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公开(公告)号：US10410780B2
公开(公告)日：2019-09-10
申请号：US14764273
申请日：2014-03-18
摘要： An iron powder for dust cores has an apparent density is 3.8 g/cm3 or more, a mean particle size (D50) is 80 μm or more, 60% or more of powder with a powder particle size of 100 μm or more has a mean grain size of 80 μm or more inside the powder particle, an area ratio of inclusions to a matrix phase of the powder is 0.4% or less, and a micro Vickers hardness (testing force: 0.245 N) of a powder cross-section is 90 Hv or less. It is thus possible to obtain iron powder for dust cores in order to manufacture a dust core that has low hysteresis loss even after the iron powder is formed and subjected to strain relief annealing.
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公开(公告)号：US20180071826A1
公开(公告)日：2018-03-15
申请号：US15561661
申请日：2016-03-14
发明人： Makoto Nakaseko , Yukiko Ozaki , Naomichi Nakamura
摘要： A method for producing a water-atomized metal powder, comprising applying water to a molten metal stream, dividing the molten metal stream into a metal powder, and cooling the metal powder, wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (MHF point).
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