Superconducting magnet coil and curable resin composition used t

Details Superconducting magnet coil and curable resin composition used t Superconducting magnet coil and curable resin composition used t

1993-12-22

1995-01-24

Ryan, Patrick J.

Stock material or miscellaneous articles

Composite

Of metal

4284735, 4284744, 428458, 428930, 505884, 505887, 505813, 505705, 1741251, 335216, B32B 900

Patent

active

053841972

ABSTRACT:
A superconducting magnet coil contains a coil of superconducting wire and a cured product of a curable resin composition with which the coil has been impregnated, the cured product having a thermal shrinkage factor of 1.5-0.3%, preferably 1.0-0.3%, when cooled from the glass transition temperature to 4.2K, a bend-breaking strain of 2.9-3.9%, preferably 3.2-3.9%, at 4.2K and a modulus of 500-1,000 kg/mm.sup.2 at 4.2K, or undergoing a thermal stress of 0-10 kg/mm.sup.2 when cooled from the glass transition temperature to 4.2K and resisting to quench during superconducting operation. It is produced by winding a superconducting wire to form a coil; impregnating the coil with a curable resin composition of low viscosity which contains for example at least one epoxy resin selected from the group consisting of diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F and diglycidyl ether of bisphenol AF, all having a number-average molecular weight of 350-1,000, a flexibilizer and a curing catalyst, to obtain a curable-resin composition-impregnated coil; and heating the curable-resin-composition-impregnated coil to cure the composition.

REFERENCES:
patent: 4595898 (1986-06-01), Shiraki
patent: 5047741 (1991-09-01), Laskaris
patent: 5168259 (1992-12-01), Takemura
patent: 5177056 (1993-01-01), Hilti
Sahu "Chemistry of High T Superconductors II", ACS, 1988, Chapter 1.
Superconductors Materials Problems, Science Apr. 1, 1988, vol. 240, pp. 25-27.
"Superconducting Magnets," Wilson, Clarendon Press, Oxford 1983, pp. 310-330.
Patent Abstracts of Japan, vol. 11, No. 127 (E-501)(2574) Apr. 21, 1987 & Jp-61 272 902 (Hitachi Ltd) Dec. 3, 1986.
IEEE Transactions on Magnetics, vol. 17, No. 5, Sep. 1981, N.Y. US "Cause of Quenching in Epoxy Impregnated Coils", pp. 1799-1802.
Experimental and theoretical investigation of mechanical disturbances in epoxy-impregnated superconducting coils Bobrov et al--Cryogenic 1985 vol. 25, Jun. pp. 307-316.
"Stress-induced epoxy cracking and energy release at 4.2 K in epoxy-coated superconducting wires" Yasaka et al pp. 423-428 Cryogenics (Aug. 1984).
"Experimental study of energy release due to cracking of epoxy impregnated conductors" Yanagi et al pp. 753-757 Cryogenics 1989 vol. 29 Jul.

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