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

1974-09-18

1976-06-08

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252521, 106 46, 106 7331, H01B 108

Patent

active

039621464

ABSTRACT:
A PTC thermistor composition containing barium oxide and titanium oxide as a base material, a semiconducting element to make the base material semiconductive and hafnium dioxide, and if necessary, an additive element. Due to the use of hafnium dioxide, the thermistor composition contributes to a large positive temperature coefficient of resistance. This invention also provides a novel method of making the thermistor composition, in which the addition of hafnium is carried out at the step of milling which comes after the step of calcining. By this method, hafnium can be very effectively used.

REFERENCES:
patent: 3373120 (1968-03-01), Nitta et al.
patent: 3586642 (1971-06-01), Matsuo et al.
patent: 3673119 (1972-06-01), Ueoka et al.
Chemical Abstracts 68, 109126a "Nature of the Formation of Semiconductor Properties in Alloyed Barium Titanate."
Chemical Abstracts 79, 98450a "Barium Titanate Type Thermistors."

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