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Resistor Compositions with Improved Stability

IP.com Disclosure Number: IPCOM000095343D
Original Publication Date: 1965-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Touw, TR: AUTHOR

Abstract

These resistor compositions provide long-term stable resistivity values and are of the glazed type adapted to be screened on a ceramic substrate. The drift of resistivity values due to a change in the oxygen content of the resistor is reduced. Such is effected by mixing a P-type metal oxide, whose resistivity increases with loss of oxygen, and an N-type metal oxide, whose resistivity decreases with loss of oxygen, so that the two effects counteract each other.

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Resistor Compositions with Improved Stability

These resistor compositions provide long-term stable resistivity values and are of the glazed type adapted to be screened on a ceramic substrate. The drift of resistivity values due to a change in the oxygen content of the resistor is reduced. Such is effected by mixing a P-type metal oxide, whose resistivity increases with loss of oxygen, and an N-type metal oxide, whose resistivity decreases with loss of oxygen, so that the two effects counteract each other.

The resistors are formed on the ceramic substrate by applying a resistor paste to the latter and firing in air at about 75 Degrees C. for about 20 minutes. The paste is formed of an inert liquid vehicle carrying solid constituents. A suitable liquid vehicle is beta terpineol with ethyl cellulose. The solid portion comprises by weight 15g%to 70g%metal oxides, 0% to 35% noble metal, and 30% to 65% glass. The metal oxide portion comprises by weight 65% to 100% palladium oxide (P-type) and 0% to 35% cadmium oxide (N-type) or zinc oxide (N-type).

The preferred compositions contain by weight 75% solids and 25% liquid vehicle. The solid portion consists by weight of 21% metal oxides, 19% silver and 60% glass. The solids are premixed dry and then mixed with the liquid vehicle to form a paste. The liquid vehicle consists of a resinous binder, a volatizable solvent, and a surfactant.

With this preferred composition and the metal oxide portion comprising 65% palladium oxid...