石英-長石-カオリン系磁器素地の緻密化と曲げ強度に及ぼす石英の効果

概要

論文の詳細を見る
Effect of quartz on the sintering and bending strength of the porcelain bodies in quartz feldspar kaolin system was investigated by the observation of bulk density, 3 point bending strength test, X ray diffraction and the microstructures using a scanning electron microscope. Quartz and feldspar were jet milled to mean particle sizes of 5 pm and 4.5 pm respectively, before the wet mixing of the raw materials. Porcelain bodies containing 45% feldspar and 55% kaolin showed full densification in long firing range. A mean bending strength of the body increased from 15 kg/mm^2 to 19 kg/mm^2 with the increase of firing temperature from 1150℃ to 1300℃. Quartz particles acted as inclusions before dissolution and restrained the sintering of the body to increase the maturing temperature. These particles hardly reacted on the eutectic melts, formed from decomposed kaolin and feldspar, and showed isolated microstructures. Therefore, the bending strength of the body containing quartz never exceeded 16 kg/mm^2 in this experimental conditions. These results were discussed in a viewpoint of Microstructural developments, utilizing a phase diagram in K_2O Al_2O_3 SiO_2 system.
社団法人日本セラミックス協会の論文
1994-01-01