Mg-CONTAINING OXIDE FILM-COATED IRON POWDER HAVING LOW COERCIVE FORCE, AND COMPOSITE SOFT MAGNETIC MATERIAL PRODUCED USING THE POWDER AND HAVING LOW COERCIVE FORCE AND LOW CORE LOSS

摘要

PROBLEM TO BE SOLVED: To provide Mg-containing oxide film-coated iron powder having low coercive force, and to provide a composite soft magnetic material produced using the powder and having low coercive force and low core loss.;SOLUTION: The Mg-containing oxide film-coated iron powder having low coercive force is obtained by coating the surface of raw material powder composed of polycrystal iron powder having crystal grains in which, provided that the cross-sectional area of iron powder is defined as S and the cross-sectional area of the maximum crystal grains among the crystal grains observed in the cross-section of the iron powder is defined as A_max, the A_max lies in the range of 0.5S to S with an Mg-containing oxide film having a componential composition satisfying Mg_1-XFe_XO (wherein 0≤X1) and a thickness of 10 to 500 nm. The composite soft magnetic material having low coercive force and low core loss is composed of a sintered compact obtained by subjecting the Mg-containing oxide film-coated iron powder to compression molding and thereafter performing firing.;COPYRIGHT: (C)2008,JPO&INPIT