MA法によりSiCを分散したFeSi_2の熱電特性 Thermoelectric Properties of FeSi_2 with SiC Dispersion Prepared by Mechanical Alloying

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Thermoelectric properties of β-FeSi<SUB>2</SUB> with SiC dispersion prepared by mechanical alloying were investigated. The FeSi<SUB>2</SUB> alloys doped with Mn or Co (p-type Fe<SUB>0.92</SUB>Mn<SUB>0.08</SUB>Si<SUB>2</SUB>, n-type Fe<SUB>0.98</SUB>Co<SUB>0.02</SUB>Si<SUB>2</SUB>) were prepared by arcmelting in Ar. Mixtures of these FeSi<SUB>2</SUB> alloys with Si+C powders were mechanically alloyed for 72ks, and hot pressed at 1173K for 3.6ks under 25MPa. XRD showed that β-FeSi<SUB>2</SUB> and SiC were formed during hot pressing Si+C addition had little influence on the thermoelectric power of β-FeSi<SUB>2</SUB>. 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-FeSi<SUB>2</SUB>. SiC phase restrained the growth of β-FeSi<SUB>2</SUB> 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=α<SUP>2</SUP>/(ρ⋅k), where α : thermoelectric power, ρ : resistivity, K : thermal conductivity, of Fe<SUB>0.92</SUB>Mn<SUB>0.08</SUB>Si<SUB>2</SUB> added 5wt.% Si+C is higher than that of Fe<SUB>0.92</SUB>Mn<SUB>0.08</SUB>Si<SUB>2</SUB> without Si+C addition. As a result, it is effective to add Si+C to p-type Fe<SUB>0.92</SUB>Mn<SUB>0.08</SUB>Si<SUB>2</SUB>.

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, 1996-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012174
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    3967169
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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