Heat exchange – Heating and cooling – Heating and cooling of the same material
Patent
1984-01-17
1985-10-01
Davis, Jr., Albert W.
Heat exchange
Heating and cooling
Heating and cooling of the same material
165 61, 165 30, 219390, 219395, 219396, 432 18, F27D 1102
Patent
active
045440255
ABSTRACT:
A high gradient directional solidification furnace is disclosed which includes eight thermal zones throughout the length of the furnace. In the hot end of the furnace, furnace elements (25, 26, and 40) provide desired temperatures. These elements include Nichrome wire (28) received in a grooved tube (30) which is encapsulated by an outer alumina core (32). A booster heater (40) is provided in the hot end of the furnace which includes toroidal tungsten/rhenium wire (42) which has a capacity to put heat quickly into the furnace. An adiabatic zone is provided by insulation barrier (62) to separate the hot end of the furnace from a cold end. The cold end of the furnace is defined by heating elements (80 and 90). A heat transfer plate (70) provides a means by which heat may be extracted from the furnace and conducted away through liquid cooled jackets (72). By varying the input of heat via the booster heater (40) and output of heat via the heat transfer plate (70), a desired thermal gradient profile (120) may be provided.
REFERENCES:
patent: 3644097 (1972-02-01), Knudsen
patent: 3693953 (1972-09-01), Michel
patent: 3732063 (1973-05-01), Corsaro et al.
patent: 3770047 (1973-11-01), Kirkpatrick et al.
patent: 4310300 (1982-01-01), Mackenzie
patent: 4317290 (1983-03-01), Voswinckel
Aldrich Billy R.
Whitt William D.
Beumer Joseph H.
Davis Jr. Albert W.
Manning John R.
The United States of America as represented by the Administrator
Wofford, Jr. Leon D.
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