PTC thermistor composition and method of making the same

Details PTC thermistor composition and method of making the same PTC thermistor composition and method of making the same

1974-10-09

1976-08-17

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252518, 252521, 106 7331, 106 7332, H01B 108

Patent

active

039753077

ABSTRACT:
A PTC thermistor composition comprising BaTiO.sub.3, TiO.sub.2, one oxide selected from the group consisting of Nb.sub.2 O.sub.5 and Y.sub.2 O.sub.3, Al.sub.2 O.sub.3, SiO.sub.2, Li.sub.2 CO.sub.3, MnO.sub.2 and one oxide selected from the group consisting of Sb.sub.2 O.sub.3 and Bi.sub.2 O.sub.3, and process for the production thereof are provided. Said process is characterized by the addition of TiO.sub.2 and Nb.sub.2 O.sub.5 to BaTiO.sub.3 before calcination and the addition of Al.sub.2 O.sub.3, SiO.sub.2, Li.sub.2 CO.sub.3, MnO.sub.2 and Sb.sub.2 O.sub.3 after the calcination. This PTC thermistor composition has a high breakdown voltage, a large electric current at the initial moment of a voltage application which current decreases rapidly with continuing voltage application, low specific resistivity and, good stability of resistivity.

REFERENCES:
patent: 3373120 (1968-03-01), Tsuneharu Nitta et al.
patent: 3586642 (1971-06-01), Matsuo et al.
patent: 3674713 (1972-07-01), Yperman et al.

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