Strengthened glass-ceramic article and method

Details Strengthened glass-ceramic article and method Strengthened glass-ceramic article and method

1982-06-14

1983-07-05

Bell, Mark

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 7, 501 61, 501 66, 501 67, C03C 322, C03C 304

Patent

active

043919146

ABSTRACT:
The glass-ceramic disclosed is characterized by a lithium aluminosilicate crystal phase having a very low coefficient of thermal expansion and a residual glassy phase of substantial amount and higher coefficient of expansion, usually a borosilicate or boroaluminosilicate glass. The two phases form a dilatant system wherein the thermal expansion curve changes markedly in character at a transition point in the range of 500.degree.-750.degree. C., the crystal phase dominating below that temperature and the glass phase controlling at higher temperatures.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3148994 (1964-09-01), Voss
patent: 3473937 (1969-10-01), Tashiro et al.
patent: 3498775 (1970-03-01), Simmons
patent: 3524748 (1970-08-01), Beall
patent: 3907577 (1975-09-01), Kiefer et al.
patent: 3931438 (1976-01-01), Beall et al.
patent: 3985533 (1976-10-01), Grossman
patent: 4074992 (1978-02-01), Voss
patent: 4192688 (1980-03-01), Babcock et al.
patent: 4239521 (1980-12-01), Beall

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