| 摘要 |
A composite PTC material made of cristobalite as a matrix and a conductive filler, having a room temperature resistivity of 10<-1> OMEGA cm or less. The conductive filler is at least one substance selected from the group consisting of single metals, metal silicides, metal carbides and metal borides; has a room temperature resistivity of 10<-3> OMEGA cm or less when per se made into a sintered material; has particle diameters of 2-50 mu m; and is contained in a proportion of 20-35% by volume of the composite PTC material. The composite PTC material has a relative density of 90% or more after firing. |
