Refrigeration – Processes – Deodorizing – antisepticizing or providing special atmosphere
Patent
1987-07-27
1988-04-26
Capossela, Ronald C.
Refrigeration
Processes
Deodorizing, antisepticizing or providing special atmosphere
62216, 62223, 62457, F24F 316
Patent
active
047396229
ABSTRACT:
Apparatus and methodology for the ultralow temperature processing of metallic, carbide, ceramic and plastic parts and items to materially increase their wear, abrasion, erosion and corrosion resistivity, stabilize their strength characteristics, improve their machinability and provide stress relief. The cryogenic treatment processing is carried out in an insulated box-like treatment chamber which includes a perforated platform extending parallel to and spaced above the bottom of the chamber. Parts and items to be treated are supported on the platform and cryogenic liquid is introduced to the chamber below the platform in accordance with a time-temperature program which reduces the temperature of the parts and items in stages to -320.degree. F. by initial cooling of the parts and items by evaporating vapors from the cryogenic liquid pool in the space below the platform and thereafter by partial or substantial submersion of the parts and items in the cryogenic liquid. After a soak period at the -320.degree. F. temperature level, the temperature of the parts and items in the treatment chamber is raised to ambient by controlled evaporation of the cryogenic liquid therein. Temperature and liquid level monitoring devices are mounted in the treatment chamber and information derived therefrom is utilized by a process controller to direct the supply of cryogenic liquid to the treatment chamber in accordance with the desired temperature descent and ascent profiles for the weight of the parts within the chamber.
REFERENCES:
patent: 4030314 (1977-06-01), Strehler
patent: 4328676 (1982-05-01), Reed
patent: 4455842 (1984-06-01), Granlund
Capossela Ronald C.
Cryogenics International, Inc.
Junkins Philip D.
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