Silicon carbide heater

Details Silicon carbide heater Silicon carbide heater

1976-11-18

1978-03-21

Envall, Jr., R. N.

Electrical resistors

Incased, embedded, or housed

Element in insulation with outer metallic sheath

338333, 219552, H05B 308, H05B 314

Patent

active

040805107

ABSTRACT:
A high temperature electrical resistance heater for use within a high temperature furnace. The heater is composed of an elongated tubular element having first and second tubular sections contiguous with one another, the first section being of a high resistivity silicon carbide and disposable within a furnace chamber, the second section being of a low resistivity silicon carbide and disposable external to the furnace chamber. An elongated rod of silicon carbide of low resistivity is disposed coaxially within the tubular element and in electrical connection with an end of the first tubular section. The coaxial ends of the second tubular section and of the rod include contact areas for electrical connection to an external power source. The high resistivity tubular section provides efficient heating, while the low resistivity tubular section and coaxial rod provide a conductive electrical path to the heating section while minimizing the heating thereof.

REFERENCES:
patent: 2271838 (1942-02-01), Hanawalt et al.
patent: 2551341 (1951-05-01), Scheer et al.
patent: 2768277 (1956-10-01), Buck et al.
patent: 4040795 (1977-08-01), Jung

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