Heat treatment apparatus

Details Heat treatment apparatus Heat treatment apparatus

1987-08-21

1988-09-13

Yuen, Henry C.

Heating

Work chamber having heating means

Having means by which work is progressed or moved mechanically

432205, 432209, 432199, 432202, F27B 900, F27B 504

Patent

active

047706309

ABSTRACT:
A heat treatment apparatus which comprises a treatment chamber formed with heat insulating walls, a graphite heater installed in the treatment chamber, a gas supply port supplying non-oxidizing gas to the chamber and an exhaust port for carrying gas out of the chamber. At least a part of the inner side of the heat insulating walls is made of graphite group material of bulk density of not less than 0.3 g/cm.sup.3. The ratio of the outer surface area of the graphite heater (Ah) to the surface area of the chamber-facing side of the heat insulating walls (Ai), Ah/Ai is within the range of 0.1-0.4, and the relationship between the surface area of the graphite group material (Ar) and (Ah) is Ar>Ah. By this structure, the temperature of the heater to be set for heat treatment of workpieces can be decreased, and the life spans of the heater and the heat insulating walls can be increased.

REFERENCES:
patent: 3565410 (1968-09-01), Scherff
patent: 3850574 (1974-11-01), Namba
patent: 4326694 (1982-04-01), Bergman
patent: 4354827 (1982-10-01), Kissel
patent: 4512737 (1985-04-01), Pierce

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