| 摘要 |
The apparatus comprises an insulated storage tank adapted to hold a liquified cryogenic fluid and vapor emanating from the liquified cryogenic fluid, an insulated working chamber adapted to hold an object to be treated, and a vacuum pump for evacuating the interior of the working chamber. The storage tank is in fluid communication with the working chamber, either directly, or through a vapor reservoir adapted to hold the vapor emanating from the cryogenic fluid. The method comprises introducing the vapor and/or liquid cryogen into the working chamber either in discrete or continuous amounts. The working chamber can be evacuated to a specific negative pressure either prior to introducing the vapor and/or liquid cryogen or simultaneously as the cryogens are introduced. The apparatus also provides the capability of heating materials from cryogenic levels to room-or-higher-temperature levels in a choice of ambient gases.
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