Influence of Dehydration Rate on the Degree of Particle Orientation in Alumina Green Body Made by Slip Casting

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  • スリップキャスト法で作製したアルミナ成形体の粒子配向度に及ぼす脱水速度の影響

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Orientation structure of particles was evaluated quantitatively by an optical method based on polarized light microscopy in an alumina green body prepared by slip casting method using porous alumina and plaster mold. The dehydration rate in the alumina mold was higher than that of the plaster mold. The alumina particles in the green body were always orientated parallel to the surface of the mold. The degree of orientated particles was affected by the dehydration rate during development of the cake. The degree of orientation in the alumina mold system was higher than in plaster mold system for rapid dehydration. The highest degree of particle orientation was obtained at regions near the mold, which was developed at the beginning stage of slip casting. The degree of orientation was explained by the dehydration rate in the mold system.<br>

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