Powder metallurgy processes – Forming articles by uniting randomly associated metal particles – Powder pretreatment
Patent
1994-12-07
1996-06-25
Walsh, Donald P.
Powder metallurgy processes
Forming articles by uniting randomly associated metal particles
Powder pretreatment
419 63, 419 64, 419 65, 419 66, 419 67, 419 68, 252 6254, B22F 706
Patent
active
055297471
ABSTRACT:
A formable composite magnetic flux concentrator material is composed of about 65% to 90% ferromagnetic material, such as iron powder, and about 35% to 10% binder, the binder being a mixture of an epoxy and one or more catalysts. The concentrator material is provided in a formable state as a putty-like body which can be worked into any desired shape dictated by the configuration of the induction heating coil used in a particular application. In one form, the density of the concentrator material is increased by application of vibration, compression and vacuum to de-air the material and to reduce voids therein. In another form, the iron powder comprises spherical-shaped particles and non-spherical shaped powders chosen in a ratio to maximize the density of material available.
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Exhibit A is an article entitled "High-Frequency Magnetic Materials", authored by W. J. Polydoroff, copyright 1960, published by John Wiley & Sons, Inc., New York, NY, pp. 1-9, which discloses magnetic materials and properties.
Exhibit B are product brochures entitled "Carpenter-Magnetic Alloys", published by Carpenter Technology, Carpenter Steel Division, Reading, Pennsylvania, including a product brochure on 49 alloy and on silicon iron core material, published Nov. 1988, and Mar. 1989, respectively.
Exhibit C is an article entitled "Production and Concentration of Magnetic Flux for Induction (Eddy Current) Heating Application", authored by Robert S. Ruffini, published in Industrial Heating magazine, Nov. 1994, pp. 41-45, which discloses various concentrator materials and magnetic flux characteristics.
Greaves John N.
Learflux Inc.
Walsh Donald P.
LandOfFree
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