Void-free epoxy castings for cryogenic insulators and seals
The design of the Westinghouse Magnet for the Oak Ridge National Laboratory's Large Coil Program (LCP) incorporates a main lead bushing which transmits heat-leak loads by conduction to the supercritical helium stream. The bushing, which consists of epoxy resin cast about a copper conductor, must be electrically insulated, vacuum tight and be capable of withstanding the stresses encountered in cryognic service. The seal design of the bushing is especially important; leakage from either the helium system or the external environment into the vacuum will cause the magnet to quench. Additionally, the epoxy-resin casting must resist mechanical loads caused by the weight of leads attached to the bushing and thermal stresses transmitted to the epoxy via the conductor. The epoxy resin is cast about the conductor in such a way as to provide the required vacuum tight seal. The technique by which this is accomplished is reviewed. Equally important is the elimination of voids in the epoxy which will act as stress-concentrating discontinuities during cooling to or warming from 4K. The types of voids that could be expected and their causes are described. The paper reviews techniques employed to eliminate voids within the cast-resin portion of the bushing.
- Research Organization:
- Westinghouse Research and Development Center, Pittsburgh, PA (USA). Insulation Dept.
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5731933
- Report Number(s):
- CONF-830841-10; ON: DE83017273
- Resource Relation:
- Conference: Cryogenic engineering conference and international cryogenic materials conference, Colorado Springs, CO, USA, 15 Aug 1983; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRICAL INSULATORS
SUPERCONDUCTING MAGNETS
CASTINGS
CRYOGENICS
EPOXIDES
SEALS
STRESSES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SUPERCONDUCTING DEVICES
700202* - Fusion Power Plant Technology- Magnet Coils & Fields
420201 - Engineering- Cryogenic Equipment & Devices