Si 含量对放电等离子烧结原位Nb/ Nb<sub>5</sub>Si<sub>3</sub>复合材料显微结构的影响

严有为; 陈哲; 傅正义

Si 含量对放电等离子烧结原位Nb/ Nb₅Si₃复合材料显微结构的影响

1.
华中科技大学模具技术国家重点实验室, 武汉 430074;
2.
武汉理工大学材料复合新技术国家重点实验室, 武汉 430070

基金项目: 国家自然科学基金(No. 50276023) 资助项目

详细信息

通讯作者:
严有为,博士后,副教授,主要从事SHS技术及原位复合材料方面的研究 E-mail:wutpds@public.wh.Hb.cn

中图分类号: TB331
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出版历程
- 收稿日期: 2004-04-15
- 修回日期: 2004-06-30
- 刊出日期: 2005-04-14

INFLUENCE OF Si CONTENT ON THE MICROSTRUCTURES OF IN-SI TUNb/ Nb₅Si₃ COMPOSITES FABRICATED BY SPARK PLASMA SINTERING

1.
State Key Laboratory of Die &|Mould Technology, Huazhong Universityof Science and Technology, Wuhan 430074, China;
2.
State Key Laboratory of Advanced Technology for Materials Synthesis &|Processing, Wuhan University of Technology, Wuhan 430070, China

摘要

摘要: Nb/ Nb₅Si₃ 是一种新型的高温结构复合材料, 为了降低该材料的制备成本并有效控制材料的显微结构, 本文作者以Nb、Si 粉末为原料, 采用放电等离子烧结(SPS) 技术原位合成了近理论密度的Nb/ Nb₅Si₃ 复合材料, 着重研究了Si 含量对Nb/ Nb₅Si₃ 复合材料显微结构的影响。结果表明: 制备的复合材料由合成的Nb₅Si₃和均匀分布的Nb 颗粒组成; 在原子分数为6 %～20 %Si 范围内, 随着Si 含量增加, 复合材料中Nb₅Si₃ 数量增加, Nb 颗粒尺寸减小, 复合材料的致密性和硬度提高。
- Nb/ Nb₅Si₃ 复合材料 /
- 原位合成 /
- 放电等离子烧结(SPS) /
- 显微结构
Abstract: Nb/ Nb₅Si₃ is a new high temperature st ructural composite and has great application potentials in manyfields. In order to decrease the fabricating cost of Nb/ Nb₅Si₃ composite and to efficiently cont rol it s microst ructure ,spark plasma sintering (SPS) technology was used to in2si tu synthesize Nb/ Nb₅Si₃ composites from a mixture of Nband Si powders , and the effect of Si content on the microst ructures of the fabricated composites was mainly investi2gated. The result s show that fully dense Nb/ Nb₅Si₃ composites can be fabricated by SPS technology , and the micrO₂st ructures of the composites consist of the in2si tu synthesized Nb₅Si₃ and the dispersed Nb particles. Moreover , withthe increasing of Si content from 6 % to 20 %(atom f raction) , the volume f raction of the synthesized Nb₅Si₃ in thecomposites increases , whereas the content and size of Nb particles decrease obviously. As a result , the density andhardness of the composites are both improved.
- Nb/ Nb₅Si₃ composite /
- in-situ synthesis /
- spark plasma sintering (SPS) /
- microst ructure