Coating processes – Electrical product produced – Superconductor
Patent
1988-03-10
1993-09-21
Silverberg, Sam
Coating processes
Electrical product produced
Superconductor
427118, B05D 512
Patent
active
052467295
ABSTRACT:
The composite insulation coating consists of a mixture of glass and ceramic oxide(s), coated onto a wire by conventional wire enameling techniques followed by heat treatment at 600.degree.-850.degree. C. The enamel when initially applied, the "green" coat slurry, consists of four components: (1) the glass, (2) an inorganic filler (ceramic oxide powder, (3) an organic binder and (4) an organic solvent. The glasses can be selected from several commercial glasses (Corning 7570 and 7050) as well as Westinghouse glasses A-508, M 3072 and M 3073. None of these glasses contain lead or boron, allowing for nuclear applications. Suitable ceramic fillers are alumina, and the CeramPhysics, Inc. ceramics SC1C and SC1A. Organic binder materials and solvents are used. It is preferable that a copper wire to be coated with Ni, Inconel or Cr prior to coating with the subject insulation. For superconductors, the brittle nature of Nb.sub.3 Sn wire and the high reaction temperature (.about.700.degree. C.) required to form it preclude the use of standard organic insulation systems. The inorganic insulation with SC1C and SC1A ceramics, characterized by unusually high specific heats and thermal conductivities at cryogenic temperatures, offers the opportunity of providing increased enthalpy stabilization in a superconducting winding. The glass and ceramic is chosen so that the vitrification temperature of the composite coincides with the reaction temperature of 600.degree.-800 .degree. C. The most successful glasses meeting this criterion are A-508 and M3072.
REFERENCES:
patent: 3078186 (1963-02-01), Tierney
patent: 3089787 (1963-05-01), Sattler et al.
patent: 3109053 (1963-10-01), Ahearn
patent: 3119897 (1964-01-01), Coper
patent: 3222219 (1965-12-01), Saunders et al.
patent: 3223553 (1965-12-01), Morey
patent: 3291638 (1966-12-01), Stadlen et al.
patent: 3442702 (1969-05-01), Pendleton et al.
patent: 3446660 (1969-05-01), Pendleton
patent: 3749811 (1973-07-01), Bogner et al.
patent: 3883370 (1975-05-01), Kanter
patent: 3985281 (1976-10-01), Diepers
patent: 4178677 (1979-12-01), Weisse
patent: 4261097 (1979-08-01), Weisse
patent: 4407062 (1983-10-01), Sutcliffe et al.
patent: 4429007 (1984-01-01), Bich et al.
W. N. Lawless et al., "Enthalpy-Improved Dielectric Insulation for Supercucting Wires", AFWAL-TR-82-2056, May 1982, Aero Propulsion Laboratory, Wright-Patterson AFB OH 45433.
Encyclopedia of Chemical Technology, Ed. by Kirk Othmer, 3rd ed., vol. 11, pp. 807-890.
T. Gupta et al., "Dielectric Insulation for Superconductors", AFWAL-TR-85-2070, Sep. 1985, Wright Laboratories, Wright-Patterson AFB OH 45433.
Bich George J.
Gupta Tapan K.
Lawless William N.
Franz Bernard E.
Silverberg Sam
Singer Donald J.
United States of America as represented by the Secretary of the
LandOfFree
Method of coating superconductors with inorganic insulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of coating superconductors with inorganic insulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of coating superconductors with inorganic insulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1048255