Investigation of the frequency characteristics of composite iron powders with insulating oxide coatings

This article discusses methods for studying the frequency characteristics of composite iron powders with insulating oxide coatings. The main dependences hysteresis losses on induction a full cycle at magnetization reversal various cross-sections powders, sharply differing in shape curve and values magnetic characteristics, are studied, also range 50 Hz - 1 MHz figure merit inductance samples based composites considered from powder Hoganes ASC100.29 after annealing air, water vapor hydrogen temperature 400 ° С two hours. Based analysis dependencies, it can be explained by fact that material thin layer has lower electrical resistivity, which means total electromagnetic will greater due to an increase contribution eddy currents. At same time, permeability kHz differs 30 units, MHz, decreases 10-15% both materials. makes possible use iron-based soft materials engineering.