANISM IN Ti-W-C SYSTEM |
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| Li Jinfeng,Zheng Ziqiao,Zhangzhao,He Guoxin,Tao Xiaofeng.SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS AND REACTION MECHANISM IN Ti-W-C SYSTEM[J].Powder Metallurgy Technology,2000,18(2):83-87. |
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| Authors: | Li Jinfeng Zheng Ziqiao Zhangzhao He Guoxin Tao Xiaofeng |
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| Affiliation: | 1. Central South University of Technology, Changsha 410083;2. Zhuzhou Cemented Carbide Plant, Zhuzhou 412000 |
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| Abstract: | The effects of W content, Ti powder size and preheating temperature on combustion temperature and combustion velocity in SHS of Ti-W-C system were investigated. The phase components of SHS products were examined. The reaction mechanism was studied. Uniphase (W,Ti)C can be synthesized without being preheated in the condition of W/(Ti+W)≤0.3. Preheating mixtures can accelerate the formation of (W,Ti)C. There are two reaction mechanisms in SHS reaction process, which are solution-precipitation and diffusion-solution in solid state respectively. |
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| Keywords: | Ti-W-C system SHS Reaction mechanism |
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