场激活合成法制备热电材料β-FeSi<sub>2</sub>

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场激活合成法制备热电材料β-FeSi₂

1. National Key Laboratory for Nuclear Fuel and Materials, Nuclear Power Institute of China, Chengdu, 610041, China;
2. University of California, Davis, CA, US

摘要: 以Fe、Si粉为原料,添加微量Cu,采用场激活的方法一步完成β相FeSi₂的合成、致密和退火。本文分析研究了微量Cu对材料合成速度和显微组织的影响,结果表明:微量Cu能够显著提高材料的合成速度;Cu以白色富集区的形式存在;退火时间对ε相的残留量没有显著影响,但能使长条状的Si富集区的长径比发生变化。
- β相FeSi₂ /
- 场激活法 /
- 微量Cu /
- 退火时间
Abstract: β-phase FeSi₂ was synthesized by Field Activated Method from Fe and Si powder mixture with small addition of Cu. The synthesis, solidification and heat treatment are completed in one step by this method. This paper investigated the effect of small addition Cu on synthesis rate and microstructure. The results show that copper can dramatically increase the phase transformation rate. Holding time do not influence the amount of remainedεphase, but finger shape of Si rich regions changes with the increase of holding time.
- Phase FeSi₂ /
- Field Activated method /
- Small addition of Cu /
- Holding time.