Patent ID: 7622011
Filing Date: 2009-11-24
Classification: B22F,C22C,H01F

Abstract:
1. A sintered soft magnetic element, comprising: Fe-based sintered alloy soft magnetic material of metallic glass, the sintered soft magnetic element being prepared by sintering, in a temperature range of 573 K to the crystallization temperature (Tx), spherical particles of Fe-based metallic glass alloy prepared by an atomizing process, the spherical particles having a particle size of 30 to 125 μm; a composition consisting of, by atomic %, 0.5 to 10% of Ga, 7 to 15% of P, 3 to 7% of C, 3 to 7% of B and 1 to 7% of Si, with the remainder being Fe, the Fe-based metallic glass alloy having a crystallization temperature (Tx) of 770 to 800 K and a liquidus temperature (Tl) of 1220 to 1300 K, wherein the Fe-based sintered alloy soft magnetic material has metallic glass phase of high-density with a relative density of 99.0% or more, a magnetic permeability of 3900 (μmax) or more, a coercive force (Hc) of 19 (A/m) or less and a specific resistance of 1.6 μΩm or more in an as-sintered state, wherein the Fe-based sintered alloy soft magnetic material has a temperature interval of a supercooled liquid region (ΔTx) of 25 K or more, as expressed by a formula: ΔTx=Tx−Tg, wherein Tx is a crystallization temperature, and Tg is a glass transition temperature; and a reduced glass transition temperature of 0.59 or more, as expressed by a formula: Tg/Tl, wherein Tg is a glass transition temperature, and Tl is a liquidus temperature.