Method of manufacturing a low emissivity liquid nitrogen dewar

Details Method of manufacturing a low emissivity liquid nitrogen dewar Method of manufacturing a low emissivity liquid nitrogen dewar

1989-06-21

1991-11-12

Gorski, Joseph M.

Metal working

Method of mechanical manufacture

Assembling or joining

220422, 29458, 156665, B21D 3900

Patent

active

050636510

ABSTRACT:
A liquid nitrogen Dewar includes a spun can for the liquid nitrogen, which spun can is surrounded by an exterior shell. Between the exterior shell and the can is an evacuated space containing a second shell that functions as a radiation shield. The can and both shells are formed of an aluminum alloy having a very high percentage of aluminum. The exterior can surface, interior surface of the exterior shell, and both surfaces of the second shell have clean, non-pitted, smooth, matted, smut free and etched appearances free from discoloration and stains so that these surfaces have low radiation emissivity properties and there is a minimum amount of radiant energy transmitted from the exterior shell to the can and reduced heating of the liquid nitrogen in the can. Each of the surfaces is initially polished, either mechanically, electrochemically or chemically, and then chemically treated with an etchant of nitric acid and hydrofluoric acid for a sufficient duration to achieve the desired appearance.

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patent: 3191795 (1965-06-01), Molnar
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