发明名称 |
METALLIC POWDER FOR POWDER MAGNETIC CORE AND PROCESS FOR PRODUCING POWDER MAGNETIC CORE |
摘要 |
A pure iron powder of a diameter of 10 to 500 µm and a purity of 99% by mass or more is heated to a temperature in the range of 600 to 1400°C, and a Si-concentrated layer is formed in regions within a depth of 5 µm from the surfaces of the powder particles by gas-phase reaction at a temperature of that range. The average Si concentration in the regions within this depth is controlled in the range of 0.05% to 2% by mass. Thus, a dust core metal powder enhancing the adhesion of insulating material to the particle without degrading compressibility is produced. The resulting dust core maintains a high saturation magnetic flux density and exhibits a low iron loss. |
申请公布号 |
EP2153921(A4) |
申请公布日期 |
2011.08.03 |
申请号 |
EP20080764948 |
申请日期 |
2008.05.26 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
FUJITA, AKIRA;HIRATANI, TATSUHIKO;MAETANI, TOSHIO |
分类号 |
B22F1/00;B22F1/02;B22F3/00;B22F3/24;H01F1/20;H01F41/02 |
主分类号 |
B22F1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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