This presentation describes recent improvements in materials for magnetic flux control. Materials of Fluxtrol and Ferrotron families became the premium composite materials for magnetic flux control in induction heat treating systems. New material, Fluxtrol LF, is now available for lower range of induction frequencies used for heat treating. This material has excellent machinability and mechanical strength. Material has high thermal conductivity and temperature resistance that allow us to use it in heavy loaded applications with direct internal or contact cooling. Magnetic properties of Fluxtrol LF are also very good:  high saturation flux density, permeability up to 160 and low magnetic losses in recommended frequency range. Relatively low electrical resistance limits application of Fluxtrol LF to lower frequency range than other Fluxtrol materials.

Along with the description of new materials, this presentation contains information about recent improvements in application of standard Fluxtrol materials. One of them is impregnation of magnetic concentrators. This advanced technology consists in vacuum treatment of the parts with subsequent placing them into a bath of a special resin. Resin penetrates into the material pores and polymerizes inside of them. Impregnated material has higher mechanical strength and improved corrosion resistance.