Method for producing soft magnetic metal powder coated with Mg-containing oxide film and method for producing composite soft magnetic material from the powder

A manufacturing method and technology of metal powders, which are applied in the manufacture of inductors/transformers/magnets, inorganic material magnetism, electrical components, etc., can solve the problem of low specific resistance of composite soft magnetic materials, expensive composite soft magnetic metal powder, and insufficient insulation effect. And other issues

Inactive Publication Date: 2007-10-17
MITSUBISHI MATERIALS PMG CORP
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  • Abstract
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Problems solved by technology

[0009] The method of forming a MgO insulating film on the soft magnetic metal powder by wet methods such as electroless plating and coating to make a composite soft magnetic metal powder is expensive and difficult to mass-produce, so the composite soft magnetic metal powder produced by this method The magnetic metal powder is expensive, and the composite soft magnetic material made of this expensive composite soft magnetic alloy powder has the disadvantage of being expensive
In addition, the MgO insulating film of the composite soft magnetic metal powder produced by this method is more stable than the soft magnetic metal powder, so it is difficult for diffusion reaction to take place between the MgO insulating film and the surface of the soft magnetic metal powder. The adhesion between the surfaces of the soft magnetic metal powder is insufficient, and if the composite soft magnetic metal powder produced by this wet method is extruded, the MgO insulating film cannot exert sufficient insulating effect due to cracking or the like during extrusion molding. According to the composite soft magnetic metal powder produced by the wet method, the composite soft magnetic material produced from it has the disadvantage that sufficient high impedance cannot be obtained.
[0010] On the other hand, the method of adding insulating certain Mg ferrite powder in the soft magnetic metal powder, mixing and extruding and calcining can improve the cheap composite soft magnetic material because the manufacturing cost is low, but according to this The composite soft magnetic material that the method is made can have the structure that MgO is concentrated in the triple grain boundary point of metal soft magnetic particle, and MgO is dispersed in grain boundary uniformly less, so the shortcoming that the specific resistance of the composite soft magnetic material that is obtained is low
[0011] In addition, the above-mentioned conventional composite soft magnetic sintered material obtained by adding a high-resistivity substance to iron powder and sintering is particularly insufficient in its electrical resistivity within its density, flexural strength, electrical resistivity, and magnetic flux density. Composite soft magnetic sintered materials with higher resistivity are also required

Method used

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  • Method for producing soft magnetic metal powder coated with Mg-containing oxide film and method for producing composite soft magnetic material from the powder
  • Method for producing soft magnetic metal powder coated with Mg-containing oxide film and method for producing composite soft magnetic material from the powder
  • Method for producing soft magnetic metal powder coated with Mg-containing oxide film and method for producing composite soft magnetic material from the powder

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Effect test

Embodiment 1

[0095] According to the blending ratio shown in Table 1, Mg powder was blended with the soft magnetic powder A (pure iron powder) that had been oxidized under the conditions shown in Table 1, and the blended powder was kept on the table in an argon or vacuum atmosphere. Rotation is performed at the pressure and temperature shown in 1 to produce Mg-containing oxide film-coated soft magnetic metal powder.

[0096] The obtained Mg-containing oxide film-coated soft magnetic metal powder was placed into a metal die for extrusion molding, and formed into a plate-shaped compact having dimensions of length: 55 mm, width: 10 mm, and thickness: 5 mm, and having an outer diameter: 35 mm, Inner diameter: 25mm, height: 5mm, the resulting compact is calcined in a nitrogen atmosphere at the temperature shown in Table 1 for 30 minutes to produce a plate-shaped and ring-shaped calcined body. The composite soft magnetic material of the present invention was implemented with methods 1 to 7 and compar...

example 1

[0098] According to the blending ratio shown in Table 1, Mg ferrite powder was blended with the soft magnetic powder A prepared in the example, and the blended powder was stirred while rotating in the atmosphere to produce a mixed powder. The obtained mixed powder was put into a metal die for extrusion molding, and formed into a plate-shaped compact having dimensions of length: 55mm, width: 10mm, and thickness: 5mm, and having outer diameter: 35mm, inner diameter: 25mm, and height: 5mm The annular compact of this size was calcined in a nitrogen atmosphere at the temperature shown in Table 1 for 30 minutes to produce a composite soft magnetic material composed of a plate-shaped and annular calcined body. Existing method 1. The relative density, resistivity, and flexural strength of the composite soft magnetic material composed of the plate-shaped calcined body obtained by the conventional method 1 were measured, and the results are shown in Table 1. In addition, the composite soft ...

Embodiment 2

[0108] According to the blending ratio shown in Table 3, Mg powder was blended with the soft magnetic powder B (Fe-Al iron-based soft magnetic alloy powder) subjected to the oxidation treatment under the conditions shown in Table 3, and the blended powder was exposed to argon gas. Or, in a vacuum atmosphere, the Mg-containing oxide film-coated soft magnetic metal powder was produced by keeping it at the pressure and temperature shown in Table 3 and rotating it.

[0109] The obtained Mg-containing oxide film-coated soft magnetic metal powder was placed into a metal die for extrusion molding, and formed into a plate-shaped compact having dimensions of 55 mm in length, 10 mm in width, and 5 mm in thickness, and an outer diameter of 35 mm, Inner diameter: 25mm, height: 5mm ring-shaped compact, the resulting compact is calcined in a nitrogen atmosphere at the temperature shown in Table 3 for 30 minutes to produce a plate-shaped and ring-shaped calcined body The composite soft magnetic ...

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Abstract

The invention provides a manufacturing method of a composite soft magnetic metal powder which is coated with a magnesium-containing oxide film and a method which adopts the composite soft magnetic metal powder which is coated with a magnesium-containing oxide film for manufacturing a composite soft magnetic material. In the atmosphere of oxidation, the Mg powder is added in the soft magnetic metal powder which is the heat processed under the temperature of 40 to 500 DEG C for mixing; the mixed powder is heated in the atmosphere of inert gas or the vacuum atmosphere at the temperature of 150 to 1100 DEG C and the pressure of 1 multiplied by 10 to 1 multiplied by 10 MPa, or the mixed powder is heated and rotated simultaneously, then the composite soft magnetic metal powder which is coated with the magnesium-containing oxide film is manufactured, and the composite soft magnetic material is manufactured by using the composite soft magnetic metal powder which is coated with the magnesium-containing oxide film.

Description

Technical field [0001] The present invention relates to a method for manufacturing Mg-containing oxide film coated soft magnetic metal powder and a method for manufacturing a composite soft magnetic material by using the Mg-containing oxide film coated soft magnetic metal powder produced according to the method. The composite soft magnetic material is used as a magnetic core, for example, Motor core, generator core, solenoid core (solenoid core), ignition core (ignition core), reactor core (reactor core), transformer core (transformer core), choke coil core (choke coil core) ) Or magnetic sensor cores (sensor core) and other electromagnetic circuit components. [0002] In addition, the present invention also relates to a raw material powder for manufacturing the Mg-containing oxide film coated soft magnetic metal powder. Background technique [0003] It is generally believed that the magnetic core, motor core, generator core, solenoid core, ignition coil core, reactor core, trans...

Claims

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Application Information

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IPC IPC(8): B22F1/02C22C33/02H01F1/20H01F1/33H01F41/02C22C38/00
Inventor 渡边宗明中山亮治鱼住学司
Owner MITSUBISHI MATERIALS PMG CORP
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