Development and Application of High Performance Thermoelectric Materials by Powder Metallurgical Procedure Using Mechanical Alloying.

采用机械合金化的粉末冶金工艺开发和应用高性能热电材料。

• 批准号: 06555212
• 负责人: NAGAI Hiroshi
• 金额: $ 9.02万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555212/
• 关键词: Thermoelectric materials; beta-FeSi_2; mechanical alloying; nano-composite; thermoelectric power; electrical resistivity; thermal conductivity; powder metallurgy; メカニカルアイロニング; 粉末冶金; 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 epsilon-phase and 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 phases 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.

结果表明：1）机械合金化（MA）使ε相和ZrSi（金属相）或SiC（绝缘相）分散，提高了β-FeSi 2的热电性能;结果表明，SiC颗粒的分散降低了β-FeSi_2的晶粒尺寸和热导率，金属相的分散降低了电阻率，并使β-FeSi_2与Si和碳颗粒进行MA，得到了SiC颗粒分散度为20- 30 nm的β-FeSi_2。SiC微粒的分散可降低β-FeSi_2的导热系数kappa，但不影响热电势Q和电阻率ρ。3）Zr的加入可显著降低β-FeSi_2的电阻率，提高其热电性能，尤其是在高温下。

项目成果

H.Nagai: "Thermoelectric Properties of FeSi_2 with SiC Dispersion Prepared by Mechanicalk Alloying." J.Jpn.Soc.Powder & Powder Met.43(5). 608-612 (1996)

H.Nagai：“Mechanicalk 合金化制备的具有 SiC 分散体的 FeSi_2 的热电性能。”

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 β-FeSi_2 热电性能的影响”。

H.Nagai: "Preparation of High Performane FeSi_2 Thermoelectric Material by using Mechanical Alloying." Materia Japan. 35(9). 952-955 (1996)

H.Nagai：“利用机械合金化制备高性能 FeSi_2 热电材料”。

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: "n型Fe_<0.98>Co_<0.02>Si_2の熱電特性に及ぼすAl添加の影響" 粉体および粉末冶金. 42. 1328-1332 (1995)

Hiroshi Nagai：“Al添加对n型Fe_<0.98>Co_<0.02>Si_2热电性能的影响”粉末与粉末冶金42。1328-1332（1995）