Pd添加による珪化鉄のε+α→β変態と焼結の促進 [in Japanese] Accelerations of ε+α→βTransformation and Sintering of Iron Silicide by Addition of Pd [in Japanese]
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FeSi<SUB>2</SUB>(β phase) semiconducting iron silicide, which is expected to be widely used as a thermoelectric material in high temperature environment, is formed below 1259K by the peritectoid reaction of FeSi(ε) and Fe<SUB>2</SUB>Si<SUB>5</SUB>(α) two metallic phases. Because the transformation of ε+α→β caused by this peritectoid reaction occurs considerably slowly, the iron silicide material which is produced by sintering of the powder at temperatures above 1259K has to be isothermally heat-treated for at least 180ks at about 1120K after the sintering so that the transformation occurs completely.<BR>We have found that the transformation was drastically accelerated by the addition of a small amount of Pd in the same way as Cu; the isothermal heat-treatment time necessary for the completion of the transformation was reduced to about 1/60. The sintering time needed for the almost full densification of the powder by pressure DCL sintering (DCL; direct current loading) was also reduced. A hypothesis for the mechanisms was proposed.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 43(12), 1473-1478, 1996-12-15
Japan Society of Powder and Powder Metallurgy