Patent ID: 6124223
Filing Date: 2000-09-26
Classification: C03C,C04B,G11B

Abstract:
A glass-ceramic article exhibiting a crystal phase assemblage which is comprised of fine-grained, microstructures of .beta.-quartz and at least one phase selected from enstatite and spinel, the article having a composition which consists essentially of, in weight percent on the oxide basis, 40-65% SiO.sub.2, 10-40% Al.sub.2 O.sub.3, 5-25% MgO, 0.5-4% Li.sub.2 O, 5-15% TiO.sub.2, and up to 5% ZrO.sub.2, such that the sum (TiO.sub.2 +ZrO.sub.2) is at least 9%.