Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1979-11-07
1982-11-16
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
137341, 164437, 164438, 219427, 222590, 222593, 222146HE, B22D 1110, B67D 562, H05B 340
Patent
active
043596258
ABSTRACT:
An immersion nozzle for continuous casting resistant to the corrosive action of the melt and the covering material in a mold is made of a refractory material comprising a mixture of electrically conductive graphite and/or silicon carbide, at least one member selected from the group consisting of alumina, zircon, zirconia, fused silica and a metallic silicon, and a binder. The nozzle is covered with a thermal insulating cover having a thickness of approximately 60 mm and made of fused silica containing fibers. The nozzle is preheated without moving it from its operating position by connecting a pair of electrical terminals to opposite ends thereof and passing electric current through the nozzle between the terminals for a period of time sufficient to raise the temperature of the nozzle sufficiently to prevent cracking, spalling, etc. during casting operation. After the preheating is completed the terminals may be removed from the nozzle. The insulating cover may be retained on the nozzle during tapping or the portion thereof that is immersed in the melt may be cut away.
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patent: 4161647 (1979-07-01), Carbomnel
Murakami Kazumasa
Okada Tamio
Bartis A.
Nippon Crucible Co., Ltd.
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