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Glaze Thermistor Fabrication

IP.com Disclosure Number: IPCOM000095185D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Block, ML: AUTHOR [+2]

Abstract

Glaze thermistors are formed on a ceramic dielectric. Such forming is by applying a thermistor paste of solid constituents mixed with an inert liquid vehicle to the dielectric, firing the same at an elevated temperature to form the thermistor element pattern and cooling the element to room temperature. The solids include, by weight, major percentages of semiconductor materials dispersed in a vitreous matrix.

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Glaze Thermistor Fabrication

Glaze thermistors are formed on a ceramic dielectric. Such forming is by applying a thermistor paste of solid constituents mixed with an inert liquid vehicle to the dielectric, firing the same at an elevated temperature to form the thermistor element pattern and cooling the element to room temperature. The solids include, by weight, major percentages of semiconductor materials dispersed in a vitreous matrix.

The paste comprises by weight, 75% of solids and 25% of an inert liquid vehicle composed of a resinous binder, a volatizable solvent and a surfactant. The solids include, by weight, 20% to 40% indium oxide, 20% to 30% palladium oxide and 35% to 60% borosilicate glass.

The paste is applied to the dielectric, fired in air at 875-950 degrees C. and allowed to cool. A thermistor is yielded with a room temperature resistance of 60-800 kilohms per square and a negative temperature coefficient of resistance of more than -1%/ degrees C., over a temperature range of 25-75 degrees C. inclusive.

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