Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1982-04-19
1983-11-08
Kellogg, Arthur D.
Stock material or miscellaneous articles
Composite
Of quartz or glass
65 33, 65 43, 65 5922, 428450, 501 4, 501 5, B32B 1500
Patent
active
044142820
ABSTRACT:
A glass ceramic composition prepared by subjecting a glass composition comprising, by weight, 65-80% SiO.sub.2, 8-16%, Li.sub.2 O, 2-8% , Al.sub.2 O.sub.3, 1-8% K.sub.2 O, 1-5% P.sub.2 O.sub.5 and 1.5-7% B.sub.2 O.sub.3, to the following processing steps of heating the glass composition to a temperature sufficient to crystallize lithium metasilicate therein, holding the glass composition at a temperature and for a time period sufficient to dissolve the lithium metasilicate therein thereby creating cristobalite nucleii, cooling the glass composition and maintaining the composition at a temperature and for a time period sufficient to recrystallize lithium metasilicate therein, and thermally treating the glass composition at a temperature and for a time period sufficient to cause growth of cristobalite and further crystallization of lithium metasilicate producing a glass ceramic composition having a specific thermal expansion coefficient and products containing said composition.
REFERENCES:
patent: 4042362 (1977-08-01), MacDowell et al.
patent: 4285728 (1981-08-01), Babcock et al.
McCollister Howard L.
Reed Scott T.
Besha Richard G.
Kellogg Arthur D.
McMillan Armand
Sopp Albert
The United States of America as represented by The United States
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