Improvement and Practical Application of FeSi_2 Thermoelectric Materials with Dispersion of Fine Particles by Liquid Phase Sintering.

液相烧结细颗粒分散FeSi_2热电材料的改进及实际应用。

• 批准号: 10555248
• 负责人: NAGAI Hiroshi
• 金额: $ 7.87万
• 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: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555248/
• 关键词: Thermoelectric materials; mechanical alloying; nano-composite; seebeck coefficient; β-FeSi_2; thermal conductivity; powder metallurgy; liquid phase sintering

The performance of the thermoelectric materials is represented by the figure of merit Z : Z=α^2/ρκ, where α is Seebeck coefficient, ρ is electrical resistivity, and κ is thermal conductivity. In order to obtain a high figure of merit, a large Seebeck coefficient and low electrical resistivity is required, as well as a low thermal conductivity. The effects of liquid phase sintering and dispersion of fine particles on the thermoelectric propeties are investigated in this study. The results obtained are as follows :(1) β-FeSi_2 with dispersion of fine particles are obtained by mechanical alloying (MA) and liquid phase sintering method. (2) β-FeSi_2 with ultra-fine SiC dispersion was obtained by MA of FeSi_2, Si and C powders. The performance was markedly improved by decreasing the thermal conductivity. (3) Electrical resistivity and thermal conductivity of β-FeSi_2 were markedly decreased by the dispersion of metallic phase particles with low resistivity. (4) Cu addition significantly accelerated densification by liquid phase sintering. (5) The figure of merit Z of β-FeSi_2 was markedly improved by the simultaneous addition of SiC and Cu. The figure of merit of FeSi_2-SiC-Cu system was 4 times larger than that of β-FeSi_2 without addition.

热电材料的性能用品质因数Z表示：Z=α^2/ρκ，其中α为塞贝克系数，ρ为电阻率，κ为热导率。为了获得高品质因数，需要大的塞贝克系数和低电阻率以及低热导率。本研究研究了液相烧结和细颗粒分散对热电性能的影响。得到的结果如下：(1)采用机械合金化和液相烧结方法得到了细颗粒弥散的β-FeSi_2。 (2)通过FeSi_2、Si、C粉体的MA制备得到超细SiC分散体的β-FeSi_2。通过降低热导率，性能得到显着提高。 (3)低电阻率金属相颗粒的分散显着降低了β-FeSi_2的电阻率和导热率。 (4) Cu的添加显着加速了液相烧结的致密化。 (5)同时添加SiC和Cu显着提高了β-FeSi_2的品质因数Z。 FeSi_2-SiC-Cu体系的品质因数比未添加的β-FeSi_2大4倍。

项目成果

M.Ito: "Preparation og Iron Disilicide by Sintering with Cu Addition and Their Thermoelectric Properties."Proc. of 18th Intl.Conf. on Thermoelectrics. ICT'99. (In press). (1999)

M.Ito：“通过添加 Cu 烧结制备二硅化铁及其热电性能。”Proc。

永井宏: "Effect of Si/C Ratio on Thermoelectric Properties of β-FeSi^2 Mechanically Alloyed with (Si+C) Additions."Mater.Trans.JIM. 41-2. 287-292 (2000)

Hiroshi Nagai：“Si/C 比例对添加 (Si+C) 机械合金化的 β-FeSi^2 热电性能的影响”Mater.Trans.JIM 41-2 (2000)。

永井宏: "Thermoelectric Properties of β-FeSi_2 Mechanically Alloyed with Si and C."Mater.Trans.JIM. 39-11. 1140-1145 (1998)

Hiroshi Nagai：“Si 和 C 机械合金化的 β-FeSi_2 的热电性能”，Mater.Trans.JIM 39-11（1998 年）。

H.Nagai: "Effects of Mechanical Alloying and Cu Addition on Thermoelectric Propeties of n-type and p-type β-FeSi_2."Mater.Trans.JIM.. 39(4). 515-521 (1998)

H.Nagai：“机械合金化和 Cu 添加对 n 型和 p 型 β-FeSi_2 热电性能的影响”。Mater.Trans.JIM.. 39(4) (1998)。

H.Nagai: "Thermoelectric Properties of β-FeSi_2 with Dispersion of SiC by Mechanical Alloying."Proc. of 17th Intl.Conf. on Thermoelectrics. ICT'98. 374-377 (1998)

H.Nagai：“通过机械合金化分散 SiC 的热电性能”。第 17 届国际热电会议论文集 (1998)。