C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
38/19, 148/3.4
C30B 35/00 (2006.01) C30B 11/00 (2006.01) F27B 5/14 (2006.01) F27B 17/00 (2006.01) F27D 9/00 (2006.01) F27D 19/00 (2006.01) F28D 15/06 (2006.01)
Patent
CA 1236294
12 Title of the Invention: TEMPERATURE GRADIENT FURNACE FOR MATERIALS PROCESSING Inventors: Robert Haslett and William Harwell ABSTRACT OF THE DISCLOSURE A cylindrically hollow segmented thermal gradient furnace enclosing metal or semiconductor material wherein each segment includes a heater for raising the temperature of the metal. The material is encircled by a heat pipe which is coupled to a heat exchanger for rapidly cooling a corresponding segment of the material after the heater has performed a thermal soak of the material. A reservoir is filled with inert gas which is selectively expanded to block cooling at the heat exchanger when the heater is turned on and compressed to allow cooling at the exchanger when the heater is turned off so that a sharp thermal gradient may be established along the length of the material.
497813
Harwell William
Haslett Robert
Grumman Aerospace Corporation
Kirby Eades Gale Baker
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