A dust core that can significantly reduce the iron loss is provided. The dust core of the present invention includes soft magnetic particles comprising pure iron or an iron alloy and a grain boundary layer existing between adjacent soft magnetic particles. The grain boundary layer has a compound layer comprising MxFe2-xSiO4 (0≤x≤1, M: one or more types of metal elements that serve as divalent cations). Such a dust core is obtained by annealing a compact. The compact is obtained by compression-molding a powder for magnetic cores. In the powder for magnetic cores, coating layers that coat the surfaces of soft magnetic particles are each composed of a composite phase in which spinel-type ferrite represented by MyFe3-yO4 (0≤y≤1, M: one or more types of metal elements that serve as divalent cations) is dispersed on a surface of a silicone resin or inside the silicone resin. The dust core after annealing exhibits a high specific resistance due to the grain boundary layer having the compound layer and can reduce both the eddy-current loss and the hysteresis loss.
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机译：提供了可以显着降低铁损的粉尘芯。本发明的除尘芯包括包含纯铁或铁合金的软磁颗粒和存在于相邻的软磁颗粒之间的晶界层。晶界层具有包含M X / Sub> Fe 2-x / sub> SiO 4 （0≤x≤1，m：一个或多个的复合层用作二价阳离子的金属元素的类型）。通过退火紧凑而获得这种粉尘芯。该紧凑型通过压缩粉末用于磁芯而获得。在磁芯的粉末中，涂覆软磁性颗粒表面的涂层各自由复合相组成，其中M Y FE 3-Y表示的尖晶石型铁氧体组成.3-Y O 4 （0≤y≤1，m：用作二价阳离子的一种或多种金属元素）分散在有机硅树脂或硅树脂内部的表面上。由于具有化合物层的晶界层，退火后的粉尘芯具有高比电阻，并且可以减少涡流损耗和滞后损失。
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