Variably translucent glass-ceramic article and method for making

Details Variably translucent glass-ceramic article and method for making Variably translucent glass-ceramic article and method for making

1991-10-09

1992-12-22

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 7, 501 9, 501 72, 65 33, C03C 1014, C03C 1012, C03C 3085, C03C 3078

Patent

active

051734532

ABSTRACT:
This invention is directed toward of a glass-ceramic article consisting essentially, expressed in terms of weight percent on the oxide basis, of about 64-70% SiO.sub.2, 18-22% Al.sub.2 O.sub.3, 3.3-4% Li.sub.2 O, 2-5% ZnO, 0-2% MgO, 1.5-3.5% ZrO.sub.2, 0.5-2.5% TiO.sub.2, 3.5-4.5% ZrO.sub.2 +TiO.sub.2, 0.5-1.5% As.sub.2 O.sub.5 and 0-0.5% SnO.sub.2. The glass-ceramic article disclosed herein, is comprised of adjacent areas which exhibit visible transmissions ranging from transparent-to-opaque. The transparent areas are clear, transparent and essentially colorless and contain stuffed .beta.-quartz as essentially the sole crystal phase. On the other hand, the translucent-to-opaque areas contain .beta.-spodumene as the predominant crystal phase with a minor amounts of gahnite crystals resulting from the thermal transformation of said stuffed .beta.-quartz. This gahnite phase is present in an amount sufficient to compensate for the transformation of said stuffed .beta.-quartz to .beta.-spodumene, resulting in a dimensional change, expressed in terms of density change, of essentially zero.

REFERENCES:
patent: 3812689 (1974-05-01), Reade
patent: 4018612 (1977-04-01), Chuyng
patent: 4084974 (1978-04-01), Beall et al.
patent: 4461839 (1984-07-01), Rittler
patent: 4835121 (1989-05-01), Shibuya et al.
patent: 5010041 (1991-04-01), Koyama et al.
patent: 5064461 (1991-11-01), Morena et al.
patent: 5070045 (1991-12-01), Comte et al.

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