WO2017033990A1 - Poudre de noyau magnétique et procédé de fabrication de noyau à poudre de fer - Google Patents

Poudre de noyau magnétique et procédé de fabrication de noyau à poudre de fer Download PDF

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WO2017033990A1
WO2017033990A1 PCT/JP2016/074755 JP2016074755W WO2017033990A1 WO 2017033990 A1 WO2017033990 A1 WO 2017033990A1 JP 2016074755 W JP2016074755 W JP 2016074755W WO 2017033990 A1 WO2017033990 A1 WO 2017033990A1
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Prior art keywords
powder
core
magnetic
mass
pure iron
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PCT/JP2016/074755
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English (en)
Japanese (ja)
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哲隆 加古
大平　晃也
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Ntn株式会社
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Priority claimed from JP2016162626A external-priority patent/JP2017043842A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017033990A1 publication Critical patent/WO2017033990A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/16—Metallic particles coated with a non-metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets

Definitions

  • the present invention relates to a powder for a magnetic core used for producing a dust core, and a method of manufacturing the dust core.
  • a powder magnetic core is used as a core of an electromagnetic component such as a reactor or a choke coil, and normally, a soft magnetic metal powder which has been subjected to an insulation treatment (in which each particle surface is covered with an insulation film) It is obtained by compacting a green compact by compressing a powder serving as a main raw material (hereinafter referred to as “powder for magnetic core”) and then subjecting the green compact to a heat treatment (annealing treatment).
  • a powder magnetic core has been used extensively in recent years because it has advantages such as a high degree of freedom in shape and easy to meet the demand for miniaturization and complicated shape.
  • patent document 1 heat-processes to the powder compact of the powder for magnetic cores containing the pure iron powder to which insulation processing was given, Sendust alloy powder, and a binder, and said pure iron powder It has a main phase formed by adhesion and firing of Sendust alloy powder and a grain boundary phase formed around the main phase with the binder as the main component, and the proportion of Sendust alloy in the main phase is 5% by mass or more and less than 20% by mass And a dust core is disclosed.
  • a dust core having the characteristics of low iron loss possessed by Sendust alloy powder added and mixed in an appropriate amount specifically It is possible to obtain a dust core having a magnetic flux density of 1 T or more at a magnetic field of 10 kA / m, a core loss of 20 W / kg or less at a magnetic flux density of 0.1 T and a frequency of 10 kHz.
  • Patent Document 2 discloses a pressure of a powder for a magnetic core containing an alloy powder containing at least Fe, Si and Al (for example, Sendust powder), and a pure iron powder having a Vickers hardness of 1/3 or less of the above alloy powder.
  • a powder magnetic core having an iron loss at 20 kHz of 82 kW / m 3 or less is disclosed.
  • Patent Document 2 pure iron powder in which the particle surface is coated with an insulating film is used as a technical means for achieving low iron loss of the dust core (paragraphs 0035 and 0059 of the same document, etc.), An appropriate amount of lubricant is included in the mixed powder (paragraphs 0040, 0046, etc. in the same document), and the like.
  • an object of the present invention is to enable stable production of a dust core with low core loss and high magnetic flux density and magnetic permeability.
  • the first invention of the present application invented to solve the above problems is a powder for a magnetic core used to produce a dust core, wherein the soft magnetic metal powder is coated with an insulating film on the surface of each particle. And an insulating film covering the particle surface of the soft magnetic metal powder including pure iron powder in which individual particle surfaces are not coated with the insulating film, the softening point of which exceeds 700 ° C .; 10 to 20 parts by mass of the pure iron powder is included with respect to 100 parts by mass of the metal powder.
  • soft magnetic metal powder in which individual particle surfaces are coated with an insulating film, and individual particle surfaces are not coated with an insulating film, and the metal surface is not
  • a powder for a magnetic core containing a pure iron powder exposed to the outside hereinafter also referred to as “coated pure iron powder”
  • coated pure iron powder for example, an iron-based alloy powder having high hardness compared to pure iron powder
  • the insulating coating constituting the coated metal powder has a softening point exceeding 700.degree.
  • an annealing process with a heating temperature set for example, in the range of about 600 to 700 ° C. is used for the core Even when applied to powder compacts, it is possible to prevent, as much as possible, the high iron loss of the dust core caused by the property change of the insulating film and the like.
  • the content of the coated pure iron powder is insufficient, it becomes difficult to sufficiently increase the magnetic flux density and the magnetic permeability of the dust core, and if the content of the coated pure iron powder is too large, The contact between the particles constituting the powder makes it easy to increase the eddy current loss (iron loss) of the dust core.
  • iron loss iron loss
  • a dust core having low core loss and high magnetic flux density and magnetic permeability specifically, iron loss at a magnetic flux density of 0.05 T and a frequency of 10 kHz It is possible to stably produce a dust core having a maximum magnetic permeability of 250 or more and a saturation magnetic flux density of 1.7 T or more at a magnetic field of 40 kA / m at 40 kW / m 3 or less.
  • the soft magnetic metal powder (the base material of the metal powder with a film) is at least one selected from the group consisting of pure iron powder, silicon steel powder, permendur powder and iron-based nanocrystalline powder. It is preferable to do. Further, in order to obtain a powder magnetic core having a low core loss and a high magnetic flux density and permeability, it is preferable to set the thickness of the insulating coating to 1 to 100 nm.
  • the powder for a magnetic core according to the present invention may further contain 0.3 to 5 parts by mass of a solid lubricant with respect to 100 parts by mass of the coated metal powder.
  • each particle surface is an individual particle relative to 100 parts by mass of soft magnetic metal powder coated with an insulating film having a softening point exceeding 700 ° C.
  • the powder for magnetic core contains pure iron powder not having an insulating film
  • the pure iron powder is oxidized or expanded. It is because distortion will occur and the dust core will become high iron loss.
  • the powder for magnetic core is preferably compression molded with a pressure of 980 MPa or more. This is for densifying the green compact and obtaining a dust core having excellent strength and magnetic properties.
  • the thickness of the insulating coating is preferably 1 to 100 nm, and the powder for a magnetic core is used with respect to 100 parts by mass of the soft magnetic metal powder in which the individual particle surfaces are covered with the insulating coating. It is preferable to further include 0.3 to 5 parts by mass of a solid lubricant.
  • the powder A for a magnetic core according to the present invention (see FIG. 1A) is used as a raw material powder for producing a dust core such as a core 1 for a choke coil (see FIG. 2).
  • the core 1 as a powder magnetic core is manufactured through a powder mixing process, a compression-molding process, and an annealing process in order, for example. Each step will be described in detail below.
  • Powder mixing process In this powder mixing step, a plurality of types of powders are mixed to obtain a powder A for a magnetic core for producing a dust core.
  • a powder A for a magnetic core for producing a dust core for the soft magnetic metal powder (hereinafter also referred to as “coated metal powder") in which individual particle surfaces are covered with an insulating film, the individual particle surfaces are not covered with the insulating film, and the metal surface is external
  • a powder for magnetic core A is obtained by adding and mixing a predetermined amount of pure iron powder (hereinafter also referred to as "coated pure iron powder") exposed to the solid lubricant and a solid lubricant.
  • Examples of the soft magnetic metal powder to be a base material of the coated metal powder include, in addition to pure iron powder having a purity of 97% or more, silicon steel (Fe-Si) powder, sendust (Fe-Al-Si) powder, Fe- At least one selected from the group of iron-based alloy powders represented by Al alloy powder, permalloy (Fe-Ni) powder, permendur (Fe-Co) powder, etc., iron-based amorphous powder, iron-based nanocrystalline powder, etc. Can be used.
  • pure iron powder, silicon steel powder, permendur powder and iron-based nanocrystalline powder are selected from among these because they have the advantage of easily obtaining a powder magnetic core having both high magnetic flux density and magnetic permeability. It is preferable to use any one or a mixture of two or more.
  • the soft magnetic metal powder has its particle size (strictly speaking, it is an average particle size based on the number, and here it is a value measured by a laser diffraction / disturbance method. The same applies to the case of “particle size” hereinafter). Even if it is too small or, conversely, too large, it is difficult to obtain a high density green compact and, consequently, a dust core excellent in mechanical strength and magnetic properties. Specifically, when a soft magnetic metal powder having a particle diameter as small as 40 ⁇ m or less is used, it becomes difficult to compact the powder for the magnetic core at a high density, and the hysteresis loss of the powder magnetic core (Iron loss) tends to be large.
  • the soft magnetic metal powder when a large particle size soft magnetic metal powder having a particle size exceeding 100 ⁇ m is used, the eddy current loss (iron loss) of the dust core tends to be large. Therefore, as the soft magnetic metal powder, one having a particle size of 40 ⁇ m to 100 ⁇ m is used.
  • an insulating film to be provided on the particle surface of the soft magnetic metal powder one having heat resistance such that no damage or property change occurs when the green compact is heated in the annealing step described later, specifically, it is softened A point whose temperature exceeds 700 ° C. is selected.
  • the insulating film having such heat resistance for example, a phosphate film containing at least one element selected from the group of Zn, Fe, Mn and Ca, B, Ca, Mg, Al, Si, Ti, An oxide film containing at least one element selected from the group of V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Mo and Bi, a crystal separated from a swellable layered clay mineral It is possible to adopt a film made of an aggregate or the like.
  • the insulating film may have a single-layer structure or a two-layer structure (laminated structure), and in the case of a two-layer structure, for example, a laminate of a phospho-oxide film and a silicone resin film, It is possible to employ a laminate of a phosphorylated oxidized film and a film composed of an aggregate of crystals cleaved from a swellable layered clay mineral.
  • the layered mineral exemplified above may be selected and used alone or in combination of two or more.
  • the film thickness of the insulating film is preferably 1 nm or more and 100 nm or less, and more preferably 1 nm or more and 20 nm or less.
  • the pure iron powder (coated pure iron powder) contained in the powder for magnetic core A is not particularly limited as long as it is generally available, but the purity is 97% or more and the atomizing method (gas atomizing method or water atomizing method) (Manufactured by atomized pure iron powder) are preferred. This is advantageous in reducing the loss and increasing the magnetic permeability of the dust core as the purity of iron is higher, and the iron powder produced by the atomization method may be produced by other production methods (for example, It is derived from being advantageous in enhancing the strength and magnetic properties of the powder core, as it is superior in removability of strain and plastic deformation (compression formability) compared to iron powder manufactured by reduction method and electrolysis method). Do.
  • the pure iron powder with a film diameter of 40 ⁇ m to 100 ⁇ m is also used. Is preferred.
  • the powder A for the magnetic core, and in turn the coated pure iron powder (particles of the coated pure iron powder) becomes uniform in the structure of the dust core.
  • the eddy current loss may increase due to the contact between particles of the pure iron powder without segregation. Therefore, as the non-coated pure iron powder, it is preferable to select and use one having the same particle size as that of the coated metal powder even within the above-mentioned particle size range.
  • the solid lubricant to be included in the powder for magnetic core A there is no particular limitation on the solid lubricant to be included in the powder for magnetic core A, and there is no particular limitation, for example, metal soaps such as aluminum stearate and zinc stearate, amide waxes such as stearic acid amide and bis stearic acid amide, graphite and molybdenum disulfide At least one selected from the group of inorganic solid lubricants and the like can be used.
  • the friction force between the molding die used for the compression molding process to be described later and the powder A for magnetic cores, and between the metal particles constituting the powder A for magnetic cores Since the frictional force can be reduced, the compressibility of the green compact can be improved, and also the durable life of the molding die can be improved.
  • coated pure iron powder and solid lubricant are added in an amount of 10 to 20 parts by mass and 0.3 to 5 parts by mass with respect to 100 parts by weight of the coated metal powder, respectively.
  • the powder for magnetic core A contains 10 to 20 parts by mass of pure iron powder without film and 0.3 to 5 parts by mass of solid lubricant with respect to 100 parts by mass of the coated metal powder.
  • the addition amount of the coated pure iron powder is set in the above range because, when the added amount of the coated pure iron powder is less than 10% by mass, the magnetic characteristics improvement effect of the powder magnetic core by including the powder (pressure In the case where the magnetic flux density and magnetic permeability of the powder core may not be sufficiently enjoyed, and the amount of the pure iron-free coated film exceeds 20% by mass, the particles of the powder contact each other, This is because the eddy current loss (iron loss) of the dust core is likely to increase.
  • the addition amount of the solid lubricant was set to said range. That is, the present inventors prepare a plurality of types of magnetic core powders different in addition amount (only) of the solid lubricant, and compression molding each magnetic core powder under the same conditions to obtain a green compact. Thereafter, the green density of each green compact, and the magnetic flux density (magnetic flux density at a magnetic field of 10 kA / m) of a green powder core obtained by annealing each green compact were measured.
  • a cylindrical (ring-shaped) green compact serving as a base of the core 1 is compression molded using a molding die 10 as schematically shown in FIGS. 1A and 1B. That is, as shown in FIG. 1A, after the powder filling portion (cavity) 15 defined by the core pin 11, the die 12 and the lower punch 14 is filled with the powder A for a magnetic core, as shown in FIG. Is moved relatively close to the lower punch 14 to compress the powder for magnetic core A to obtain a green compact A '.
  • the molding pressure of the powder for magnetic core A is 800 MPa or more, preferably 980 MPa or more.
  • the molding pressure is set to 800 to 2000 MPa, more preferably 980 to 2000 MPa.
  • an annealing process is performed in which the green compact A ′ placed in an appropriate atmosphere is heated at a predetermined temperature for a predetermined time.
  • the annealing treatment temperature of the green compact A ′ is 600 ° C. or more and 700 ° C. or less, preferably 650 ° C. or more and 700 ° C. or less. If the annealing temperature is less than 600 ° C., there is a possibility that the strain removal effect by performing the annealing can not be sufficiently obtained, and if the annealing temperature exceeds 700 ° C., the adjacent coating is produced.
  • the heating time (annealing treatment time) of the green compact A1 ′ depends on the size of the green compact A ′, but the heating time (for example, 5 ⁇ ) of the core portion of the green compact A ′ can be sufficiently heated. 60 minutes).
  • the annealing treatment is performed in an inert atmosphere such as nitrogen or argon. This is to prevent, as much as possible, the high iron loss of the dust core due to the oxidation and expansion of the coated pure iron powder contained in the green compact A ′.
  • the strain accumulated in the particles of the coated metal powder and the coated pure iron powder is appropriately removed, and the core 1 as a dust core having excellent magnetic properties is obtained. .
  • a soft magnetic metal powder in which individual particle surfaces are coated with an insulating film, and individual particle surfaces are not coated with an insulating film, and the metal surface is not Powder A for a magnetic core including a pure iron powder (coated pure iron powder) exposed to the outside, wherein the insulating coating constituting the coated metal powder has a softening point exceeding 700 ° C., and the coated metal powder A green compact A 'is compression molded using a magnetic core powder A to which 10 to 20 parts by mass of a coated pure iron powder is added per 100 parts by mass, and then the green compact A' is annealed.
  • the core 1 as a dust core was obtained.
  • an iron-based alloy powder having a higher hardness than pure iron powder is used as a base material of coated metal powder.
  • the possibility of damage to the insulating coating is reduced as much as possible.
  • the insulating coating constituting the coated metal powder has a softening point exceeding 700.degree. In this case, even if the green compact A ′ is subjected to an annealing process at a heating temperature set in the range of 600 ° C. to 700 ° C. as described above, high core loss of the core 1 caused by the characteristic change of the insulating film is obtained. It can be prevented as much as possible.
  • the content of the coated pure iron powder is insufficient, it becomes difficult to sufficiently increase the magnetic flux density and the magnetic permeability of the core 1, and if the content of the coated pure iron powder is too large, although the eddy current loss (iron loss) of the core 1 tends to increase due to the contact between the particles constituting the powder, 10 to 20 parts by mass of the pure iron powder is included with respect to 100 parts by mass of the coated metal powder. The occurrence of the various problems described above can be avoided as much as possible.
  • a dust core having a low core loss and high magnetic flux density and magnetic permeability (core 1), specifically, a magnetic flux density of 0.05 T and an iron loss at a frequency of 10 kHz of 40 kW
  • a powder magnetic core (core 1) having a maximum magnetic permeability of 250 or more and a saturation magnetic flux density of 1.7 T or more at a magnetic field of 40 kA / m can be stably produced at / m 3 or less.
  • a mold lubrication molding method in which a lubricant such as zinc stearate is attached to the inner wall surface (the defining surface of the cavity 15) of the mold 10, and the mold 10 at a predetermined temperature (maximum
  • the green compact A ′ may be compression molded by employing either or both of the warm molding methods of heating to about 120 ° C.).
  • the molding die 10 in particular, the one in which the defining surface of the cavity 15 is coated with a hard film such as DLC or titanium aluminum nitride (TiAlN) may be used. If the above means is adopted, it is easy to obtain a green compact A 'of higher density.
  • Magnetic flux density and (2) Maximum permeability The magnetic flux density at a magnetic field of 40 kA / m was measured using a direct current BH measuring device (SK-110 manufactured by Metron Giken Co., Ltd.), and the maximum permeability was simultaneously calculated. As the magnetic flux density and the maximum magnetic permeability are preferably as high as possible, the following evaluation points were given according to the measured value and the calculated value.
  • Example 1 100 parts by mass of pure iron powder (Somaloy 110i / 70 ⁇ m in average particle diameter manufactured by Haganes Japan) coated with an iron phosphate film as an insulating film is coated with an insulating film. 10 parts by mass of atomized pure iron powder (MH28N manufactured by Kobe Steel Co., Ltd./number average particle diameter 90 ⁇ m) and 0.3% by mass of bis (stearic acid amide) as a solid lubricant are added. Were mixed to obtain a powder for magnetic core.
  • pure iron powder Somaloy 110i / 70 ⁇ m in average particle diameter manufactured by Haganes Japan
  • MH28N manufactured by Kobe Steel Co., Ltd./number average particle diameter 90 ⁇ m
  • bis (stearic acid amide) 0.3% by mass of bis (stearic acid amide) as a solid lubricant
  • Example 1 The same as Example 1 except that the addition amount of the pure iron powder in which each particle surface is not coated with the insulating film is changed to 20 parts by mass.
  • Example 3 The same as Example 1 except that the molding pressure of the powder for magnetic core was 980 MPa.
  • Example 4 The same as Example 1 except that the molding pressure of the powder for a magnetic core was set to 1960 MPa.
  • Example 5 The same as Example 1 except that the molding temperature was 120 ° C.
  • Example 6 The same as Example 1 except that the treatment temperature of the annealing treatment was 600 ° C.
  • Example 7 The same as Example 1 except that the treatment temperature of the annealing treatment was 700 ° C.
  • Example 8 The pure iron powder in which each particle surface is not coated with the insulating film is changed from the atomized pure iron powder described above to a flat electrolytic pure iron powder (Myron PM250 manufactured by Toho Zinc Co., Ltd./number average particle diameter 90 ⁇ m) The same as Example 1 except for the above.
  • Comparative Example 1 The same as Example 1 except that the addition of pure iron powder in which individual particle surfaces are not coated with the insulating film is omitted.
  • Comparative Example 2 The same as Example 1 except that the addition amount of the pure iron powder in which each particle surface is not coated with the insulating film is 5 parts by mass.
  • Comparative Example 3 The same as Example 1 except that the addition amount of the pure iron powder in which each particle surface is not coated with the insulating film is 25 parts by mass.
  • Comparative Example 4 The same as Example 1 except that the molding pressure of the powder for magnetic core was 784 MPa.
  • Comparative Example 5 The same as Example 1 except that the molding temperature was 150 ° C.
  • Comparative Example 6 The same as Example 1 except that the treatment temperature of the annealing treatment was 550 ° C.
  • Comparative Example 7 The same as Example 1 except that the treatment temperature of the annealing treatment was 750 ° C.
  • Comparative Example 8 The same as Example 1 except that the annealing treatment was performed in the air atmosphere.
  • Comparative Example 9 Except that the pure iron powder whose individual particle surface is not coated with the insulating film is changed from the atomized pure iron powder described above to a flat electrolytic pure iron powder (Myron PG manufactured by Toho Zinc Co., Ltd. / number average particle diameter 40 ⁇ m) Is the same as in Example 1.
  • FIG. 3 simply shows a method of producing ring-shaped test pieces according to Example 1-8 and Comparative Example 1-9, and (1) magnetic flux density, (2) magnetic permeability of each ring-shaped test piece, The evaluation points of (3) iron loss and (4) radial crushing strength are shown.
  • the soft magnetic metal powder subjected to the insulation treatment is a pure iron powder (coated pure iron powder) not subjected to the insulation treatment. It is understood that the use of the powder for magnetic core added quantitatively is effective in realizing a dust core having a low core loss, a high magnetic flux density and a high magnetic permeability and a high strength.
  • the reason why the test piece according to Example 1-2 has a higher strength than the test piece according to Comparative Example 1-2 is mainly due to the use of powder for a magnetic core in which the amount of addition of the pure iron powder coated with a film is large. It is guessed that it is because it produced.
  • the pure iron powder is relatively soft, when the powder for the magnetic core is compressed, the particles are complexly entangled in a complicated manner, and with the execution of the annealing treatment at a predetermined temperature, the coated pure iron powder
  • the test piece according to Example 1-2 manufactured using the powder for a magnetic core having a relatively large amount of addition of the coated pure iron powder is, for example, because the sintering of the particles of each other is started, Comparative Example 1 It is presumed that the strength was higher than the test piece according to -2.
  • Example 3-4 and Comparative Example 4 it is effective to set the molding pressure of the powder for magnetic core in a predetermined range in order to achieve high magnetic flux density and high magnetic permeability of the dust core. It is understood that there is. Further, from the evaluation points of Example 5 and Comparative Example 5, it is understood that raising the molding temperature (the temperature of the molding die) to a predetermined temperature is effective in enhancing the magnetic characteristics of the dust core. Ru. In addition, from the evaluation points of Example 6-7 and Comparative Example 6-8, it is possible to appropriately set the conditions (treatment temperature and atmosphere) of the annealing treatment to reduce the iron loss and increase the magnetic flux density of the dust core. And it is understood that it is effective in achieving high permeability.
  • the powder type (and the particle diameter) of the pure iron powder not subjected to the insulation treatment to be added to the soft magnetic metal powder subjected to the insulation treatment is appropriate It is understood that it is important to select the above in order to improve the magnetic properties of the dust core (in particular, to reduce the iron loss).
  • the powder for magnetic core and the method for producing a dust core according to the present invention are extremely useful, which can make it possible to produce a high quality dust core having both high magnetic properties and strength.

Abstract

L'invention concerne une poudre de noyau magnétique A, destinée à être utilisée pour fabriquer un noyau à poudre de fer, qui contient : une poudre métallique faiblement magnétique présentant des surfaces de particules individuelles revêtues de revêtements isolants; et une poudre de fer pur présentant des surfaces de particules individuelles non revêtues de revêtements isolants. Les revêtements isolants revêtant les surfaces de particules de la poudre métallique faiblement magnétique ont chacun un point de ramollissement supérieur à 700 °C, et contiennent chacun de 10 à 20 parties en masse de poudre de fer pur par rapport à 100 parties en masse de la poudre métallique faiblement magnétique.
PCT/JP2016/074755 2015-08-26 2016-08-25 Poudre de noyau magnétique et procédé de fabrication de noyau à poudre de fer WO2017033990A1 (fr)

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JP2015-166755 2015-08-26
JP2015166755 2015-08-26
JP2016162626A JP2017043842A (ja) 2015-08-26 2016-08-23 磁心用粉末および圧粉磁心の製造方法
JP2016-162626 2016-08-23

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CN114823032B (zh) * 2022-05-19 2022-12-20 广东泛瑞新材料有限公司 一种合金磁芯及其制备方法和应用

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