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Change of Electrical Resistance in Electrically Conductive Ceramic Composites under Tension and Compression Load

1995; Ceramic Society of Japan; Volume: 103; Issue: 1198 Linguagem: Inglês

10.2109/jcersj.103.576

1882-1022

Atsumu Ishida, Masaru Miyayama, Akira Kishimoto, Hiroaki Yanagida,

High voltage insulation and dielectric phenomena

Electrical and mechanical properties of ceramic composites were investigated in order to establish a fracture prediction technique. Ceramic composites consist of calcium fluoride as an insulating matrix and silicon carbide as electrically conductive additives. An electrical conduction path was formed by adding more than 4vol% of SiC additives in the composites and the fracture strength increased by the increase of SiC additives. By applying mechanical load, electrical resistance of the composites increased up to fracture under tension while did not change or slightly decreased under compression. The changes in electrical resistance were suggested to occur by the change of connectivity of conduction path in the composites. These results suggest the possibility of predicting fracture in ceramic composites.