Transparent and nonexpansive glass-ceramic

Details Transparent and nonexpansive glass-ceramic Transparent and nonexpansive glass-ceramic

1990-04-23

1991-05-21

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 4, 501 68, 501 69, 501 72, C03C 1012

Patent

active

050175190

ABSTRACT:
A transparent and colorless glass-ceramic containing crystals of .beta.-quartz and .beta.-eucryptite is obtained by heat-treating a glass essentially composed of 63-69 wt % of SiO.sub.2, 18-22 wt % of Al.sub.2 O.sub.3, 3-5 wt % of Li.sub.2 O, 1-3 wt % of MgO, 4-6 wt % of ZrO.sub.2, 0-2 wt % of ZnO, 0-2 wt % of P.sub.2 O.sub.5, 0-2 wt % of Na.sub.2 O, 0-2 wt % of BaO and 0.3-1 wt % of As.sub.2 O.sub.3, with proviso that the proportion of ZrO.sub.2 to SiO.sub.2 is not lower than a specified level and that the molar ratio of Al.sub.2 O.sub.3 to the total of Li.sub.2 O, MgO and ZnO is within a specified range. The thermal expansion coefficient of this glass-ceramic is very close to zero over the range from room temperature to about 300.degree. C.

REFERENCES:
patent: 3157522 (1964-11-01), Stookey
patent: 3241985 (1966-03-01), Kuwayama
patent: 3252811 (1966-05-01), Beall
patent: 3380818 (1968-04-01), Smith
patent: 4018612 (1977-04-01), Chyung
patent: 4507392 (1985-03-01), Rittler

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