Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-04-04
1992-10-27
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148626, 148633, 266251, 266254, 55 27, 55 68, 55 75, C21D 600, C21D 900
Patent
active
051586258
ABSTRACT:
Process for heat treating articles by hardening them in a recirculating gas medium which is in contact with the treated articles, the hardening gas being cooled by means of a heat exchanger, of the type in which helium is used as hardening gas, and is stored under holding pressure in a buffer container, wherein at the end of a hardening operation, a helium load is extracted from the treatment enclosure, in final phase by means of pump until a primary vacuum is obtained, the extracted helium is brought to purifying pressure by means of a compressor associated to a mechanical filter, and the helium under purifying pressure is sent to a purifier in which impurities are removed, after which it is transferred, if desired, after recompression in the buffer container.
REFERENCES:
patent: 2450081 (1948-09-01), Burkhardt
patent: 3713271 (1973-01-01), Franz et al.
patent: 4675030 (1987-06-01), Garnecki et al.
patent: 4867808 (1989-09-01), Heilmann et al.
Duchateau Eric
Lhote Benoit
Queille Philippe
Zumbrunn Jean-Pierre
Dean R.
Ip Sikyin
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
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