Manufacturing method of soft magnet silicon-aluminum alloy magnetic powder core with small amounts of rare earth element cerium or lanthanum

A rare earth element, silicon-aluminum alloy technology, used in the manufacture of inductors/transformers/magnets, electrical components, inorganic materials, etc., can solve the problems of not being widely used, easy to produce segregation and burning loss, etc. The effect of improving the resistance coefficient and reducing the power loss
CN101871071AInactive Publication Date: 2010-10-27惠州市科力磁元有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
惠州市科力磁元有限公司
Publication Date
2010-10-27
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a manufacturing method of a soft magnet silicon-aluminum alloy magnetic powder core with small amounts of rare earth element cerium or lanthanum, which comprises the following steps: 1) smelting industrial pure iron, polycrystalline silicon, pure aluminum, cerium-iron alloy or lanthanum-iron alloy in a vacuum induction furnace into FeSiAl alloy cast ingots with small amounts of cerium or lanthanum, wherein the alloy cast ingots comprise the components of 9.0-9.8% of Si, 5.4-6.0% of Al, 0.02-0.25% of Ce or La, 0.006-0.015% of C, 0.008-0.010% of O2, 0.008-0.028% of S, 0.03-0.035% of P and balance of Fe; and mechanically crushing into FeSiAl alloy powder, carrying out high-heat treatment in a shielding gas atmosphere, and then screening; 2) carrying out surface passivation treatment on the FeSiAl alloy powder with phosphoric acid and alcohol, then adding 0.20% of kaolin, 0.20% of lubricant and 0.50% of parting compound, uniformly mixing, and carrying out pressure forming; and 3) carrying out heat treatment and surface spraying. The invention can increase the resistivity of the magnetic core and reduce the high-frequency eddy current loss, and has lower magnetic core loss. Besides, the invention improves the temperature stability of the magnetic permeability, and enables the decline of the magnetic permeability to be less than 3% when the working temperature rises to 125 DEG C.
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Description

Technical field

[0001] The invention relates to a manufacturing method of a magnetic object, in particular to a manufacturing method of a soft magnet silicon-aluminum alloy magnetic powder core added with a small amount of rare earth element cerium or lanthanum. This kind of magnetic powder core has a very wide range of applications, mainly suitable for PFC inductors and output filter inductors in LED power supplies, switching power supplies and UPS, differential mode inductors in EMI filters, main transformers in flyback converters and other pulse transformers. Background technique

[0002] The iron-silicon aluminum alloy has excellent soft magnetic properties and was discovered by the Japanese as early as the 1930s, especially the alloy with a specific composition of Si~9.6%, Al~5.4%, and the balance of Fe, with a μm value of 16 Wan, was named Sendust alloy. Just because silicon and aluminum are prone to segregation and burnout during smelting, they have not been widely used. ...

Claims

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