高温固相反应合成硼化钨粉体
Preparation of Tungsten Boride Powder by High-Temperature Solid-State Reaction
查看参考文献12篇
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文摘
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以硼和钨为原料在真空碳管炉中进行高温合成硼化钨,研究了B/W摩尔比、温度及合成时间对产物的影响。采用XRD、SEM 对产物的物相组成与微观形貌进行分析,结果表明:当B/W摩尔比为2时产物主要为WB与WB_2,当B/W摩尔比增加至2.5,且温度在1400 ℃以上可以得到纯度较高的WB_2;当B/W摩尔比大于4时,产物主要为WB_2与WB_4,WB_4的相对含量随反应时间的延长而增加。根据产物的形貌,物相组成和能谱分析建立了WB_4的合成路径示意图。 |
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其他语种文摘
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Through a solid-state reaction, tungsten borides were synthesized from boron and tungsten powders under vacuum in a graphite element furnace. In particular, the effects of B/W mole ratio, the temperature and the holding time on the products were investigated. The phase composition and morphology of the product were further analyzed by XRD and SEM, respectively. The result shows that the main products are WB and WB_2 when the B/W ratio is controlled to be 2; however, when the ratio is increased to 2.5 above 1400 C WB_2 of high purity can be obtained. With the B/W ratio more than 4 the main products are mixed by both WB_2 and WB_4. The relative content of WB_4 is increased with prolonging the annealing time. The model of WB_4 formation process has been discussed. |
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来源
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稀有金属材料与工程
,2014,43(8):1987-1990 【核心库】
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关键词
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硼化钨
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固相合成
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微观结构
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地址
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1.
东北大学, 辽宁, 沈阳, 110819
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沈阳飞机设计研究所, 辽宁, 沈阳, 110819
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1002-185X |
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学科
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冶金工业 |
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基金
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国家自然科学基金
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中央高校基本科研业务费
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文献收藏号
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CSCD:5234870
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