TiO_2含有MgO-Al_2O_3-SiO_2系ガラスの結晶化に対する核生成のための熱処理の効果

概要

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The effect of heat-treatment for nucleation on the crystallization of MgO-Al_2O_3-SiO_2, glass containing TiO_2, was investigated. The glass having a composition 16.7 ・MgO22.3 Al_2O_3・61SiO_2(wt% ) and containing 10 wt% of TiO_2, as nucleating agent shows phase separation, whereas the glass of a similar basic composition without nucleating agent does not show phase separation. The rate of nucleation of Mg-Al-titanates [x(Mg0.2TiO_2).y(Al_2O_3・TiO_3)] crystals was the largest when heat-treated at 760℃. Spherical particles with a mean diameter of 1O0-150 Å are confirmed to precipitate before the crystallization of main crystals β-quartz and petalite (・AlMgO_2O_3・SiO_2) takes place. The nucleation from the quenched glass takes place even at a temperature (730℃)lower than the glass transition temperature ( Tg= 750℃) . The temperatures at which the precipitation of β-quartz and petalite take place become higher, and the size of Mg-Al-titanate crystal becomes smaller as the number of the small particles formed in the first heat- treatment increases.
社団法人日本セラミックス協会の論文
1988-02-01