磁器の透光度におよぼす滑石添加の影響 (第1報)

磁器の透光度と微構造

抄録

Specimens of porcelain bodies containing various contents of talc (ref. to Table 2.) were prepared by heating to 1300°C in a reducing atmosphere. The translucencies of the specimens of the thickness of 0.2mm were measured by a spectrophotometer. The translucency of the specimen increased with the talc content. The amounts of heterogeneous glass phases and of quartz particles in the porcelain bodies decreased as the talc content increased. The amount of mullite was largest in the specimen B and then decreased as the talc content increased. Small amount of pseudohexagonal prism crystals was observed in the specimen C. The amount of the pseudohexagonal prisms increased with the talc content and was about 30% in the specimen E. Refractive indices of the heterogeneous glasses became lower as the talc content increased, but those of homogeneous glasses remained almost constant. The pseudohexagonal prism was indentified as cordierite from its optical constants and X-ray powder pattern.
It was concluded that the increase of the amount of homogeneous glass phases and the decrease of the amount of heterogeneous glass phases were the main factors of the increase of translucency of porcelain bodies with the addition of talc.