High thermal expansion, sealing glass

Details High thermal expansion, sealing glass High thermal expansion, sealing glass

1991-09-23

1993-11-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 22, 501 47, 501 48, C03C 808, C03C 317

Patent

active

052623645

ABSTRACT:
A glass composition for hermetically sealing to high thermal expansion materials such as aluminum alloys, stainless steels, copper, and copper/beryllium alloys, which includes between about 10 and about 25 mole percent Na.sub.2 O, between about 10 and about 25 mole percent K.sub.2 O, between about 5 and about 15 mole percent Al.sub.2 O.sub.3, between about 35 and about 50 mole percent P.sub.2 O.sub.5 and between about 5 and about 15 mole percent of one of PbO, BaO, and mixtures thereof. The composition, which may also include between 0 and about 5 mole percent Fe.sub.2 O.sub.3 and between 0 and about 10 mole percent B.sub.2 O.sub.3, has a thermal expansion coefficient in a range of between about 160 and 210.times.10-7/.degree.C. and a dissolution rate in a range of between about 2.times.10.sup.- 7 and 2.times.10.sup.-9 g/cm.sup.2 -min. This composition is suitable to hermetically seal to metallic electrical components which will be subjected to humid environments over an extended period of time.

REFERENCES:
patent: 3957496 (1976-05-01), Eagan
patent: 4000998 (1977-01-01), Rittler
patent: 4026714 (1977-05-01), Lewis
patent: 4060422 (1977-11-01), Asahara
patent: 4135936 (1979-01-01), Ballard, Jr.
patent: 4202700 (1980-05-01), Wilder, Jr.
patent: 4365021 (1982-12-01), Pirooz
patent: 4438210 (1984-03-01), Rittler
patent: 4455384 (1984-06-01), Day et al.
patent: 4847219 (1989-07-01), Boatner et al.
Doremus, Glass Science, Wiley & Sons (1973) pp. 162-165.
G. Greaves et al., "A Structural Basis For the Corrosion Resistance of Lead-Iron-Phosphate Glasses: An X-Ray Absorption Spectroscopy Study", Philosophical Magazine B, 1988, vol. 58, No. 3, pp. 271-283.

Affiliated with

Also associated with

Rating

High thermal expansion, sealing glass does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High thermal expansion, sealing glass, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High thermal expansion, sealing glass will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-22282