Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1997-02-13
1999-06-08
Speer, Timothy M.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428420, 428432, 428701, 428702, B32B 1706
Patent
active
059103710
ABSTRACT:
A composite glass article having a chemically modified ceramic surface whose coefficient of thermal expansion is lower than that of the glass substrate is produced by exposing the glass article maintained at a temperature above its annealing point (typically 500.degree. C.) and below its softening point (soda-lime about 725.degree. C.; borosilicate about 800.degree. C.) to an atmosphere containing prescribed metalorganic compounds. The chemically modified ceramic surface in maintained in compression and is a ceramic consisting of members from a specific group of oxides dependent upon the type of glass comprising the substrate. The method for forming the glass composite article includes applying the metalorganic mixture while the glass substrate is maintained at a temperature above its annealing point (typically 500.degree. C.) and below its softening point (sodalime about 725.degree. C.; borosilicate about 800.degree. C.) to an atmosphere containing prescribed metalorganic compounds. A chemical reaction occurs producing a chemically modified ceramic coating which is in compression relative to the substrate thus conferring increased strength to the glass article.
Duck Charles P.
Francel Josef
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