Strengthened composite glass article and method of production

Details Strengthened composite glass article and method of production Strengthened composite glass article and method of production

1975-08-21

1976-06-08

Douglas, Winston A.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

106 52, 428428, B32B 1706, B32B 1712, C03C 304

Patent

active

039625150

ABSTRACT:
A composite glass article is disclosed that is composed of a TiO.sub.2 --Al.sub.2 O.sub.3 --SiO.sub.2 glass core portion encompassed within a compressively stressed, vitreous silica-type glass exterior portion. The composite is strengthened by heat treatment within the ranges of 600.degree.C. to 900.degree.C. to effect a non-reversible contraction of the core glass at temperatures below the lowest glass strain point.

REFERENCES:
patent: 2313296 (1943-03-01), Lamesch
patent: 2326059 (1943-08-01), Nordberg
patent: 3227032 (1966-01-01), Upton
patent: 3484258 (1969-12-01), Redwine et al.
patent: 3597305 (1971-08-01), Giffen
patent: 3644607 (1972-02-01), Roques et al.
patent: 3778335 (1973-12-01), Boyd
patent: R27560 (1973-01-01), Achener

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