| 引用本文: | 马运柱,石玉斌,刘文胜,李静.氧化还原法制备钨晶须及其生长机理研究[J].材料科学与工艺,2012,20(3):117-120.DOI:10.11951/j.issn.1005-0299.20120323. |
| MAYun-zhu,SHI Yu-bin,LIU Wen-sheng,LI Jing.Preparation and growth mechanism of tungsten whiskers fabricated by oxidation-reduction method[J].Materials Science and Technology,2012,20(3):117-120.DOI:10.11951/j.issn.1005-0299.20120323. |
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| 摘要: |
| 研究了钨晶须的制备工艺，并分析了其生长机理.采用X射线衍射、扫描电镜、能谱分析、透射电镜对制备的钨晶须进行物相、形貌、成分、微观结构的分析和表征.研究表明：钨晶须长度大致在1～10 μm，直径在1 μm以下，部分达到纳米级；晶须为单晶bcc结构，生长方向为<110>；钨晶须形成过程为钨粉及其氧化产物与水汽反应生成气相水合物WO2(OH)2，遇氢气还原后形核并沉积，进而定向生长为晶须结构，钨晶须的生成遵循VS机理. |
| 关键词: 钨晶须 氧化还原 化学气相迁移 VS机理 |
| DOI：10.11951/j.issn.1005-0299.20120323 |
| 分类号:TG146 |
| 基金项目:国家自然科学基金资助项目(50774098) |
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| Preparation and growth mechanism of tungsten whiskers fabricated by oxidation-reduction method |
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MAYun-zhu, SHI Yu-bin, LIU Wen-sheng, LI Jing
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State Key Laboratory of Powder Metallurgy，Central South University，Changsha 410083，China
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| Abstract: |
| Tungsten whiskers were prepared and the growth mechanism was studied in the paper.X-ray diffraction、Scanning electron microscope、Energy dispersive spectrometer and Transmission electron microscope were used to analyze phase、appearance、element contents and microstructure，respectively.The results show that the produced tungsten whiskers have a length of 1～10 μm,a diameter of less than 1 μm.The whiskers grow along <110> direction with complete bcc crystal structure.The formation process of tungsten whiskers may be described as follows:first,tungsten powder and oxidation products turn into gas hydrate WO2(OH)2 under the effect of water vapor;second,WO2(OH)2 is reduced to tungsten by H2;then,the reduced tungsten nucleates and deposits to be the structure of whisker,so the tungsten whisker growth follows VS mechanism. |
| Key words: tungsten whisker oxidation-reduction chemical vapor transfer VS mechanism |
