Patent ID: 6060412
Filing Date: 2000-05-09
Classification: C03B,C03C

Abstract:
A method of manufacturing a crystallized glass article, comprising the steps of preparing a preform of a crystallizable glass having a composition consisting essentially of, by weight, 55-72% SiO.sub.2, 16-30% Al.sub.2 O.sub.3, 1.5-3% Li.sub.2 O, 1-10% K.sub.2 O, 1-5% TiO.sub.2, 0-4% ZrO.sub.2, 2-9% TiO.sub.2 +ZrO.sub.2, 0-10% ZnO, 0-2.5% MgO, 0-4% CaO, 0-6% BaO, 0-7% B.sub.2 O.sub.3, 0-4% Na.sub.2 O, and 0-8% P.sub.2 O.sub.5, which has a property of being transformed into a crystallized glass which contains precipitated crystals with a maximum grain size not greater than 5 .mu.m and a glass phase at a ratio of 10 to 85 vol %, and which has a softening point lower than a melting point of a predominant precipitated crystal, then crystallizing and performing draw forming by heating it to a temperature higher than the softening point.