スリップキャスティング法における鉄ケイ化物の成形条件

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Optimal slip conditions for molding of iron-disilicide 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 diameters of both kinds of powder were approximatedly 6 μm. The slip were prepared by adding distilled water to the powder, then, the hydrogen exponent (=pH) of the slips was controlled by adding 3% aqua ammonia. Ammonium alginate was used as a deflocculant as well as a binder. When the pH was greater than 7 for the Fe_<0.98>Co_<0.02>Si_2 slip and greater than 8.5 for the Fe_<0.91>Mn_<0.09>Si_2 slip, the apparent viscosity was low enough to enable casting. The pHs of the Fe_<0.98>Co_<0.02>Si_2 slip and the Fe_<0.91>Mn_<0.09>Si_2 slip were determined to be 7 and 8.5, respectively, because a higher pH slip corroded the plaster faster. Although the apparent viscosity increased with the powder concentration, castability was satisfied and the density of the sintered specimen did not depend on the powder concentration under the slip and sintering conditions of this study. Accordingly, the powder concentration was determined to be 77%, because the apparent viscosity of the slip was the lowest at this concentration. The shrinkage of the specimen before and after sintering was 17.1±0.3% and was independent of both the powder concentration and starting material. The ammonium alginate provided stability to the slip and improved the strength of the green body.
社団法人日本セラミックス協会の論文
2001-01-01

スリップキャスティング法における鉄ケイ化物の成形条件

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