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Electrical Resistance Composition

IP.com Disclosure Number: IPCOM000095880D
Original Publication Date: 1964-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Merrin, S: AUTHOR

Abstract

Film resistors are made by applying to and then firing on a ceramic substrate a thin layer of a paste. The latter is a mixture of nonconductive material and a conductive metal dispersed in a vitreous matrix. During operation, the resistances of such devices tend to change in value. The resistance composition described below is subject to very little change in resistance during operation. This stable quality is imparted by the particular glass employed in that composition.

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Electrical Resistance Composition

Film resistors are made by applying to and then firing on a ceramic substrate a thin layer of a paste. The latter is a mixture of nonconductive material and a conductive metal dispersed in a vitreous matrix. During operation, the resistances of such devices tend to change in value. The resistance composition described below is subject to very little change in resistance during operation. This stable quality is imparted by the particular glass employed in that composition.

The composition comprises, by weight, 80% of solids and 20% of a liquid vehicle composed of a resinous binder, a volatilizable solvent and a surface active agent. The solids include, by weight, 20.05% silver, 19. 95% palladium oxide and 60% of a special glass, to which silicon dioxide is added in the ratio of
0. 8 gram of silicon dioxide to 25 grams of the three solids just mentioned.

The glass consists essentially of in mol percent 20-55 of lead oxide, 0-15 of aluminum trioxide, 0-25 of boron trioxide and 40-70 of silicon dioxide together with, if desired, 0. 6-0. 9 mol percent of one of the oxides of titanium dioxide, zirconium dioxide, niobium pentoxide and tantalum pentoxide.

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