Non-lead sealing glasses

Details Non-lead sealing glasses Non-lead sealing glasses

1992-08-03

1993-09-21

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 45, 501 46, C03C 808

Patent

active

052468909

ABSTRACT:
Lead-free, SnO-ZnO-P.sub.2 O.sub.5 glasses contain 25-50 mole percent P.sub.2 O.sub.5 and SnO and ZnO in amounts such that the mole ratio of SnO:ZnO is in the range of 1:1 to 5:1. Optionally, the glasses may contain up to 20 mole percent of modifying oxides including up to 5 mole percent SiO.sub.2, up to 20 mole percent B.sub.2 O.sub.3 and up to 5 mole percent Al.sub.2 O.sub.3, as well as one or more crystallization promoters selected from 1-5 mole percent zircon and/or zirconia and 1-15 mole percent R.sub.2 O. The glasses are particularly useful as sealing glass frits in sealing material to join component parts in articles such as cathode ray tubes. The sealing glass material may contain mill additions to reduce the effective coefficient of thermal expansion in a seal.

REFERENCES:
patent: 2400147 (1946-05-01), Hooley
patent: 3407091 (1968-10-01), Busdiecker
patent: 4314031 (1982-02-01), Sanford et al.
patent: 4874724 (1989-10-01), Beall et al.
patent: 4940677 (1990-07-01), Beall et al.
patent: 5021366 (1991-06-01), Aitken
patent: 5071795 (1991-12-01), Beall et al.
patent: 5089445 (1992-02-01), Francis
patent: 5089446 (1992-02-01), Cornelius et al.
patent: 5122484 (1992-06-01), Beall et al.

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