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

Inactive Publication Date: 2010-10-27
惠州市科力磁元有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is only because silicon and aluminum are prone to segregation and burning loss during smelting that they have not been widely used.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1) A 100Kg vacuum intermediate frequency induction furnace is used for iron-silicon-aluminum alloy smelting. First, industrial pure iron is melted, and then polysilicon, pure aluminum, and cerium-iron alloy are put into the vacuum induction furnace for smelting. Electromagnetic stirring is used to smelt FeSiAl alloy ingots. , The mass percentage content of the FeSiAl alloy ingot composition is: Si9%, Al 6.0%, Ce 0.02%, C 0.015%, O 2 0.010%, S 0.008%, P 0.035%, the rest is Fe.

[0015] 2) The alloy ingot is mechanically crushed into FeSiAl alloy powder, and sieved after high temperature heat treatment in a protective atmosphere, so that the mass percentage content of the FeSiAl alloy powder particle size composition is: -100~+140 mesh for 5%, -140~+200 The mesh accounts for 15%, -200~+300 mesh accounts for 45%, and -300 mesh accounts for 35%.

[0016] 3) Perform surface passivation treatment on the powder, extract 1000g of the above FeSiAl alloy powder, then pour 5g phosphor...

Embodiment 2

[0025] The production method is the same as that of Example 1. The alloy chemical composition is Si 9.56%, Al 5.4%, Ce 0.125%, C0.012%, O 2 0.010%, S 0.025%, P 0.032%, the rest is Fe, the pressing pressure is 23T / cm 2 , The heat treatment temperature is 690℃.

[0026] The alloy resistivity is 83.8×10 -6 Ω·m.

[0027] The magnetic parameters of the product of Example 2 are shown in Table 3.

[0028] Suppression ring size: outer diameter Φ16.50mm, inner diameter Φ10.15mm, height 6.35mm. Enameled wire wound inductance coil Φ0.5mm, 17 turns.

[0029] table 3

[0030]

[0031] Inductance 21.4μH corresponds to 74nH / N 2 Meets the permeability of 125.

[0032] The rate of change of permeability with temperature is shown in Table 4

[0033] Table 4

[0034]

Embodiment 3

[0036] The production method is the same as that in Example 1. The chemical composition is Si 9.80%, Al 5.62%, Ce 0.250%, C 0.008%, O 2 0.008%, S 0.028%, P 0.030%, the rest is Fe, the pressing pressure is 25T / cm 2 , Heat treatment temperature 640℃

[0037] The alloy resistivity is 85.2×10 -6 Ω·m.

[0038] The magnetic performance parameters of magnetic powder core products are shown in Table 5

[0039] Press size: outer diameter Φ33.0mm, inner diameter Φ19.95mm, height 11.20mm. Winding enameled wire of inductance coil Φ0.5mm, 33 turns.

[0040] table 5

[0041]

[0042] Inductance 149.2μH corresponds to inductance coefficient 137nH / N 2 Corresponding to a permeability of 125.

[0043] The rate of change of permeability with temperature is shown in Table 6

[0044] Table 6

[0045]

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02H01F1/22H01F41/02
Inventor 刘志文王锋蔡炳初
Owner 惠州市科力磁元有限公司
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