陶器素地の鋳込み性状に及ぼす吸着イオンの影響 : 泥漿鋳込みの研究(第8報)

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By determining the effect of specific base-exchange cations on casting behaviors, H+-, Na+-, K+-, NH4+-, Ca++-, and Mg++- bodies were prepared using a typical japanese pottery body. The calculated mineralogical composition was 45.7% quartz, 11.0% beldspar, 27.0% kaolinite, 11.0% sericite, 2.8% pyrophyllite, and 2.5% dolomite; and exchangeable capacity was 3.2 m.e./100g. Sodium silicate was used as an electrolyte and the water content in body slip was adjusted to indicate Newtonian flow (60% solid). The following properties were carried on these casting slips; consistency, specific gravity, rate-on-cast and retained water, and on cast bodies; drying shrinkage, modulus of rupture, bulk and apparent density, porosity and water absorption.There is a marked relations between casting properties and exchangeable cation, and the most satisfactory cation is Mg++.It is concluded that the determination of exchangeable base should be of considerable aid in the control of casting slips.
1964-04-01