POSITIVE-TEMPERATURE-COEFFICIENT EFFECT IN GRAPHITE CRISTOBALITE COMPOSITES

被引：20

作者：

OTA, T ^{[1
]}

YAMAI, I ^{[1
]}

机构：

[1] NAGOYA INST TECHNOL,CERAM RES LAB,TAJIMI 507,JAPAN

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1992年 / 75卷 / 07期

关键词：

POSITIVE TEMPERATURE COEFFICIENT OF RESISTIVITY; CONDUCTORS; CRISTOBALITE; COMPOSITES; GRAPHITE;

D O I：

10.1111/j.1151-2916.1992.tb07196.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

An anomalous positive temperature coefficient (PTC) of resistance was found in a conductor-insulator ceramic composite. The composite material was composed of randomly dispersed conducting graphite and insulating cristobalite-form SiO2 particles. The PTC effect occurred at exactly 230-degrees-C, that is, at a reversible phase inversion point with a large thermal expansion of cristobalite. The magnitude of the PTC anomaly was high in composites located in the middle of the percolation curve, and loaded with large graphite and fine SiO2 particles.

引用

页码：1772 / 1776

页数：5

共 14 条

[1] NEW CLASS OF SWITCHING MATERIALS [J].