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US 4,528,121 AGranted
Electroconductive ceramics
AssigneeHitachi, Ltd.
InventorsYasuo Matsushita, Kousuke Nakamura, Tetuo Kosugi
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AssigneeHitachi, Ltd.
InventorsYasuo Matsushita, Kousuke Nakamura, Tetuo Kosugi
Estimating the term…
Electroconductive ceramic materials with high density, high mechanical strength, high endurance to repeated current supply and excellent thermal shock resistance can be obtained by mixing 5 to 70 parts by weight of Al.sub.2 O.sub.3 or alumina ceramic materials containing 95% by weight or more of Al.sub.2 O.sub.3 and 30 to 95 parts by weight of at least one electroconductive material selected from of ZrB.sub.2, ZrC, ZrN, ZrSi.sub.2, TaB.sub.2, TaC, TaN, TaSi.sub.2, TiB.sub.2, TiC, TiN, Mo.sub.2 B.sub.5 and MoSi.sub.2 adding a molding binder, molding the mixture and sintering the molded mixture. The electroconductive ceramic is usable for heaters, glow plug heaters, electrical gas ignitors, kerosine gasifying burners, and electrodes or conductors for water processing or dialysis.
An electroconductive sintered ceramic which comprises 5 to 70 parts by weight of (a) alumina or an aluminous ceramic containing at least 95% by weight of Al.sub.2 O.sub.3, and 30 to 95 parts by weight of (b) an inorganic compound which exhibits a positive resistance-temperature coefficient and which is selected from the group consisting of ZrB.sub.2, ZrC, ZrN, ZrSi.sub.2, TaB, TaC, TaN, TaSi.sub.2, TiB.sub.2, TiC, TiN, Mo.sub.2 B.sub.5 and MoSi.sub.2.
Dependencies are inferred from the claim text.