アルミナ-長石-カオリン系磁器素地の緻密化

概要

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Whiteware bodies composed of 20-50% alumina, 20-50% kaolin and 10-40% feldspar were investigated to study the effects of compositions and firing temperature on the microstructure of fired samples. The vitrification temperature, at which apparent porosity turns to almost zero, lowered with feldspar content. A high relative density of 98% was obtained at 1150℃ for the body containing 40% of feldspar. Furthermore, the temperature range at which a body shows high density was limited, because of the bloating at elevated temperature. Nevertheless, the bloating at elevated temperature was restrained by controlling the ratio of the feldspar and kaolin contents in the range of 1:1 to 1:1.5, independent of the alumina content. It was explained by the increase of viscosity of matrix-glass, due to the dissolution of free silica from kaolin to matrix-glass and due to the formation of interlocking felt-like mullite needles.
社団法人日本セラミックス協会の論文
1992-05-01