| Project/Area Number |
10555248
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Material processing/treatments
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| Research Institution | Osaka University |
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Principal Investigator |
NAGAI Hiroshi Materials Sci. Osaka University Professor, 大学院・工学研究科, 教授 (80029206)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Mikio Materials Sci. Osaka University Research Assitant, 大学院・工学研究科, 助手 (00294033)
KATSUYAMA Shigeru Materials Sci. Osaka University Research Assitant, 大学院・工学研究科, 助手 (00224478)
MAJIMA Kazuhiko Materials Sci Osaka University Associate Prof., 大学院・工学研究科, 助教授 (60029270)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥12,300,000 (Direct Cost: ¥12,300,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥8,100,000 (Direct Cost: ¥8,100,000)
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| Keywords | Thermoelectric materials / mechanical alloying / nano-composite / seebeck coefficient / β-FeSi_2 / thermal conductivity / powder metallurgy / liquid phase sintering |
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| Research Abstract |
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.
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