Differential densification strengthening of glass-ceramics

Details Differential densification strengthening of glass-ceramics Differential densification strengthening of glass-ceramics

1973-11-07

1976-01-06

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428212, 428428, 156 84, 156 85, 65 33, 6 5, B32B 702, B32B 1706, C03B 3200

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active

039314383

ABSTRACT:
A strengthened glass-ceramic laminated article having a compressively-stressed surface layer substantially enveloping a tensilely-stressed core portion, produced by choosing the core and surface layer compositions such that the core undergoes a net positive differential densification with respect to the surface layer as the result of phase transformations occurring in the laminated article during crystallization in situ. Such an article offers significant advantages over glass and glass-ceramic articles strengthened by prior art methods, including improved mechanical stability, thermal shock resistance, and, most importantly, excellent high temperature strength retention.

REFERENCES:
patent: 1960121 (1934-05-01), Moulton
patent: 2157100 (1939-05-01), Roland
patent: 3253975 (1966-05-01), Olcott et al.
patent: 3573020 (1971-03-01), Karstetter
patent: 3582385 (1971-06-01), Duke et al.
patent: 3637453 (1972-01-01), Simmons
patent: 3673049 (1972-06-01), Giffin et al.
patent: 3756798 (1973-09-01), Ernsberger
patent: 3764444 (1973-10-01), Simmons
patent: 3779856 (1973-12-01), Pirooz

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