マグネシア質ポーラス焼結体の組織変化に及ぼす骨材粒子径と焼成温度の影響

概要

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Changes in the structure and physical properties of porous magnesia ceramic containing TiO_2-Al_2O_3 matrix with TiO_2-Al_2O_3 molar ratio 0.96 and 15 wt% content were studied at different sizes and firing temperatures for controlling the pore shape. The shape of pore was complicated depending on the grain size and firing temperature, and pores were found to have a fractal nature. While the fractal dimension increased with increasing firing temperature for small grains, it decreased with increasing firing temperature for large grains. The fractal dimension of each MgO grain size tends to converge at a lower firing temperature which is close to the temperature at which the MgAl_2O_4-Mg_2 TiO_4 solid solution is formed. Specimens with small grains were found to shrink on firing, but the expansion was observed for large grained specimens. These phenomena were explained by the densification and molar volume of MgAl_2O_4-Mg_2TiO_4 solid solution and CaTiO_3 formed. From the above facts, it was possible to controll the pore shape by grain size and firing temperature.
社団法人日本セラミックス協会の論文
1992-02-01