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PTC materials composed of particles of conducting graphite and insulating cristobalite-form SiO_2 or AIPO_4 were prepared by the use of silicone rubber as a binder. The PTC effect was observed exactly at the reversible phase transition point with a large thermal expansion of cristobalite (ca. 270'C in SiO_2 and ca. 230'C in AIPO_4) , and was reproducible on repeated runs. The magnitude of the PTC effect was high in composites having a middle composition between insulator and conductor in the percolation curve.
グラファイト/クリストバライト/シリコーンゴム系PTCコンポジットの作製
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