Abstract: A PTC heating element with a honeycomb ceramic body comprising a barium titanate and semiconductor element, which provides the ceramic body with a positive temperature coefficient of resistance over the Curie point. An electrode is deposited on each end of the honeycomb body. The electrodes according to the present invention have a non-ohmic property, while the conventional electrodes have been ohmic. A high rush current and migration are advantageously decreased by the non-ohmic electrodes.

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.