Glass ceramic seals to inconel

Patent · 07 November 1983

OSTI ID:864778

McCollister, Howard L ^[1]; Reed, Scott T ^[1]

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1. Albuquerque, NM

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.

• Research Organization: AT & T CORP
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4414282
• Application Number: 06/369,965
• OSTI ID: 864778
• Country of Publication: United States
• Language: English

Related Subjects

/428/65/501/
1-5
1-8
2-8
5-7
65-80
8-16
ceramic
ceramic composition
ceramic seal
ceramic seals
coefficient
composition
composition comprising
comprising
containing
cooling
creating
cristobalite
crystallization
crystallize
dissolve
expansion
expansion coefficient
following
glass
glass ceramic
glass composition
growth
heating
holding
inconel
lithium
maintaining
metasilicate
nucleii
period
period sufficient
prepared
processing
processing step
processing steps
producing
products
products containing
recrystallize
seals
sio
specific
steps
subjecting
sufficient
temperature
temperature sufficient
therein
thermal
thermal expansion
thermally
thermally treating
time
time period
treating
weight