CRYSTALLIZABLE GLASS, CRYSTALLIZED GLASS, CRYSTALLIZED GLASS ARTICLE, AND METHOD OF MANUFACTURING THE CRYSTALLIZED GLASS ARTICLE

摘要

A crystallized glass which can be redraw-molded and a process forproducing a crystallized glass article by redraw-molding. In the crystallizedglass, the maximum particle size of the deposited crystals is 5 µm or belowand the glass phase amounts to 10 to 85 % by volume. It has a softening pointlower than the melting point of the main deposited crystals and itscrystallization does not proceed substantially, even when it is heated to atemperature higher than the softening point. A redraw-molded crystallizedglass article may be produced by premolding the above-mentionedcrystallized glass and then orienting it while heating to a temperature higherthan the softening point.