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WO2018179812A1 - Noyau à poudre de fer - Google Patents

Noyau à poudre de fer Download PDF

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Publication number
WO2018179812A1
WO2018179812A1 PCT/JP2018/003281 JP2018003281W WO2018179812A1 WO 2018179812 A1 WO2018179812 A1 WO 2018179812A1 JP 2018003281 W JP2018003281 W JP 2018003281W WO 2018179812 A1 WO2018179812 A1 WO 2018179812A1
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WO
WIPO (PCT)
Prior art keywords
particle group
powder
particle
dust core
soft magnetic
Prior art date
Application number
PCT/JP2018/003281
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English (en)
Japanese (ja)
Inventor
晶 二階堂
暁太朗 阿部
祐 米澤
丈弘 郷原
和宏 吉留
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Tdk株式会社
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Application filed by Tdk株式会社 filed Critical Tdk株式会社
Publication of WO2018179812A1 publication Critical patent/WO2018179812A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • H01F1/147—Alloys characterised by their composition
    • 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
    • H01F1/26—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 by macromolecular organic substances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles

Definitions

  • the present invention relates to a dust core, and more particularly to a dust core having good permeability and direct current superposition characteristics.
  • Electric and electronic devices are becoming more and more compact, and along with that, small and highly efficient magnetic cores are required.
  • magnetic core materials for reactors and inductors used in applications where high current is applied laminated magnetic steel sheets, ferrite cores, and powder magnetic cores formed from soft magnetic powder (molded, injection molded, sheet molded, etc.) Etc.) are used.
  • the laminated magnetic steel sheet has a high saturation magnetic flux density, there is a problem that when the driving frequency of the power supply circuit exceeds several tens of kHz, the iron loss increases and the efficiency decreases.
  • the ferrite core is a magnetic core material with a small high-frequency loss, but there is a problem that the shape is increased because the saturation magnetic flux density is low.
  • Powder magnetic cores formed from soft magnetic powder are widely used because the high-frequency iron loss is smaller than that of laminated electrical steel sheets and the saturation magnetic flux density is larger than that of ferrite cores.
  • the magnetic permeability is excellent in a high magnetic field on which direct current is superimposed, that is, the direct current superposition characteristics are excellent.
  • the idea of increasing the relative density of the powder magnetic core by mixing and pressing a relatively coarse powder and a fine powder Various proposals have been made.
  • the particle size distribution of the powder becomes bimodal or multimodal and has a plurality of peaks. It is considered that the relative density is increased as compared with particles having a single mode distribution by filling the gaps of the coarse powder with the fine powder.
  • the magnetic anisotropy derived from the shape of the powder affects the direct current superposition characteristics of the dust core.
  • Patent Document 1 Japanese Patent Laid-Open No. 2016-12630 discloses a coarse powder which is an amorphous soft magnetic powder having an average particle size of 50 ⁇ m to 120 ⁇ m and an aspect ratio of 1 to 6, and an average particle size of 1 ⁇ m.
  • a dust core made of a mixed powder obtained by mixing fine powder, which is an amorphous soft magnetic powder having an aspect ratio of 4 or more and 15 or less and having an aspect ratio of 4 to 15 is disclosed.
  • the relative density of the powder magnetic core is improved by mixing coarse powder and fine powder.
  • particles with a high aspect ratio have a limit in improving the filling rate, and because of the magnetic anisotropy derived from the shape, it is difficult to achieve both high magnetic permeability and excellent DC superposition characteristics.
  • the present invention has been made in view of the above prior art, and aims to realize high magnetic permeability and excellent DC superposition characteristics in a dust core composed of soft magnetic powder and resin.
  • the inventors of the present invention have continually studied to improve the permeability and direct current superimposition characteristics of the powder magnetic core. As a result, the filling rate is improved by configuring the magnetic powder to be filled with coarse particles and fine particles.
  • the direct current superimposition characteristics can be improved by controlling the shape of the fine particles. That is, instead of using rod-like or needle-like fine grains having a high aspect ratio as in Patent Document 1, DC superposition characteristics are improved by using coarse grains and fine grains having a circularity in a predetermined range. As a result, the present invention has been completed.
  • the present invention includes the following gist.
  • a dust core containing soft magnetic powder and resin When polishing and observing the cross section of the dust core, When the particle size distribution of the soft magnetic powder has a plurality of peaks, and the particle group belonging to the peak with the largest particle size is defined as the particle group ⁇ and the particle group ⁇ belonging to the peak with the smallest particle size, the average of the particle group ⁇ A dust core having a circularity of 1 to 0.8 and an average circularity of the particle group ⁇ of 0.8 to 0.4.
  • the ratio of the area A occupied by the particle group ⁇ to the area B occupied by the particle group ⁇ in the cross section of the powder magnetic core, A / B is 9 to 1.5, (1) .
  • the sum of the area A occupied by the particle group ⁇ and the area B occupied by the particle group ⁇ in the cross section of the dust core is 100 to 50% of the total area of the soft magnetic powder (1) or (2 ).
  • the particle group ⁇ has a particle size of 10 ⁇ m or more and 50 ⁇ m or less and the particle group ⁇ has a particle size of 0.5 ⁇ m or more and less than 10 ⁇ m in the cross section of the dust core.
  • the dust core of the present invention includes soft magnetic powder and resin.
  • the soft magnetic powder is composed of a plurality of particle groups having different particle sizes and shapes. That is, the soft magnetic powder includes substantially spherical coarse particles and fine particles having low circularity.
  • the filling rate of the soft magnetic powder is improved and the magnetic permeability is improved.
  • the direct current superimposition characteristic is improved by using a magnetic powder having a circularity in a predetermined range as a fine particle.
  • FIG. 1 schematically shows the particle size distribution of a soft magnetic powder showing two peaks.
  • the soft magnetic powder constituting the dust core according to the present embodiment includes coarse particles and fine particles.
  • An insulating coating may be formed on the soft magnetic powder.
  • Such a powder magnetic core is preferably used as a magnetic core of a coil-type electronic component.
  • a coil-type electronic component in which an air-core coil around which a wire is wound is embedded in a dust core having a predetermined shape, or a wire may be wound on a surface of a dust core having a predetermined shape. It may be a coil-type electronic component that is wound only.
  • the shape of the magnetic core around which the wire is wound include FT type, ET type, EI type, UU type, EE type, EER type, UI type, drum type, toroidal type, pot type, and cup type. it can.
  • the soft magnetic powder in the present embodiment exhibits a particle size distribution having at least two peaks. Specifically, when the cross section of the powder magnetic core is polished and observed, the particle size distribution of the soft magnetic powder has a plurality of peaks.
  • FIG. 1 schematically shows the particle size distribution of soft magnetic powder showing two peaks.
  • Coarse particles belonging to the peak P ⁇ having the largest soot particle size are defined as a particle group ⁇ .
  • “Belonging to the peak P ⁇ ” means that the particle size distribution is included in the region from the bottom where the peak rises to the peak top through the peak top, and until the distribution curve returns almost horizontally on the large particle size side. Means group.
  • particles contained within ⁇ 50% of the particle size of the peak P ⁇ can be defined as the particle group ⁇ . In this case, when the peak particle size is 10 ⁇ m, it means particles having a particle size of 5 to 15 ⁇ m.
  • coarse particles belonging to the peak P ⁇ having the smallest particle size are defined as a particle group ⁇ .
  • the peak means a peak in which the number of frequencies belonging to the peak is 5% or more of the total frequency. Therefore, a minute peak such as noise is not regarded as a peak in the above description. For example, even if a minute peak such as noise is present on the larger particle diameter side than the peak P ⁇ having the largest particle diameter, it is not regarded as a peak in the present invention.
  • the peak may have a shoulder. The shoulder is also considered to belong to the peak.
  • the average circularity of the particle group ⁇ is 1 to 0.8, and the average circularity of the particle group ⁇ is 0.8 to 0.4.
  • the circularity in this embodiment means Wadell's circularity.
  • Wadell's circularity is defined by the ratio of the diameter of a circle (equivalent circle diameter) equal to the projected area of the particle cross section to the diameter of the circle circumscribing the particle cross section (equivalent circle diameter / diameter of circumscribed circle). In the case of a perfect circle, Wadell's circularity is 1, and the closer to 1, the higher the roundness.
  • An optical microscope or SEM can be used for observation, and image analysis can be used for calculation of circularity.
  • the circularity is calculated for 20 or more particles arbitrarily selected from the particles belonging to each particle group, and the average value is set as the average circularity of the particle group.
  • the high degree of circularity of the coarse particles (particle group ⁇ ) makes it easy for the fine particles (particle group ⁇ ) to flow in the vicinity of the coarse particles during compacting, and the fine particles are easily filled in the gaps between the coarse particles.
  • the circularity of the fine particles (particle group ⁇ ) is in the above range, the direct current superimposition characteristics are improved. That is, in this embodiment, the soft magnetic powder filled in the dust core is composed of coarse particles and fine particles, so that the filling rate is improved and the magnetic permeability is improved.
  • the direct current superimposition characteristic is improved by using a magnetic powder having a circularity in a predetermined range as a fine particle.
  • the ratio (A / B) of the area A occupied by the particle group ⁇ and the area B occupied by the particle group ⁇ in the cross section of the dust core is preferably 9 to 1.5, more preferably 5. It is in the range of 7 to 2.3. In terms of the ratio of area A to area B (A: B), it is preferably in the range of 9: 1 to 6: 4, more preferably 8.5: 1.5 to 7: 3. That is, a relatively large amount of coarse particles (particle group ⁇ ) is filled with fine particles (particle group ⁇ ) in the gaps between the coarse particles, so that the filling rate of the soft magnetic powder is improved, and excellent magnetic permeability and DC superposition characteristics are realized.
  • the area A occupied by the particle group ⁇ and the area B occupied by the particle group ⁇ in the cross section of the dust core can be calculated from the total area of the particles belonging to each particle group using, for example, a scanning electron microscope (SEM). .
  • SEM scanning electron microscope
  • the total of the area A occupied by the particle group ⁇ and the area B occupied by the particle group ⁇ in the cross section of the dust core is preferably 100% to 50% with respect to the total area of the soft magnetic powder. More preferably, it is in the range of 100% to 65%. That is, the dust core according to the present embodiment is substantially composed of the particle group ⁇ and the particle group ⁇ , and the area of the other soft magnetic powder (hereinafter sometimes referred to as “intermediate particle group ⁇ ”). The rate is preferably less than 50%, more preferably 35% or less.
  • the magnetic powder whose circularity and particle size are out of the range of the particle group ⁇ and the particle group ⁇ may be contained in a relatively small amount, and it is preferable that the magnetic powder is not substantially contained. Therefore, in the dust core of the present embodiment, the particle size distribution of the soft magnetic powder in the cross section is preferably bimodal. When the area ratio of the intermediate particle group ⁇ increases, the magnetic permeability may decrease even if the direct current superposition characteristics are relatively good.
  • the fine particles (particle group ⁇ ) are filled in the gaps between the coarse particles (particle group ⁇ ), and the soft magnetic powder
  • the filling rate is improved, and excellent magnetic permeability is realized.
  • the particles having a high aspect are not substantially contained, the direct current superposition characteristics are also improved.
  • the particle size (equivalent circle diameter) of the particle group ⁇ in the cross section of the dust core is preferably 10 ⁇ m or more and 50 ⁇ m or less, more preferably 15 to 40 ⁇ m, and the particle size of the particle group ⁇ . (Equivalent circle diameter) is preferably 0.5 ⁇ m or more and less than 10 ⁇ m, and more preferably 1 to 5 ⁇ m.
  • the particle size of the peak P ⁇ is preferably 15 to 40 ⁇ m, more preferably 20 to 30 ⁇ m, and the particle size of the peak P ⁇ is preferably 0. It is in the range of 8-8 ⁇ m, more preferably 1.2-4 ⁇ m.
  • the aspect ratio of the fine particles is preferably less than 4, more preferably 1 to 3. If the aspect ratio of the fine grains is too high, the direct current superimposition characteristics may deteriorate.
  • coarse particles (particle group ⁇ ) and fine particles (particle group ⁇ ) are soft magnetic powders, and Fe-based soft magnetic particles are preferable.
  • Fe-based magnetic particles include pure iron, Fe-based alloys, Fe-Si based alloys, Fe-Al based alloys, Fe-Ni based alloys, Fe-Si-Al based alloys, Fe-Co based alloys, Examples include Fe-Ni-Si-Co alloy, Fe-Si-Cr alloy, Fe amorphous alloy, Fe nanocrystal alloy, etc. Pure iron, Fe-Si alloy, Fe-Si-Cr alloy More preferably.
  • the Fe—Si—Cr alloy which is a preferred soft magnetic powder, has a composition represented by (100-mn) Fe—mSi—nCr, where m is 2 to 7 and n is in the range of 3 to 8. If it exists, a magnetic permeability and a saturation magnetic charge will become high, and it is preferable.
  • the soft magnetic powder may be composed of magnetic particles made of the same material, or may be composed of a mixture of magnetic particles of different materials.
  • the coarse particles (particle group ⁇ ) and the fine particles (particle group ⁇ ) may be the same material or may be different.
  • the method for producing the soft magnetic powder there are no particular limitations on the method for producing the soft magnetic powder, but various powdering methods such as an atomizing method (for example, a water atomizing method, a gas atomizing method, a high-speed rotating water atomizing method, etc.), a reduction method, a carbonyl method, a pulverizing method, etc. Manufactured by.
  • an atomizing method for example, a water atomizing method, a gas atomizing method, a high-speed rotating water atomizing method, etc.
  • a reduction method for example, a water atomizing method, a gas atomizing method, a high-speed rotating water atomizing method, etc.
  • a reduction method for example, a reduction method, a carbonyl method, a pulverizing method, etc.
  • the average circularity of the coarse particles used as the koji raw material may be 1 to 0.8.
  • the average particle diameter (equivalent circle diameter) of the coarse particles is preferably 10 ⁇ m or more and 50 ⁇ m or less. Further, the coarse particles preferably have a narrow particle size distribution.
  • the average circularity of the fine grains used as the koji raw material may be 0.8 to 0.4.
  • the average particle diameter of the fine particles is preferably 0.5 ⁇ m or more and less than 10 ⁇ m. Further, the fine particles preferably have a narrow particle size distribution. Moreover, it is preferable that the particle size distributions of the coarse particles and the fine particles do not substantially overlap.
  • the degree of circularity of the soft magnetic powder used as the raw material can be controlled within a desired range by selecting an appropriate manufacturing method as described above.
  • the atomizing method is a manufacturing method in which an alloy melted at a high temperature is dropped as a trickle, and a low-temperature fluid is sprayed onto the alloy to scatter and rapidly solidify the molten alloy into powder, depending on the spray conditions of the fluid.
  • the degree of circularity can be controlled by changing the degree of rapid solidification.
  • the particle size can be controlled within a predetermined range by means such as classification after the magnetic powder is produced.
  • the shape of coarse grains and fine grains used as a raw material for straw is almost maintained during mixing and molding. This means that in the finally obtained dust core, the average circularity of the particle group ⁇ and the raw material coarse particles is substantially the same, and the average circularity of the particle group ⁇ and the raw material fine particles is substantially the same, and It can also be confirmed from the fact that the area ratio (A / B) is substantially equal to the charging ratio of coarse grains and fine grains.
  • An insulating coating may be formed on the soft magnetic powder.
  • the constituent material of the insulating coating include magnesium phosphate, calcium phosphate, zinc phosphate, manganese phosphate, phosphate such as cadmium phosphate, silicate (water glass) such as sodium silicate, soda lime Inorganic coatings such as glass, borosilicate glass, lead glass, aluminosilicate glass, borate glass, and sulfate glass are preferably used. Since the inorganic coating is particularly excellent in insulation, the Joule loss due to the induced current can be particularly suppressed. Moreover, the insulation between magnetic powder can be improved especially by providing an insulating film.
  • the thickness of the insulating coating is preferably in the range of 5 to 160 nm, more preferably 30 to 100 nm, and particularly preferably 50 to 95 nm. If the thickness of the insulating coating is too thin, sufficient corrosion resistance cannot be obtained, and if it is too thick, the interval between the magnetic powders may be widened, and the permeability ⁇ as the dust core may be lowered. Moreover, the insulating film does not need to cover the whole surface of magnetic powder, and may cover only one part.
  • the resin constituting the dust core a known resin can be used. Specifically, various organic polymer resins, silicone resins, phenol resins, epoxy resins, water glass and the like are exemplified. There is no restriction
  • the content of the soft magnetic powder in the entire dust core is preferably 90% by mass to 98% by mass, and the content of the resin is preferably 2% by mass to 10% by mass.
  • a method for producing the dust core is not particularly limited, and a known method can be adopted. First, a soft magnetic powder and a resin binder are mixed to obtain a mixed powder. Moreover, it is good also considering the obtained mixed powder as granulated powder as needed. Then, the mixed powder or granulated powder is filled into a mold and compression molded to obtain a molded body having the shape of a magnetic body (a powder magnetic core) to be produced. By subjecting the obtained molded body to a heat treatment, a powder magnetic core having a predetermined shape to which metal magnetic powder is fixed is obtained. There are no particular limitations on the conditions for the thermosetting treatment, and for example, heat treatment is performed at 150 to 220 ° C. for 1 to 10 hours. Moreover, there is no restriction
  • the filling rate of soft magnetic powder in the dust core is preferably 70% or more, and more preferably 80% or more.
  • the upper limit is not particularly limited, but about 95% is a limit in industrial implementation.
  • a coil-type electronic component such as an inductor is obtained by winding a wire a predetermined number of times around the obtained dust core.
  • the above-mentioned mixed powder or granulated powder and an air-core coil formed by winding a wire a predetermined number of times are filled in a mold and compression molded to obtain a molded body in which the coil is embedded. Also good.
  • a powder magnetic core having a predetermined shape in which a coil is embedded is obtained. Since such a dust core has a coil embedded therein, it functions as a coil-type electronic component such as an inductor.
  • ⁇ Filling rate> As a method for measuring the filling rate, the theoretical density was calculated from the metal composition formula, the dimensional density measurement of the core or the density measurement by Archimedes method was performed, and the filling rate was calculated by the density of the core with respect to the theoretical density.
  • Example No.1-19 Manufacture of dust core
  • 70 parts by volume of coarse particles listed in Table 1 and 30 parts by volume of fine particles were prepared, and xylene was added so that the silicone resin would be 3% by mass with respect to 100% by mass of the total soft magnetic powder.
  • Diluted and added kneaded with a kneader and dried, the aggregate obtained was sized so as to be 355 ⁇ m or less to obtain granules.
  • This was filled in a toroidal mold having an outer diameter of 17.5 mm and an inner diameter of 11.0 mm, and pressed with a molding pressure of 2 t / cm 2 to obtain a molded body.
  • the core weight was 5 g.
  • the obtained molded body was heat-treated in a belt furnace at 750 ° C. for 30 minutes in a nitrogen atmosphere to obtain a dust core (sample No. 1).
  • the compacted powder magnetic core was fixed with cold embedding resin, the cross section was cut out, mirror-polished and observed with an SEM.
  • the equivalent circle diameter of the soft magnetic powder in the SEM image was calculated, and a particle size distribution diagram was obtained from the particle size and frequency.
  • the peak P ⁇ with the largest particle size was 33 ⁇ m, and the peak P ⁇ with the smallest particle size was 4 ⁇ m.
  • Particles contained in the region up to both skirts of the maximum peak were defined as a particle group ⁇ (coarse particles).
  • the particles contained in the region up to the bottom of both peaks were defined as a particle group ⁇ (fine particles).
  • the average circularity of the particle group ⁇ and the particle group ⁇ was determined.
  • the average circularity of the particle group ⁇ was 0.9, which coincided with the average circularity of the raw material coarse particles. Further, the average circularity of the particle group ⁇ was 0.8, which coincided with the average circularity of the raw material fine particles.
  • the obtained magnetic powder core was evaluated for DC superposition characteristics. The results are shown in Table 1.
  • dust cores were obtained in the same manner as Sample No. 1 except that the coarse particles and fine particles shown in Table 1 were used in an amount corresponding to the area ratio shown in Table 1 (Sample Nos. 2 to 19). ).
  • grains in a powder magnetic core is substantially equal to the preparation ratio of each particle
  • the average circularity and area ratio of the particles in the cross section of the dust core almost coincided with the charged material.
  • the obtained magnetic powder core was evaluated for DC superposition characteristics. The results are shown in Table 1. In the table, samples marked with “*” correspond to comparative examples.
  • the magnetic permeability and direct current superposition characteristics of the dust core are improved by using the soft magnetic powder (coarse particles) that is almost spherical and large in diameter, and the soft magnetic powder (fine particles) that is low in circularity and small in diameter.
  • the soft magnetic powder coarse particles
  • the soft magnetic powder fine particles
  • sample No.20-24 Manufacture of dust core
  • the particle group ⁇ belonging to the intermediate particle size range between the particle group ⁇ (coarse particle) and the particle group ⁇ (fine particle) is included, the influence of the intermediate particle group ⁇ It was investigated.
  • a dust core was obtained in the same manner as described above except that the coarse particles, fine particles, and intermediate particles shown in Table 2 were used in an amount corresponding to the area ratio shown in Table 2 (Sample No. 21-24). The results are shown in Table 2.
  • the particle group ⁇ belonging to a particle size range between the particle group ⁇ (coarse particle) and the particle group ⁇ (fine particle) is included, if the area C of the particle group ⁇ is 50% or less, the permeability, direct current It can be seen that the superposition characteristics are good (sample No. 21-23), but the magnetic permeability tends to decrease when it exceeds 50% (sample No. 24). Therefore, when using intermediate grains that do not belong to coarse grains and fine grains, it is preferable to use them in such an amount that the area ratio is 50% or less.
  • Example No.25-53 Manufacture of dust core
  • the average particle size of coarse particles and the average particle size of fine particles were variously changed, and the relationship between the particle size and DC superposition characteristics was examined.
  • a powder magnetic core was obtained in the same manner as above except that the coarse particles and fine particles shown in Table 3 were used in an amount corresponding to the area ratio shown in Table 3 (Sample No. 25-53). The results are shown in Table 3.
  • the particle size of the soot particle group ⁇ is 10 ⁇ m or more and 50 ⁇ m or less and the particle size of the particle group ⁇ is 0.5 ⁇ m or more and less than 10 ⁇ m, a dust core excellent in both magnetic permeability and DC superposition characteristics can be obtained.
  • the magnetic permeability or the direct current superimposition characteristic is slightly lowered when the particle size is out of these ranges. Therefore, it is preferable that the particle sizes of the coarse particles and the fine particles are in the above range.
  • Sample No.54-170 Manufacture of dust core
  • Table 4-1 and Table 4-2 Coarse grains and fine grains described in Table 4-1 and Table 4-2 were used in an amount corresponding to the area ratio described in the table.
  • the amount of soft magnetic powder was adjusted so that the magnetic permeability ⁇ 0 was about 30 to 34.
  • the final heat treatment was performed at 350 ° C. for 30 minutes. The results are shown in Table 4-1 and Table 4-2.

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Abstract

Le but de la présente invention est d'obtenir un noyau à poudre de fer conçu à partir d'une poudre magnétique douce et d'une résine, dans lequel on obtient des caractéristiques de perméabilité élevée et d'exceptionnelle superposition CC. Selon la présente invention, ce noyau à poudre de fer est caractérisé en ce que : une poudre magnétique douce et une résine sont incluses ; lorsque la section transversale du noyau à poudre de fer est polie et observée, la répartition des diamètres de grains de la poudre magnétique douce présente une pluralité de pics ; et lorsqu'un groupe de particules appartenant au pic ayant le plus grand diamètre de grain est désigné comme groupe de particules α et qu'un groupe de particules appartenant au pic ayant le plus petit diamètre de grain est désigné comme groupe de particules β, la circularité moyenne du groupe de particules α est de 1 à 0,8 et la circularité moyenne du groupe de particules β est de 0,8 à 0,4.
PCT/JP2018/003281 2017-03-27 2018-01-31 Noyau à poudre de fer WO2018179812A1 (fr)

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Cited By (10)

* Cited by examiner, † Cited by third party
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JP2020155671A (ja) * 2019-03-22 2020-09-24 日本特殊陶業株式会社 圧粉磁心
CN112687447A (zh) * 2019-10-18 2021-04-20 株式会社村田制作所 电感器及其制造方法
JP2021077863A (ja) * 2019-10-31 2021-05-20 Tdk株式会社 磁性体コアおよびコイル部品
US20210296031A1 (en) * 2020-03-23 2021-09-23 Tdk Corporation Magnetic core, magnetic component, and electronic device
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