WO2002000954A1 - Poudre d'alliage magnetique douce destinee aux feuilles d'absorption d'ondes electromagnetiques, feuilles d'absorption d'ondes electromagnetiques et procede de fabrication de celles-ci - Google Patents

Poudre d'alliage magnetique douce destinee aux feuilles d'absorption d'ondes electromagnetiques, feuilles d'absorption d'ondes electromagnetiques et procede de fabrication de celles-ci Download PDF

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Publication number
WO2002000954A1
WO2002000954A1 PCT/JP2001/005610 JP0105610W WO0200954A1 WO 2002000954 A1 WO2002000954 A1 WO 2002000954A1 JP 0105610 W JP0105610 W JP 0105610W WO 0200954 A1 WO0200954 A1 WO 0200954A1
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Prior art keywords
alloy powder
electromagnetic wave
soft magnetic
magnetic alloy
mass
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PCT/JP2001/005610
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English (en)
Japanese (ja)
Inventor
Narihira Matsumoto
Kimiharu Ohta
Masutaro Hayase
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Sumitomo Special Metals Co., Ltd
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Publication of WO2002000954A1 publication Critical patent/WO2002000954A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0073—Shielding materials
    • H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
    • H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • 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
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets

Definitions

  • the present invention is an electromagnetic wave absorption sheet that can be easily attached to an electronic device such as a mobile phone, absorbs unnecessary electromagnetic waves that are generated by internal electronic components, and has high electromagnetic wave absorption performance especially in a high frequency band of 100 MHz or more.
  • the present invention relates to an iron-based soft magnetic alloy powder used therefor and a method for producing the same. Background art
  • Electromagnetic interference such as the application of electromagnetic waves, has become a problem.
  • the above-mentioned electromagnetic wave absorber needs to be thin and flexible enough to cope with a complicated shape in order to cope with the miniaturization, thinning and complexity of the device. Therefore, in general, a mixture of an organic binder such as rubber or resin and a soft magnetic material powder and molded into a sheet is used.
  • electromagnetic wave absorbers for example, a water atomized powder of Fe-Al-Si alloy (Sendust) is flattened by an attritor or the like, the flattened powder is mixed with a polyurethane resin, and then formed into a sheet (Japanese Patent Laid-Open No. No. 9-35927), or a sheet-like electromagnetic wave absorber obtained by flattening a water atomized powder having a composition of Fe 84 Cr 7 Al 9 with an attritor, kneading the powder and rubber, and forming a roll. Kaihei 11-87117) has been proposed.
  • the magnetic loss term (pr ) of the complex magnetic permeability in the high frequency band is small, so that in the high frequency band which satisfies recent requirements, Of the present invention could not be obtained.
  • the present invention solves the above-mentioned conventional problems, and has a sufficiently large magnetic loss term ( ⁇ ⁇ ”) even in a high frequency band, and in particular, a soft magnetic alloy powder for an electromagnetic wave absorbing sheet excellent in electromagnetic wave absorbing performance in a high frequency band of 100 MHz or more.
  • An object of the present invention is to provide an electromagnetic wave absorbing sheet and a method for producing the same.
  • the present inventors have conducted intensive studies to achieve the above object, and as a result, have found that the magnetic loss term (pr ”) can be significantly improved when a specific composition range is used in an Fe-Si alloy or an Fe-Ni alloy.
  • the inventors can develop excellent electromagnetic wave absorption characteristics in a high frequency band by optimizing conditions such as a particle size, a thickness, and an aspect ratio according to an alloy having the above composition range. It has been found that a flat soft magnetic alloy powder for an electromagnetic wave absorbing sheet can be obtained.
  • the inventors have added the flat alloy powder and an organic binder, kneaded them, and formed them into a sheet shape, thereby having a flexibility capable of coping with a thin and complicated shape, The inventors have found that an electromagnetic wave absorbing sheet having excellent electromagnetic wave absorbing performance in a band can be obtained, and have completed the present invention.
  • the thickness d is 0.01 ⁇ to 0.6 ⁇
  • the aspect ratio (the length and the thickness are
  • a soft magnetic alloy powder for an electromagnetic wave absorbing sheet characterized by a Fe-Si or Fe-Ni soft magnetic alloy having a flat shape of 10 to 500 and a saturation magnetization Is of 1.2 T or more.
  • the composition of the soft magnetic alloy according to the present invention is as follows: Fe-Si system: Si 3 mass% to 9 mass%, balance Fe and unavoidable impurities; Fe-Ni system: Ni 36 mass% to 49 mass%, balance Fe and unavoidable impurities It is characterized by consisting of.
  • the present invention provides a powder of a single composition of the Fe-Si-based alloy powder or Fe-Ni-based alloy powder having the above-mentioned composition, or an appropriate combination of the Fe-Si-based alloy powder and the Fe-Ni-based alloy powder.
  • An electromagnetic wave absorbing sheet characterized by appropriately containing a soft magnetic alloy powder for an electromagnetic wave absorbing sheet made of a mixed composite powder.
  • the present invention is the a Fe-Si-based or Fe-Ni based composition
  • a step of having an average particle diameter D 50 of preparing a soft magnetic alloy powder is 10 ⁇ ⁇ 40 ⁇
  • mechanical pressure E in the alloy powder Alms thickness d force 3 ⁇ 4.01 ⁇ !
  • a method for producing a soft magnetic alloy powder for an electromagnetic wave absorbing sheet comprising a step of forming a flat alloy powder having an aspect ratio (length ⁇ / thickness d) of 10 to 500 ⁇ m.
  • the alloy powder before mechanical processing is atomized powder and the mechanical processing is an atritor.
  • the present invention provides an alloy powder obtained by the above method, that is, the Fe-Si alloy powder or the Fe-Ni alloy powder, or the Fe-Si alloy powder and the Fe-Ni alloy powder in an appropriate ratio.
  • a method for producing an electromagnetic wave absorbing sheet comprising: a step of mixing an organic binder with the composite powder mixed in (1), and a step of processing the mixture into a sheet.
  • FIG. 1 is a graph showing the electromagnetic wave absorption performance (relationship between frequency MHz and complex relative magnetic permeability ⁇ ⁇ ') of the electromagnetic wave absorption sheet according to the present invention in Embodiment 2.
  • FIG. 2 is a graph showing the electromagnetic wave absorption performance (the relationship between the frequency MHz and the imaginary part ⁇ ⁇ ′′ of the complex magnetic permeability) of the electromagnetic wave absorption sheet according to the present invention in the second embodiment.
  • FIG. 3 is a graph showing the electromagnetic wave absorption performance (relationship between frequency MHz, complex relative magnetic permeability pr 'and its imaginary part iir ”) of the electromagnetic wave absorption sheet according to the present invention in Embodiment 4.
  • FIG. 4 is a graph showing the electromagnetic wave absorption performance (relationship between frequency MHz and complex relative magnetic permeability ⁇ ) of the electromagnetic wave absorption sheet according to the present invention in Embodiment 6.
  • FIG. 5 is a graph showing the electromagnetic wave absorption performance (the relationship between the frequency MHz and the imaginary part ⁇ ⁇ ′′ of the complex relative magnetic permeability) of the electromagnetic wave absorption sheet according to the present invention in the sixth embodiment.
  • FIG. 6 is a graph showing the electromagnetic wave absorption performance (relationship between frequency MHz and complex relative magnetic permeability ⁇ ⁇ ′ and its imaginary part ⁇ ′′) of the electromagnetic wave absorption sheet according to the present invention in Example 8.
  • FIG. 7 is a graph showing the electromagnetic wave absorbing performance (relationship between the frequency MHz and the complex relative magnetic permeability ⁇ ⁇ 'and its imaginary part pr ") of the electromagnetic wave absorbing sheet according to the present invention in the ninth embodiment. Best form for
  • the present invention is characterized by using a soft magnetic alloy powder for a Si-Fe-based and Ni-Fe-based electromagnetic wave absorbing sheet having a specific composition range specified below.
  • the present invention provides a soft magnetic alloy powder having excellent electromagnetic wave absorption performance in a high frequency band and a soft magnetic alloy powder by optimizing conditions such as a particle size, a thickness, and an aspect ratio according to the alloy in the composition range. An electromagnetic wave absorption sheet is obtained.
  • the saturation magnetic flux density Bs and the electrical resistance are large.However, if Si is less than 3 mass%, a different phase ( ⁇ phase) precipitates and the magnetic permeability ⁇ decreases, It is not preferable because the electric resistance value is small. Also, If Si exceeds 9% by mass, a different phase (Fe 3 Si phase) gradually starts to precipitate, and the magnetic permeability and the saturation magnetic flux density Bs are undesirably reduced. In the present invention, when Si is 3 to 9 mass%, only a uniform ⁇ solid solution (bcc phase) exists, a high saturation magnetic flux density Bs and an electric resistance value are obtained, and excellent high-frequency characteristics can be maintained. .
  • the crystal structure is changed to be unstable, and the saturation magnetic flux density Bs is undesirably reduced.
  • the coercive force He gradually increases and the magnetic permeability ⁇ decreases, which is not preferable.
  • a magnetic material is magnetized by an external alternating magnetic field, an eddy current flows in the limagnet according to the law of induction by the change in magnetic flux, and the eddy current is 0 at the center of the magnetic material and at the end. The largest. Also, the magnetic flux density of the magnetic material is highest at the end, so it is magnetized, but the center is not. The magnetic flux density of the magnetic material
  • the thickness is less than ⁇ ⁇ ⁇ , the alloy powder is oxidized, and the saturation magnetic flux density and the magnetic permeability are reduced, and 0.6 ⁇ is inevitably produced in the flat powder having a thickness of ⁇ . ⁇ ! Includes flat powder with a thickness of less than or greater than ⁇ . ⁇ , but there is no particular problem if it is contained to such an extent that the properties are not affected.
  • the aspect ratio (length / thickness d) of the soft magnetic alloy powder is less than 10
  • a large magnetic permeability cannot be obtained due to the demagnetizing field due to the shape of the alloy powder. I don't.
  • the aspect ratio exceeds 500, the sheet-like alloy powder is undesirably bent or broken. Therefore, the aspect ratio is preferably in the range of 10 to 500. In the present invention, the aspect ratio is limited to 10 to 500, but there are some cases in which the aspect ratio is inevitably not satisfied in production.
  • the soft magnetic alloy powder preferably has a saturation magnetization of 1.2 T or more in the state of the flat alloy powder. If the saturation magnetization is less than 1.2 T, the intended electromagnetic wave absorption performance cannot be obtained in the high frequency band.
  • the thickness d is ⁇ ⁇ . ⁇ !
  • the average particle diameter D 50 is more than 40Myupaiiota, together it is difficult to flatten the alloy powder by mechanical processing, is not preferred because it takes time to pressure E.
  • the soft magnetic alloy powder described above a known atomizing method, roll quenching method, ordinary melting, and melting method can be adopted.
  • Mechanical grinding (grinding) for flattening the soft magnetic alloy powder can use an attritor, a ball mill, a pin mill, a sand mill, a stamp mill, or the like.
  • an attritor is preferable because the alloy powder can be easily flattened in a short time.
  • the electromagnetic wave absorbing sheet is manufactured by adding an organic binder to a required soft magnetic alloy powder, mixing the mixture, and processing the mixture into a sheet.
  • the soft magnetic alloy powder is, for example, the Fe-Si-based alloy powder or Can be used as a single powder of Fe-N engaging gold powder or a composite powder obtained by mixing Fe-Si alloy powder and Fe-Ni alloy powder at an appropriate ratio.
  • the electromagnetic wave absorption sheet a structure in which a layer containing an Fe-Si alloy powder and a layer containing an Fe-Ni alloy powder are appropriately laminated can be adopted.
  • the organic binder to be added to the flat alloy powder chlorinated polyethylene resin, polyurethane resin, polyester resin, polyvinyl chloride resin, nitrile-butadiene rubber, styrene-butadiene rubber or the like can be used. It is preferable to use a plastic resin. Further, in addition to the organic binder, various plasticizers can be added in small amounts for improving the plasticity. It is preferable to select the optimum amount of addition according to the type of the organic binder and the shape and properties of the sheet.
  • a coupling agent such as a Ti-based, Si-based, A1-based, or Zr-based coupling agent should be added to improve compatibility (wetting property) between the flat alloy powder and the organic binder.
  • a coupling agent is preferable because it can improve the moldability and the corrosion resistance of the obtained radio wave absorption sheet.
  • the flat alloy powder and the organic binder are mixed and kneaded by a well-known mixer (kneader) such as a pressurized roller or a mixing roll.
  • a well-known mixer such as a pressurized roller or a mixing roll.
  • the powder mixed by the mixer is formed into a sheet by a molding machine such as an extrusion molding machine, a calendar roll, and a mixing roll.
  • the thickness of the sheet is appropriately selected according to the purpose, shape and characteristics of the sheet.
  • Table 1 shows the saturation magnetic flux density Bs, volume resistivity, and constituent phases of the alloy.
  • the saturation magnetic flux density decreases with an increase in the amount of Si, and conversely, the volume resistivity increases with an increase in the amount of Si.
  • Si content is less than 3.0 mass%, a hetero-phase ⁇ phase precipitates, and when the Si content exceeds 9.0 mass%, the Fe 3 Si phase starts to precipitate.
  • a spherical alloy powder was obtained.
  • Isopropyl alcohol was mixed with the alloy powder, and the mixture was subjected to attrition at a rotation speed of 200 rpm for 5 hours using an attritor. Then, the alloy powder was separated and dried to produce a flat alloy powder.
  • a chlorinated polyethylene resin and a small amount of a plasticizer are added as an organic binder so that the flat alloy powder has a viscosity of 60 vo3 ⁇ 4, and then mixed and molded with a mixing glass to produce an electromagnetic wave absorbing sheet. did.
  • FIGS. 1 and 2 show the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorption sheet at lMHz to 10 GHz.
  • FIG. 1 shows the real part pr 'of the complex relative permeability
  • FIG. 2 shows the imaginary part ⁇ ⁇ ′′ of the complex relative permeability on the vertical axis, and the horizontal axis shows the frequency.
  • the bold line a indicates the case of 6.0% Si-Fe of the present invention
  • the thin line c indicates the case of 9.0% Si-Fe of the present invention.
  • the electromagnetic wave absorption sheet was processed into a toroidal sample, and for 500 MHz or less, the sample was introduced into a test fixture that forms a one-turn coil, and the impedance was measured by an impedance analyzer (HP-4291A). It was determined by measuring. For 500 MHz or more, insert the sample into a coaxial tube, find the S-parameters with a network analyzer (HP-8720D), and use the Niclolson-Ross, Weir method to calculate the complex relative permeability ⁇ 1 and 2. As is clear from FIGS. 1 and 2, when the amount of Si is in the range of 3.0 to 9.0 mass%, the electromagnetic wave absorption characteristics particularly in the high frequency band of 100 MHz or more are improved. Comparative Example 1
  • the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorbing sheet at 1 MHz to 10 GHz were obtained in the same manner as in Example 2.
  • the results are shown in FIGS. 1 and 2.
  • the bold line d indicates the case of 1.5% Si-Fe of the comparative example
  • the thin line e indicates the case of 10.5% Si-Fe of the comparative example
  • the bold line f indicates the case of Fe-Si-AI of the comparative example.
  • the sheet of the comparative example shows a sharp decrease in electromagnetic wave absorption characteristics in the high frequency band, but the sheet of the present invention can maintain excellent electromagnetic wave absorption characteristics even in the high frequency band. I understand.
  • Example 2 Using the alloy made of Si 6 Fe 94 produced in Example 1, water atomization was performed to prepare spherical alloy powders having an average particle diameter D50 of 8 pm, 18 ⁇ , and 50 ⁇ . Each spherical alloy powder was formed into a sheet by the same process as in Example 2 to produce an electromagnetic wave absorbing sheet. Table 2 shows the electromagnetic wave absorption characteristics (imaginary part ⁇ ′ ′′ of the complex relative magnetic permeability) of the obtained electromagnetic wave absorbing sheet at 100 MHz, 500 MHz, and 1 GHz.
  • a flat Hitoshitsubu ⁇ D 50 performs water atomizing an alloy consisting of Si 6 Fe 94 prepared in Example 1 was prepared spherical alloy powder 18Myupaiiota.
  • the obtained alloy powder was not ground by an attritor, that is, formed into a sheet by the same process as in Example 2 while keeping the aspect ratio of the alloy powder to 1 (Comparative Example), and the same process as in Example 2.
  • was subjected to grinding treatment and flattened in the same manner as in Example 2 was formed into a sheet (Example). .
  • Figure 3 shows the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorption sheet at lMHz to 10GHz.
  • the thick line A is the complex relative permeability ⁇ : 'of the present invention
  • the middle thick line B is the complex relative permeability ⁇ ' of the comparative example
  • the thin line C is the imaginary part ⁇ ⁇ of the complex relative magnetic permeability of the present invention.
  • the extra fine line D indicates the imaginary part ⁇ ⁇ ”of the complex relative magnetic permeability of the comparative example. The measurement was performed in the same manner as in Example 2.
  • the electromagnetic wave absorbing sheet using the flat alloy powder having an aspect ratio of 100 is larger than the electromagnetic wave absorbing sheet using the spherical alloy powder having the aspect ratio of 1. It turns out that it is excellent in the electromagnetic wave absorption characteristic.
  • Table 3 shows the initial permeability, saturation magnetic flux density, coercive force, and volume resistivity of the alloy. As is evident from Table 3, the initial magnetic permeability is maximum when the Ni content is about 45 mass%. It can be seen that the saturation magnetic flux density increases with increasing Ni content, and conversely, the coercive force and volume resistivity decrease with increasing Ni content.
  • a spherical alloy powder was obtained. Isopropyl alcohol was mixed with the alloy powder, and the alloy powder was subjected to attrition at a rotation speed of 200 rpm for 5 hours using an attritor. Then, the alloy powder was separated and dried to produce a flat alloy powder.
  • a chlorinated polyethylene resin and a small amount of a plasticizer were added as an organic binder so that the flat alloy powder became 60 vo, and then mixed and molded by a mixing roll to produce an electromagnetic wave absorbing sheet.
  • FIGs. 4 and 5 show the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorbing sheet at lMHz to 10GHz.
  • FIG. 4 shows the real part ⁇ ⁇ ′ of the complex relative permeability
  • FIG. 5 shows the imaginary part iir ′′ of the complex relative permeability, respectively, and the horizontal axis shows the frequency.
  • the measurement is the same as in Example 2.
  • the electromagnetic wave absorption characteristics of the sheet in Comparative Example 1 are also shown for reference.
  • the bold line g indicates the case of 36% Ni-Fe of the present invention
  • the bold line h indicates the case of 42% Ni-Fe of the present invention (the thin line h in FIG. 5), and the 49% Si-Fe of the present invention.
  • thin line i shows the case of 36% Ni-Fe of the present invention
  • the bold line h indicates the case of 42% Ni-Fe of the present invention (the thin line h in FIG. 5)
  • the 49% Si-Fe of the present invention thin line i (however, thick line i in Fig. 5)
  • middle bold line j for 32% Ni-Fe in the comparative example
  • thin line k for 52% Ni-Fe in the comparative example
  • Fe-Si-Al the comparative example The case of is indicated by the bold line 1.
  • Example 5 Water atomization was performed using the alloy of Ni 42 Fe 58 produced in Example 5 to prepare spherical alloy powders having an average particle diameter D50 of 8 ⁇ , 17 ⁇ , and 50 ⁇ . Each spherical alloy powder was formed into a sheet by the same process as in Example 6 to produce an electromagnetic wave absorbing sheet.
  • Table 4 shows the electromagnetic wave absorption characteristics (imaginary part ⁇ ”of the complex relative magnetic permeability) of the obtained electromagnetic wave absorbing sheet at 100 MHz, 500 MHz, and 1 GHz.
  • the average particle size D 50 performs water atomization was prepared spherical alloy powder 18pm using an alloy consisting of Ni 42 Fe 58 prepared in Example 5.
  • the obtained alloy powder was not ground by an aerator, that is, the alloy powder was formed into a sheet by the same process as in Example 6 with the aspect ratio of the alloy powder being 1 (Comparative Example).
  • subjected to the grinding process in the same process as in Example 6 was formed into a sheet by the same process as in Example 6. (Example) were produced.
  • Figure 6 shows the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorption sheet at lMHz to 10GHz.
  • the thick solid line E is the complex relative magnetic permeability ⁇ ′ of the present invention
  • the medium thick line F is the complex relative magnetic permeability ⁇ ′ of the comparative example
  • the thin line G force is the imaginary part ⁇ of the complex relative magnetic permeability of the present invention
  • the ultrafine line ⁇ indicates the imaginary part ⁇ ⁇ ”of the complex relative magnetic permeability of the comparative example. The measurement was performed in the same manner as in Example 6.
  • An organic binder was added to and mixed with the flat alloy powder using the alloy composed of Si 6 Fe 94 produced in Example 2 and the alloy composed of Ni 42 Fe 58 produced in Example 6.
  • An organic binder was added to the flat alloy powder, and the mixture was mixed with each other so as to be 50 vol%, and then mixed and molded by a mixing roll to produce an electromagnetic wave absorbing sheet.
  • Fig. 7 shows the electromagnetic wave absorption characteristics of the obtained electromagnetic wave absorbing sheet from 1MHz to: LOGHz.
  • the solid line M indicates the real part iir ′ of the complex relative magnetic permeability
  • the solid line N indicates the imaginary part ⁇ ⁇ ′′ of the complex relative magnetic permeability.
  • the measurement was performed in the same manner as in Example 2.
  • the electromagnetic wave absorbing sheet containing the soft magnetic alloy powder in which the alloy composed of Si 6 Fe 94 and the alloy composed of Ni 42 Fe 58 are mixed is shown in FIG. 1 and FIG. as compared with the case of only the alloy consisting of 6 Fe 94, wave absorption characteristics of the until 1 ⁇ ⁇ 100 ⁇ is slightly lowered, it can be seen that the improved wave absorption property in the vicinity 100MHz ⁇ 400MHz.
  • the magnetic loss term ( ⁇ ⁇ ) is sufficiently large even in a high frequency band, and in particular,
  • the soft magnetic alloy powder and the organic binder are added, kneaded, and formed into a sheet to have a flexibility capable of coping with a thin and complex shape.
  • An electromagnetic wave absorption sheet excellent in electromagnetic wave absorption performance in a band can be provided.

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Abstract

La présente invention concerne une poudre d'alliage magnétique douce destinée aux feuilles d'absorption d'ondes électromagnétiques, qui possède un délais de perte magnétique suffisamment important (νξ'') même dans une bande haute fréquence, et qui présente des résultats excellents dans l'absorption des ondes électromagnétiques dans une bande haute fréquence supérieure à 100 MHz. Cette invention concerne aussi une feuille d'absorption d'ondes électromagnétiques et un procédé de fabrication de cette poudre et de cette feuille. Cette poudre d'alliage magnétique douce destinée à une feuille d'absorption d'ondes électromagnétiques qui possède un délai de perte magnétique (νξ'') considérablement amélioré dans une gamme de composition spécifique d'alliage Fe-Si ou d'alliage Fe-Ni, et pour laquelle les caractéristiques d'absorption des ondes électromagnétiques sont excellentes dans la bande haute fréquence, est obtenue par une optimisation des conditions, telles que le calibre des particules, le rapport d'épaisseur et d'aspect conforme à un alliage de la gamme de composition susmentionnée.
PCT/JP2001/005610 2000-06-29 2001-06-29 Poudre d'alliage magnetique douce destinee aux feuilles d'absorption d'ondes electromagnetiques, feuilles d'absorption d'ondes electromagnetiques et procede de fabrication de celles-ci WO2002000954A1 (fr)

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Cited By (3)

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JP2004165431A (ja) * 2002-11-13 2004-06-10 Sanyo Special Steel Co Ltd 電磁波吸収体用粉末
JP2015056618A (ja) * 2013-09-13 2015-03-23 株式会社リケン 近傍界用電波吸収シート
WO2019054085A1 (fr) * 2017-09-12 2019-03-21 株式会社リケン Feuille de suppression de bruit en champ proche

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