Method of treating materials at low temperatures

Details Method of treating materials at low temperatures Method of treating materials at low temperatures

F - Mech Eng,Light,Heat,Weapons

25

D

F25D 31/00 (2006.01)

Patent

CA 2041341

ABSTRACT OF THE DISCLOSURE Materials such as tool steel, plastics and natural fibres are treated at low temperatures to enhance their performance. An economical process provides for first cooling the material down to about -70°C for a predetermined time followed by an intense cooling step down to about -190°C for a short duration. The materials are allowed to warm up in two stages pausing between stages at about -70°C. The specific time/temperature program utilizes liquid carbon dioxide and liquid nitrogen and may be varied for the materials to be treated.

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