Investigation of Magnetic Properties of Fe-25%Cr-10%Co-2%Mo-0,5%Si Powder Magnetic Alloy

T. Vompe1, I. Milyaev1, V. Yusupov1*
1A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia, 119991 Leninskii pr., 49
Hard magnetic materials of Fe-Cr-Co system are used widely in production of compact permanent magnets due to their magnetic and mechanic properties. The investigation of alloys with low content of expensive cobalt is an actual task. In this work the experimental investigation of the magnetic hysteresis properties (Br, Hc, (BH)max) of the magnetically hard powder alloy Fe-25%Cr-10%Co-2%Mo-0,5%Si was performed by the method of design of experiments (DOE). Starting temperature treatment and cooling rate in the magnetic field of the alloy were selected as variables. The samples were made by the methods of powder metallurgy. Regression equation for magnetic properties (Br, Hc, (BH)max), standardized Pareto charts and sections of the response surface plots were made by results of heat treatment according to selected variables of heat treatment. It was shown that the value of coercive force Hc and maximum energy product (BH)max are sensitive about starting temperature and cooling rate of the alloy, and residual induction Br are not sensitive about selected variables. The following magnetic hysteresis properties on this alloy make possible to receive values of coercive force Hc 14,8–30,8 kA/m, maximum energy product (BH)max 6,0–20,1 kJ/m3 and residual induction Br 1,20-1,35 T. The investigated alloy can be used as the material for rotor production for synchronous hysteresis motors.
Received: 10 February 2015   Revised: 08 April 2015   Accepted: 27 August 2015
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