| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently lower the resistance value of a PTC thermistor in the ordinary time and also to thermally stabilize the same, by a method wherein at least a specific amount of at least one kind of a metal and/alloy having a means grain diameter decreasing the volume thereof by melting down is dispersed in an amorphous body mainly comprising C. SOLUTION: 10-90 wt.% of at least one kind of metal and/or alloy in the means grain diameter of 0.5-500 nm decreasing the volume thereof by melting down is dispersed in an amorphous body mainly comprising C. This amorphous body mainly comprising C is produced by heat-treating a heat resistant polymer in reducing atmosphere. As for the heat resistant polymer, a stiff chain heat resistant polymer such as polyimide, polyoxadiazole, polyparaphenylenevinylene, etc., are preferable. Besides, as for the metal and/or alloy decreasing the volume by melting down, those meeting the operational principles are preferable such as one of the metals out of Bi, Sb, Ga, Ge, Si or one of the alloys out of Bi-Pb- Sn, Bi-Pb-Sn-Sb, etc. |
