Crystallized glass

Details Crystallized glass Crystallized glass

1991-12-18

1993-04-20

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 4, 501 5, 501 10, 501 22, 501 76, C03C 810, C03C 1000

Patent

active

052042901

ABSTRACT:
The invention relates to crystallized glass that can be used with various electronic components such as magnetic heads and the like as bonding or sealing glass. This crystallized glass comprises, in % by weight, at least 11-17% of SiO.sub.2, 7-10% of B.sub.2 O.sub.3, 30-55% of PbO, 1-3% of CdO, 5-10% of A.sub.2 O (A stands for a kind of alkali metal), 7-35% of ZnO and 0-10% of ZrO.sub.2 with the sum of ZnO and ZrO.sub.2 not exceeding 35%, and has the characteristics of 550.degree.-600.degree. C. as the working temperature, (80-100).times.10.sup.-7 /.degree.C. as the thermal expansion coefficient, 550.degree. C. or more as the thermal expansion coefficient, and 550.degree. C. or more as the glass transition point after working.

REFERENCES:
patent: 3947279 (1976-03-01), Hudecek
patent: 4816949 (1989-03-01), Yamada et al.
patent: 4855261 (1989-09-01), Mizuno et al.
patent: 4966926 (1990-10-01), Donohue
patent: 5079193 (1992-01-01), Donohue
patent: 5114885 (1992-05-01), Hormadaly

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