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Apparatus and method for the deep cryogenic treatment of materials
Apparatus and method for the deep cryogenic treatment of materials
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机译：用于材料的深低温处理的设备和方法
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摘要
Apparatus and method 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. An insulated box-like treatment chamber (10) is disclosed which includes a perforated platform (32) extending parallel to and spaced above the bottom of the chamber (20). Parts and items to be treated are supported on the platform (32) and cryogenic liquid is introduced into the chamber below the platform (32) in accordance with a time-temperature program which reduces the temperature of the parts and items in stages to -195 DEG C (-320 DEG 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 -195 DEG C (-320 DEG 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.
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