Blister-resistant dielectric

Details Blister-resistant dielectric Blister-resistant dielectric

1982-12-01

1984-11-06

McCarthy, Helen M.

Stock material or miscellaneous articles

Composite

Of quartz or glass

29830, 174 685, 252514, 357 71, 357 73, 357 80, 361321, 361411, 428433, 501 17, 501 20, 501153, B32B 1706

Patent

active

044812612

ABSTRACT:
A blister-resistant thick film dielectric is usable with multilayer circuits having one conductor layer comprising gold and another conductor layer comprising silver to prevent blistering and other unwanted phenomena resulting from an adverse electrochemical reaction from occurring between the conductor layers during the firing process. The dielectric is comprised be weight, without vehicle, of about 50% lead-boro-silicate glass, between about 25% to about 40% Al.sub.2 O.sub.3 and between about 10% to 25% an oxide mixture comprised of Co.sub.2 O.sub.3, Cr.sub.2 O.sub.3 Fe.sub.2 O.sub.3, said oxide mixture having been heated to about 1000.degree. C. for about 24 hours. In a preferred embodiment the dielectric is comprised by weight, without vehicle, of about 50% lead-boro-silicate, about 40% Al.sub.2 O.sub.3 and about 10% oxide mixture. The oxide mixture in a preferred embodiment is comprised by weight of about 37.4% Co.sub.2 O.sub.3, about 25.6% Cr.sub.2 O.sub.3 and about 37.0% Fe.sub.2 O.sub.3.

REFERENCES:
patent: 3808042 (1974-04-01), Dietz
patent: 3909277 (1975-09-01), Dube
patent: 4051074 (1977-09-01), Asada
patent: 4235944 (1980-11-01), Felten
patent: 4267074 (1981-05-01), Holmes et al.
patent: 4318830 (1982-03-01), Horowitz

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