Method for cooling a vacuum furnace

Details Method for cooling a vacuum furnace Method for cooling a vacuum furnace

1986-08-21

1988-07-12

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148128, C21D 174

Patent

active

047567732

ABSTRACT:
A vacuum furnace is cooled in a two-step process. In the first step, a noble gas is injected into the furnace to break the vacuum, and to provide initial cooling. In the second step, a non-noble, but relatively inert, gas is injected into the furnace to complete the cooling. The flow of the noble gas is cut off when the temperature in the furnace falls below the point at which the contents of the furnace will no longer react with the second gas. The invention also discloses apparatus for cooling the furnace. Temperature controllers monitor the temperature, and rate of temperature change, in the furnace, and direct controlled amounts of noble or non-noble gas into the furnace. At no time is a liquefied gas allowed to enter the furnace. The process allows the furnace to be cooled rapidly but safely, minimizing the danger of thermal shock to the internal furnace components.

REFERENCES:
patent: 3819428 (1974-06-01), Moore
patent: 3853637 (1974-12-01), Gray et al.
patent: 4634103 (1987-01-01), Schchmetz

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