Heating element made of PTC ceramic material

Details Heating element made of PTC ceramic material Heating element made of PTC ceramic material

1978-03-02

1981-01-13

Albritton, C. L.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219374, 219505, 252 623BT, 252520, 338 22SD, 338 23, F24H 304, H05B 314, H01C 702, C04B 3546

Patent

active

042451469

ABSTRACT:
Disclosed herein is a heating element for an air heater and the like comprising a ceramic material in the form of a honeycomb as well as the process for producing the ceramic material. The heating element is characterized by its relatively high amount of heat generation capability compared to a conventional heating element of the same size. Preferable ceramic materials for the heating element have a temperature coefficient of electrical resistance of from 5 to 20%/.degree.C., and consist essentially of from 38.7 to 47.3 molar % of BaO, from 2.5 to 11 molar % of PbO, from 49.8 to 50% of TiO.sub.2, from 0.05 to 0.3 molar % of a semiconductor forming element and from 0.002 to 0.015 part by weight of Mn.

REFERENCES:
patent: 2976505 (1961-03-01), Ichikawa
patent: 3927300 (1975-12-01), Wada et al.
patent: 3975307 (1976-08-01), Matsuo et al.
patent: 4032752 (1977-06-01), Ohmura et al.
NGK Technical Report, "Honeycomb Structure BaTiO.sub.3 Ceramics for Heater Applications", Published by NGK Insulators, Ltd., Nagoya, Japan, 7 pages total, Mar. 1974.

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