Heat exchange – Structural installation – Heating and cooling
Patent
1989-10-05
1992-08-04
Davis, Jr., Albert W.
Heat exchange
Structural installation
Heating and cooling
165 61, 165 70, 1566164, 15661641, 422248, 373113, 373158, C30B 2906, C30B 3500, B22D 2704, F28D 1502
Patent
active
051350475
ABSTRACT:
The manufacturing of high temperature superconducting crystals and high quality crystals in general requires a furnace design with very precise process control to minimize the crystal defects. A furnace design of this type can be realized by growing crystals in the cavity of the evaporator section of a specially designed heat pipe, since the temperature of the working fluid in the heat pipe, and thus in the cavity and crystal, can be maintained very accurately by the control of the evaporating pressure of the heat pipe's working fluid. The crystals are grown from the melt from the bottom of a cooled and rotating crucible which is placed into the heat pipe evaporator cavity. The growth of high temperature superconducting crystals requires high furnace temperatures and an oxygen atmosphere. The high temperature furnace condition is achieved with sodium and potasium heat pipes. A double wall construction between the heat pipe and crystal growing region allows for the maintenance of a vacuum condition between these regions to prevent convective motions and potential safety problems associated with furnace malfunction. The heat pipe condenser and radiation heat sink zone of the evaporator cavity are cooled with fluids circulating through the cooling jackets of the furnace. When the furnace is equipped with a heat pipe working fluid pressure sensor, evaporator cavity and crucible base temperature sensors, and heater and cooling fluid controllers, the temperature control of the crystal growing environment can be maintained within +-0.1.degree. C., for furnace operating temperatures up to 1000.degree. C.
REFERENCES:
patent: 2903495 (1959-09-01), Dickson et al.
patent: 3770047 (1973-11-01), Kirkpatrick et al.
patent: 3857990 (1974-12-01), Steininger et al.
patent: 4312700 (1982-01-01), Helmreich et al.
patent: 4980133 (1990-12-01), Koch
Davis Jr. Albert W.
Dobran Flavio
LandOfFree
Furnace for high quality and superconducting bulk crystal growth does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Furnace for high quality and superconducting bulk crystal growth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Furnace for high quality and superconducting bulk crystal growth will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-772653