Clinochlore를 利用한 Cordrerite 素地의 生成 및 性質에 미치는 Al₂O₃의 影響

Korean clinochlore, kaolin, pyrophillite and a technical grade of alumina have been used to investigate the effects of Al₂O₃ on the formation and properties of cordierite bodies. The body compositions were formulated from the proper proportions of the above raw materials to cover the range of composition from the point corresponding to the stoichiometric formula of cordierite, by the consecutive increasment of 0.2㏖. Al₂O₃, toward the apex of Al₂O₃ on the MgO-Al₂O₃-SiO₂ triaxial diagram. Each of bodies was fired with the elevated temperatures from 1100℃ to 1400℃ by 50℃ interval. Linear shrinkage and water absorption were taken as measures for the firing range of the bodies. The formation of cordierite was estimated from the comparative study of X-ray diffraction and dilatometry of the fired bodies. The formation of a large amount of cordierite was initiated about 1200℃. The content of Al₂O₃ exceeded up to 0.8 ㏖. comparing to the stoichiometric formula of cordierite broadens the firing range of the body.