| 放电等离子烧结Nb/Nb5Si3原位复合材料 |
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| 引用本文： | 陈哲,王世鑫,严有为. 放电等离子烧结Nb/Nb5Si3原位复合材料[J]. 华中科技大学学报(自然科学版), 2005, 33(12): 22-23,30 |
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| 作者姓名： | 陈哲 王世鑫 严有为 |
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| 作者单位： | 华中科技大学,塑性成形模拟及模具技术国家重点实验室,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金资助项目（50276023）. |
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| 摘 要： | 以Nb，Si粉末为原料，采用放电等离子烧结（SPS）技术，原位合成了密实的Nb／NbsSi3复合材料．利用扫描电镜（SEM）、电子探针微区分析（EPMA）和X射线衍射（XRD）等手段对材料的组织结构进行了分析，并探讨了材料的结构形成机理．结果表明，合成的材料由近球状的Nb颗粒与Nb-Nb5S3共晶组织组成；SPS过程中产生的放电等离子体使Si粉及Nb颗粒的表面熔化，熔融的Nb和Si在冷却过程中发生共晶反应而形成Nb-NbsSi3共晶体，而未反应完的Nb颗粒则均匀分布在共晶组织中．
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| 关 键 词： | 放电等离子烧结 复合材料 微观组织 |
| 文章编号： | 1671-4512（2005）12-0022-02 |
| 收稿时间： | 2005-01-21 |
| 修稿时间： | 2005-01-21 |
Spark plasma sintering of Nb/Nb5Si3 in-situ composites |
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| Chen Zhe,Wang Shixin,Yan Youwei. Spark plasma sintering of Nb/Nb5Si3 in-situ composites[J]. JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE, 2005, 33(12): 22-23,30 |
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| Authors: | Chen Zhe Wang Shixin Yan Youwei |
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| Abstract: | Taken Nb and Si elemental powders as raw materials,dense Nb/Nb_5Si_3 composites were fabricated by a spark plasma sintering(SPS) technology.The microstructures of the synthesized composites were analyzed and their forming mechanisms studied through SEM,XRD and EPMA.The result showed that the composites were consisted of nearly spherical shape Nb particles and Nb-Nb_5Si_3 eutectic.Si elemental powders and the surface parts of Nb particles were melted due to the action of spark plasma,and the Nb-Nb_5Si_3 eutectic was formed by eutectic reaction of the melting of Si and Nb during cooling process.The residual particles of Nb were distributed among the eutectic. |
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| Keywords: | spark plasma sintering composites microstructures |
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