Method of making a thermistor

Details Method of making a thermistor Method of making a thermistor

1989-06-19

1991-02-19

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Electrical device making

29411, 29412, 295276, 29611, 338 22R, H01C 1728

Patent

active

049931423

ABSTRACT:
A method of making a thermistor comprising the steps of making a layer of thermistor ceramic material comprised substantially of Mn.sub.2 O.sub.3, NiO, Co.sub.3 O.sub.4, Al.sub.2 O.sub.3, CuO, or Fe.sub.2 O.sub.3, having upper and lower surfaces. A first dielectric material comprised of low K Al.sub.2 O.sub.3 or the like is placed on the upper and lower surfaces of the layer, and then is cut into a plurality of elongated strips. The layer is created by blading a slurrey of the ceramic material to create a plurality of uncured sheets; placing the sheets in superimposed position, and then making the monolithic layers from the sheets by applying heat and pressure thereto, and then firing the monolithic layer with heat of increased magnitude. The strips are encapsulated in an envelope of the dielectric material, and terminal connections comprised of silver, Ni, Sn and Pb are imposed thereon. A thermistor chip or strip comprising an elongated ceramic thermistor body with an outside surface and opposite ends. A dielectric envelope encapsulates the outer surface of the body for the ends, and conductive terminal caps are formed on the end of the body. The thermistor is comprised of the materials outlined in the method of making the same.

REFERENCES:
patent: 4434416 (1984-02-01), Schonberger
patent: 4480376 (1984-11-01), Hakanson
patent: 4531110 (1985-07-01), Johnson, Jr. et al.
patent: 4766409 (1988-08-01), Mandai
patent: 4786888 (1988-11-01), Yoneda et al.

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