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Unit block used in manufacturing core with soft magnetic metal powder, and method for manufacturing core with high current DC bias characteristics using the unit block

A technology of metal powder and unit block, applied in the direction of magnetic core/yoke, inductor/transformer/magnet manufacturing, circuit, etc.

Inactive Publication Date: 2006-11-29
CHANG SUNG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, high current DC bias characteristics are slightly worse than FeNiMo cores or high flux cores

Method used

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  • Unit block used in manufacturing core with soft magnetic metal powder, and method for manufacturing core with high current DC bias characteristics using the unit block
  • Unit block used in manufacturing core with soft magnetic metal powder, and method for manufacturing core with high current DC bias characteristics using the unit block
  • Unit block used in manufacturing core with soft magnetic metal powder, and method for manufacturing core with high current DC bias characteristics using the unit block

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preparation example Construction

[0030] The preparation of the soft magnetic metal powder of the present invention will be described below.

[0031] The sendust powder used in the present invention was prepared according to the same method of Korean Patent Application No. 1998-62927 done by the applicant of the present invention, and the preparation of the powder is briefly described below.

[0032]Use a jaw crusher, a rotary crusher or a hammer mill to crush the sendust aluminum alloy ingot, which has high magnetic permeability and low loss properties, and is composed of 9.6% Si, 5.4 % of aluminum and the rest of Fe; treated with a ball mill for 1 hour, heat treated at 800°C to 900°C for 8 hours in a mixed gas atmosphere of hydrogen and nitrogen. The sendust powder is prepared by treating the heat-treated powder by wet insulating coating using 1.0 wt% to 2.0 wt% insulating ceramic or by dry insulating coating using a low melting point ceramic binder.

[0033] The preparation of high-throughput powder consis...

Embodiment 1

[0046] A sendust ingot having high magnetic permeability and low loss characteristics and composed of 9.6% by weight of Si, Composition of 5.4% by weight of Al and the balance of Fe. Preparation of sendust powder is accomplished by treating sendust powder by wet insulating coating using 1.0% by weight of mixed ceramics or by dry insulating coating using glass frit (Korean Patent Application No. 1998 -62927).

[0047] After adding a lubricant to the coated sendust powder, the obtained powder is pressed into a unit block with a length of 60 mm, a width of 30 mm and a height of 20 mm with a high pressing pressure of 100 tons to 500 tons, and then heated at 700 ° C Heat treatment at ~800° C. for 1 hour in a nitrogen atmosphere, so as to complete the manufacture of the unit block for the magnetic core.

Embodiment 2

[0049] Preparation of FeNiMo powder (Korean Patent Application No. 1997-0009412) was accomplished by treating the powder (FeNiMo) by wet insulating coating with 1.0% by weight of mixed ceramics, the powder (FeNiMo) Molybdenum) has a particle size equal to or less than 300 mesh (50 μm), is produced by a spray method, and consists of 2% Mo, 80% Ni and the balance Fe.

[0050] After adding stearic acid as a lubricant to the coated iron-nickel-molybdenum powder, the resulting powder is pressed into a unit block with a length of 60 mm, a width of 30 mm, and a height of 20 mm at a high pressing pressure of 100 tons to 500 tons, Then heat treatment at 700° C.-800° C. for 1 hour in a nitrogen atmosphere, so as to complete the manufacture of the unit block for the magnetic core.

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Abstract

A unit block for a core using soft magnetic metal powder, a core having excellent high-current DC bias characteristics using the unit block, and a method of producing the core are disclosed. The unit block is used to produce cores applied to an active filter for PFC, a three-phase line reactor, or an inductor for automotive electronics. A method of producing the core comprises mixing sendust alloy, High Flux, MPP, or silicon steel powders, which have an average particle size of 175 gm or less, with a solid lubricant; compacting a mixture at a pressure of 10 - 18 tons per unit area; heat-treating the compacted mixture at 600 - 800'C for 1 - 2 hours to form the unit blocks each having a length of 3 - 10 cm, a width of 1 - 5 cm, and a height of 1 - 5 cm; and attaching the unit blocks using a heat- and fire-resistant adhesive.

Description

technical field [0001] The present invention relates to a unit block for a magnetic core using soft magnetic metal powder, a magnetic core having excellent high-current direct current (DC) bias characteristics using the unit block, and a method of manufacturing the magnetic core. More particularly, the present invention relates to a unit block for a magnetic core using soft magnetic metal powder, a magnetic core having excellent large-current DC bias characteristics using the unit block, and a method of manufacturing the magnetic core, wherein, The unit block is used to manufacture a magnetic core, which can be applied to active filters for PFC (power factor correction) (inductors for high-current step-down or high-current step-up), three-phase lines Reactors or inductors for automotive electronics using fuel cell systems. Background technique [0002] Used in active filters for PFC (power factor correction) (inductors for high-current step-down or high-current step-up), th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F3/04H01F3/08H01F41/02
CPCH01F41/0246H01F3/08Y10T428/12014H01F3/04
Inventor 朴在烈俞奉基李泰京
Owner CHANG SUNG CO LTD
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