COMPREHERED PULVER MAGNETERS, PULVER FOR MAGNETIC CEREALS AND THEIR MANUFACTURING PROCEDURES

摘要

An iron core is provided which can significantly reduce iron loss. The iron core of the present invention includes soft magnetic particles containing pure iron or an iron alloy and a grain boundary layer which exists between adjacent soft magnetic particles. The grain boundary layer has a composite layer which comprises MFeSiO (0 ≤ x ≤ 1, M: one or more types of metal elements which serve as divalent or divalent cations). Such an iron core is obtained by annealing or tempering a compact. The compact is obtained by compression molding a powder for magnetic cores or magnetic cores. In the powder for magnetic cores, the coating layers, which coat the surfaces of soft magnetic particles, each consist of a composite phase, whereby spinel-type ferrite, represented by MFeO (0 ≤ y ≤ 1, M: one or more types of metal elements, which serve as divalent or divalent cations), is dispersed on a surface of a silicone resin or inside the silicone resin. The iron core after annealing or annealing shows a high specific resistance due to the grain boundary layer with the composite layer and can reduce both the eddy current loss and the hysteresis loss.