| 摘要 |
A body of ceramic material of positive temperature coefficient of resistivity is molded so that a plurality of passages extend between opposite ends of the body. In molding the body, lands or abutments of resistor material are formed around the ends of alternate body passages at one end of the body and around the ends of the other passages at the opposite end of the body. A band of masking material is applied to the sides of the body and the body is then immersed in a coating bath for simultaneously coating the inner walls of the body passages, the ends of the body, and the unmasked bands of the body side surface with an electrically conductive ohmic contact material. Preferably, the ohmic contact and masking materials are selected to be impervious to reducing atmospheres and the ends of the body are treated for coating at least the unmasked bands of the body side surfaces with a material characterized by low electrical contact resistance. Thereafter, the outer ends of the abutments are abraded for removing coating materials from the ends of the abutments.
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