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.

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.