Wound magnetic core

Details Wound magnetic core Wound magnetic core

H - Electricity

01

F

148/4, 336/69, 3

H01F 1/047 (2006.01) H01F 1/153 (2006.01) H01F 3/04 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2009079

A wound magnetic core constituted by (a) a thin ribbon made of a fine crystalline, soft magnetic Fe-base alloy having the composition represented by the general formula: (Fe1-aMa)100-x-y-z-.alpha.CuxSiyBzM'.alpha. wherein M is Co and/or Ni, M' is at least one element selected from the group consisting of Nb, W, Ta, Zr, Hf, Ti and Mo, and a, x, y, z and .alpha. respectively satisfy 0?a?0.5, 0.1?x?3, 0?y?30, 0?z?25, 5?y+z?30 and 0.1?.alpha.?30, at least 50% of the alloy structure being occupied by fine crystal grains having an average grain size of 1000.ANG. or less; and (b) a heat-resistant insulating layer having a thickness of 0.5-5 µm formed on at least one surface of the thin ribbon, the heat-resistant insulating layer being made of a uniform mixture of 20-90 weight %, as SiO2, of a silanol oligomer and 80-10 weight % of fine ceramic particles, which is subjected to a heat treatment to cross-link the silanol oligomer.

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