Glass sealant containing lead borate glass and fillers of mullit

Details Glass sealant containing lead borate glass and fillers of mullit Glass sealant containing lead borate glass and fillers of mullit

1990-10-22

1992-09-08

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 17, 501 32, C03C 824, C03C 814

Patent

active

051458039

ABSTRACT:
A glass sealant comprises a mixture of about 70-90% of a solder glass powder of a low-melting lead-borate glass with a transformation temperature of 330.degree. C. or lower, 1-20% by weight of cordierite powder, and 1-25% by weight of mullite powder, with the combined content of cordierite and mullite powder being from about 10-30%. The lead-borate glass comprises from about 82-88% by weight of PbO, 12-17% by weight of B.sub.2 O.sub.3, 0-1% by weight of SiO.sub.2, and 0-1% by weight of Al.sub.2 O.sub.3. Both the cordierite and mullite powder are preferably synthetically produced to reduce the .alpha.-radiation. The synthetically produced cordierite powder preferably still contains up to about 9% by weight of a non-crystalline vitreous phase. The grain size of the powders is preferably under 100 microns. This glass sealant has well-balanced properties relative to thermal expansion, melting temperature, dielectric constant, loss angle, mechanical strength, thermal shock resistance, and chemical resistance. It is particularly suitable as ceramic dual-line package solder (CERDIP) for sealing of aluminum oxide housings for integrated circuits.

REFERENCES:
patent: 3954486 (1976-05-01), Francel et al.
patent: 4006028 (1977-02-01), Nofzigor
patent: 4704370 (1987-11-01), Seki et al.
patent: 4774208 (1988-09-01), Yamanaka et al.
patent: 4883777 (1989-11-01), Yananaka
Hawley's "Condensed Chemical Dictionary", 1987, p. 43.

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