Development and Mechanism of High Performance Thermoelectric Materials by Dispersion of Fine Particles

细颗粒分散高性能热电材料的开发及机理

• 批准号: 07455289
• 负责人: NAGAI Hiroshi
• 金额: $ 4.93万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455289/
• 关键词: Thermoelectric materials; beta-FeSi_2; mechanical alloying; nano-composite; thermoelectric power; electrical resistivity; thermal coductivity; powder metallurgy; 焼結材料

The performance of the thermoelectric materials is represented by the equation of Z=Q^2/rhokappa, where Q is thermoelectric power, rho is electrical resistivity, and kappa is thermal conductivity.The results obtained are as follows :1) Dispersion of ZrSi (metallic phase) or SiC (insulator) by mechanical alloying (MA) improved the thermoelectric properties of beta-FeSi_2. It was found that the dispersion of SiC particles decreased the grain size of beta-FeSi_2 and thermal conductivity, kappa, and the dispersion of metallic phase decreased the electrical resistivity, rho.2) beta-FeSi_2 with dispersion of fine SiC particles (20-30nm) was obtained by MA of FeSi_2 with Si and carbon particles. Dispersion of SiC fine particles increased the performance of beta-FeSi_2 by decreasing thermal conductivity kappa without changes in thermoelectric power Q and electrical resistivity rho.3) Addition of Zr significantly increased the themoelectrical performance of beta-FeSi_2 by decreasing the electrical resistivity especially at high temperatures.

热电材料的性能用方程Z=Q^2/rhokappa表示​​，其中Q为热电势，rho为电阻率，kappa为热导率。得到的结果如下：1）ZrSi的色散（通过机械合金化（MA）改善了β-FeSi_2的热电性能。研究发现，SiC 颗粒的分散降低了 β-FeSi_2 的晶粒尺寸和热导率 kappa，金属相的分散降低了电阻率 rho.2) β-FeSi_2 与细 SiC 颗粒的分散 (20- 30nm)是通过FeSi_2与Si和碳颗粒的MA获得的。 SiC细颗粒的分散通过降低热导率kappa而提高了β-FeSi_2的性能，而热电势Q和电阻率rho没有变化。3）Zr的添加通过降低电阻率（特别是在高温下）显着提高了β-FeSi_2的热电性能。温度。

项目成果

永井 宏: "MG法によるCu添加β-FeSi_2焼結体の作製と熱電特性" 粉体および粉末冶金. 42. 151-155 (1995)

永井浩：“MG法制备添加Cu的β-FeSi_2烧结体及其热电性能”《粉末与粉末冶金》42. 151-155 (1995)。

永井宏: "β-FeSi_2の熱電特性に及ぼすTi, Zr, Nb添加の影響" 粉体および粉末冶金. 44・1. 34-38 (1997)

永井浩：“添加 Ti、Zr 和 Nb 对 β-FeSi_2 热电性能的影响”粉末与粉末冶金 44・1 (1997)。

永井宏: "メカニカルアロイング法を活用した各種機能性材料の高性能化" 金属. 65・11. 1037-1044 (1995)

永井浩：“利用机械合金化方法改善各种功能材料的性能”金属65・11（1995）。

"Preparation and Thermoelectric Properties of Sintered beta-FeSi_2 doped with Cu by MG" J.Jpn.Soc.Powder & Powder Met.42(2). 151-155 (1995)

“MG掺杂Cu烧结β-FeSi_2的制备及其热电性能”J.Jpn.Soc.Powder

H.Nagai: "Effect of Ti, Zr and Nb Addition on Thermoelectric Properties of beta-FeSi_2" J.Jpn.Soc.Powder & Powder Met.44(1). 34-38 (1997)

H.Nagai：“Ti、Zr 和 Nb 添加对 beta-FeSi_2 热电性能的影响”J.Jpn.Soc.Powder