| Li_3N在生成BN反应中的作用 |
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| 引用本文： | 徐晓伟,刘志甫,林前哨,李玉萍.Li_3N在生成BN反应中的作用[J].高压物理学报,2001(1). |
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| 作者姓名： | 徐晓伟 刘志甫 林前哨 李玉萍 |
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| 作者单位： | 北京科技大学无机非金属材料系!北京100083 |
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| 基金项目： | 国家自然科学基金资助项目! (59972 0 0 3) |
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| 摘 要： | 研究了常压高温下Li3N在B4 C与含氮化合物生成BN反应中的作用。实验结果表明 ,在 950℃高温下 ,B4 C与Si3N4 反应不生成hBN ,B4 C与NH4 Cl反应只生成少量hBN。在该两种原料中加入Li3N后 ,反应产物中hBN的生成量都明显增多。但Li3N本身没有与B4 C生成hBN的反应。由此推断 ,Li3N在上述B4 C与含氮化合物生成hBN的反应中表现出了催化作用。此外 ,在以hBN为原料 ,以Li3N为催化剂合成出cBN的温度压力区域内 ,对B4 C Si3N4 Li3N体系所做的高温高压实验没有合成出hBN或cBN。还讨论了在低压条件下原位合成cBN的探索实验中 ,应如何选择硼源和氮源的问题
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| 关 键 词： | 氮化锂 碳化硼 氮化硅 氯化铵 氮化硼 |
Li_3N FUNCTION IN BN SYNTHESIS |
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| XU Xiao wei,LIU Zhi fu,LIN Qian shao,LI Yu pingKHmmDWTBX.Li_3N FUNCTION IN BN SYNTHESIS[J].Chinese Journal of High Pressure Physics,2001(1). |
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| Authors: | XU Xiao wei LIU Zhi fu LIN Qian shao LI Yu ping[KHmmD][WTBX] |
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| Affiliation: | XU Xiao wei,LIU Zhi fu,LIN Qian shao,LI Yu ping[KH+3mmD][WT5BX] |
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| Abstract: | Li 3N functions in the reactions between B 4C and nitrogen containing compounds were investigated under high temperature.Experimental results showed that no hBN formed from the reaction between B 4C and Si 3N 4,and only small amount of hBN formed from the reaction between B 4C and NH 4Cl.After Li 3N was added into starting materials,the amount of hBN formed from both reactions increased obviously.The reaction between Li 3N and B 4C did not form hBN.All the results gave the conclusion that Li 3N acted as catalyst in the reaction between B 4C and nitrogen containing compounds.No hBN or cBN was obtained from B 4C Si 3N 4 Li 3N system after a high temperature and high pressure treatment.The rule of choosing B source and N source for cBN synthesis at lower pressure also is discussed.WT5HZ] |
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| Keywords: | Li 3N B 4C Si 3N 4 NH 4Cl BN |
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