Thermally crystallizable glasses and glass-ceramics made therefr

Details Thermally crystallizable glasses and glass-ceramics made therefr Thermally crystallizable glasses and glass-ceramics made therefr

1977-04-15

1978-07-11

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 52, C03C 322, C03C 304

Patent

active

041000013

ABSTRACT:
Thermally crystallizable glass and glass-ceramic compositions, having a narrow critical range of compositions coming within the SiO.sub.2 -Al.sub.2 O.sub.3 -Li.sub.2 O system, consist essentially of SiO.sub.2, Al.sub.2 O.sub.3, Li.sub.2 O, TiO.sub.2 and ZrO.sub.2, contain 18.2-20.3 parts Al.sub.2 O.sub.3 per 100 parts by weight of SiO.sub.2 +Al.sub.2 O.sub.3 +Li.sub.2 O, have Li.sub.2 O to Al.sub.2 O.sub.3 molar ratio of 0.55 to 0.63, and contain 2.8-5 weight percent TiO.sub.2 +ZrO.sub.2. Glass-ceramics of superior static fatigue resistance can be made from such glasses.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3157522 (1964-11-01), Stookey
patent: 3625718 (1971-12-01), Petticrew
patent: 3779856 (1973-12-01), Pirooz
patent: 3970463 (1976-07-01), Planchock et al.
patent: 4009042 (1977-02-01), Rittler
patent: 4011091 (1977-03-01), McCollister
patent: 4033775 (1977-07-01), Grossman

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