Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1991-02-27
1993-06-01
Picard, Leo P.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174257, 174258, 106 113, 501 21, H05K 100
Patent
active
052162079
ABSTRACT:
A novel ceramic green tape composition useful in the manufacture of silver conductor based, low temperature, co-fired multilayer circuit boards comprises from about 8-35% by weight of a calcium-zinc-aluminum-borosilicate devitrifying glass; from about 10-35% by weight of a low alkali borosilicate glass; from about 10-35% by weight of a lead-zinc-aluminosilicate glass; from about 10-35% by weight of a ceramic filler; up to 0.5% by weight of a coloring agent and from about 20-45% by weight of an organic binder. The co-fired multilayer circuit boards made from these green tape compositions have excellent mechanical and electrical properties and have thermal expansion characteristics matching that of silicon.
The devitrifying glass comprises from about 10-30% by weight of zinc oxide; from about 10-20% by weight of calcium oxide; up to about 15% by weight of boron oxide; from about 15-20% by weight of aluminum oxide and about 25-55% by weight of silicon oxide. The lead-zinc-aluminosilicate vitreous glass comprises from about 30-40% by weight of lead oxide, from about 6-12% by weight of zinc oxide, from about 6-10% by weight of aluminum oxide and from about 40-55% by weight of silicon oxide.
Conductor inks can also be made from the above glasses, and mixtures thereof together with a suitable organic vehicle and a conductive metal such as silver.
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Conlon Edward J.
Prabhu Ashok N.
Thaler Barry J.
Burke William J.
David Sarnoff Research Center Inc.
Korke Trinidad
Picard Leo P.
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