ＭＡ法によりＳｉＣを分散したＦｅＳｉ２の熱電特性

• 永井 宏

  大阪大学工学部材料物性工学科

• 永井 謙一

  大阪大学大学院

• 勝山 茂

  大阪大学工学部材料物性工学科

• 真島 一彦

  大阪大学工学部材料物性工学科

書誌事項

タイトル別名

• Thermoelectric Properties of FeSi2 with SiC Dispersion Prepared by Mechanical Alloying.
• MAホウ ニ ヨリ SiC オ ブンサンシタ FeSi2 ノ ネツデン トクセ

抄録

Thermoelectric properties of β-FeSi₂ with SiC dispersion prepared by mechanical alloying were investigated. The FeSi₂ alloys doped with Mn or Co (p-type Fe_0.92Mn_0.08Si₂, n-type Fe_0.98Co_0.02Si₂) were prepared by arcmelting in Ar. Mixtures of these FeSi₂ alloys with Si+C powders were mechanically alloyed for 72ks, and hot pressed at 1173K for 3.6ks under 25MPa. XRD showed that β-FeSi₂ and SiC were formed during hot pressing Si+C addition had little influence on the thermoelectric power of β-FeSi₂. On the other hand, the resistivity increased with increasing Si+C addition. The thermal conductivity drastically decreased by about 30% with increasing Si+C addition in all temperature range. This is considered to be due to the SiC dispersion in β-FeSi₂. SiC phase restrained the growth of β-FeSi₂ phase and phonons scattering at grain boundaries increased, therefore thermal conductivity decreased. SEM photographs showed that 10-20μ m SiC particles dispersed in the β-phase. The figure of merit, Z=α²/(ρ⋅k), where α : thermoelectric power, ρ : resistivity, K : thermal conductivity, of Fe_0.92Mn_0.08Si₂ added 5wt.% Si+C is higher than that of Fe_0.92Mn_0.08Si₂ without Si+C addition. As a result, it is effective to add Si+C to p-type Fe_0.92Mn_0.08Si₂.

収録刊行物

• 粉体および粉末冶金

  粉体および粉末冶金 43 (5), 608-612, 1996

  一般社団法人 粉体粉末冶金協会

キーワード

• β-FeSi<SUB>2</SUB>
• mechanical alloying
• thermoelectric power
• resistivity
• thermal conductivity

詳細情報

• CRID: 1390282681284213376
• NII論文ID: 10002012174
• NII書誌ID: AN00222724
• DOI: 10.2497/jjspm.43.608
• ISSN: 18809014
• ISSN: 05328799
• NDL書誌ID: 3967169
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3967169
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可