POSITIVE TEMPERATURE COEFFICIENT CHARACTERISTIC THERMISTOR

摘要

PURPOSE: To facilitate the control of positive temperature coefficient(PTC) characteristics furthermore enhancing the thermal resistance by a method wherein electric insulating particles comprising ion crystals and conductive particles previously mixed with one another are compression-molded. ;CONSTITUTION: Sodium chloride as electric insulating particles put in a resin- made vessel is crushed up using a ball mill and then sieved out to produce specific sodium chloride particles 2. Besides, as for conductive particles, carbon particles 3 are prepared. Next, the sodium chloride particles 2 are wet-mixed with the carbon particles 3 and then a catalyst is removed to produce the mixed powder. The mixed powder filled up in a molding mold is compression-molded to produce a molded product 1. At this time, the conductive particles 3 for controlling the temperature characteristics are blended at higher ratio than conventional one. Besides, the thermal resistance of the electric insulating particles comprising ion crystals is higher than that of conventional organic high molecules. Through these procedures, the control of PTC characteristics can be facilitated furthermore enabling the thermal resistance to be enhanced.;COPYRIGHT: (C)1994,JPO&Japio