スリップキャスティング法で作製したβ-FeSi_2の最適焼結・焼鈍条件

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Optimum sintering and annealing conditions for iron-disilicide thermoelectric material were determined. The chemical compositions of the starting material were Fe_<0.91>Mn_<0.09>Si_2 and Fe_<0.98>Co_<0.02>Si_2. The mean particle diameter of both powders was about 6μm. The powder concentration was 77 mas %, and the hydrogen exponents(=pH) of Fe_<0.91>Mn_<0.09>Si_2 and Fe_<0.98>Co_<0.02>Si_2 were 8.5 and 7, respectively. The green body was demolded in 1h, and then was dried at 353K for 8h in air. Sintering was performed in the temperature range from 1423 to 1453 K for 3h, and annealing, in the temperature range from 973 to 1143 K for 14h. Vacuum was used for both sintering and annealing. The relative density increased with increasing sintering temperature. The relative density of the Fe_<0.91>Mn_<0.09>Si_2 specimen was higher than of the Fe_<0.98>Co_<0.02>Si_2 specimen, because the solidus temprature of Fe_<0.91>Mn_<0.09>Si_2 is lower than that of Fe_<0.98>Co_<0.02>Si_2. The grain size of the ε-phase in the specimen sintered at 1453 K was much larger than that in the specimen sintered at 1443 K, and is covered with a thick β-phase layer, which restrains the reaction of ε+Si→β. The optimum annealing temperature was at 1123 K, at which the eutectoid reaction, α→β+Si, and the subsequent reaction, ε+Si→β, mainly occurred. Some compacts were formed by cold isostatic pressing(CIP) or uniaxial pressing. Density and thermoelectric properties of the specimen formed by slip casting were better than those prepared by uniaxial pressing and almost the same as those prepared by CIP. Thus, slip casting is regarded as a superior forming method to conventional methods such as CIP and uniaxial pressing.
社団法人日本セラミックス協会の論文
2001-03-01

スリップキャスティング法で作製したβ-FeSi_2の最適焼結・焼鈍条件

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