WO2022033033A1 - Feuille de suppression de bruit d'ondes électromagnétiques et dispositif électronique haute fréquence - Google Patents

Feuille de suppression de bruit d'ondes électromagnétiques et dispositif électronique haute fréquence Download PDF

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WO2022033033A1
WO2022033033A1 PCT/CN2021/082042 CN2021082042W WO2022033033A1 WO 2022033033 A1 WO2022033033 A1 WO 2022033033A1 CN 2021082042 W CN2021082042 W CN 2021082042W WO 2022033033 A1 WO2022033033 A1 WO 2022033033A1
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noise suppression
electromagnetic wave
wave noise
suppression sheet
sheet according
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PCT/CN2021/082042
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English (en)
Chinese (zh)
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李绪亮
戚超勇
葛现金
满其奎
谭果果
李润伟
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宁波磁性材料应用技术创新中心有限公司
中国科学院宁波材料技术与工程研究所
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Priority to KR1020237008553A priority Critical patent/KR20230073189A/ko
Publication of WO2022033033A1 publication Critical patent/WO2022033033A1/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
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15325—Amorphous metallic alloys, e.g. glassy metals containing rare earths
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15341—Preparation processes therefor

Definitions

  • the invention belongs to the technical field of electromagnetic compatibility, and in particular relates to an electromagnetic wave noise suppression sheet and high-frequency electronic equipment.
  • a near-field noise suppression sheet that converts excess radiated electromagnetic waves (noise) into heat is usually attached to equipment or the like.
  • the thickness of the noise suppression sheet is 0.02 mm to 2 mm, so it can be used by directly pasting or pasting in the vicinity of an electronic component or electronic circuit that is a noise source, and is easy to process and has a high degree of freedom in shape. . Therefore, the noise suppression sheet can be adapted to the miniaturization and weight reduction of electronic equipment and communication equipment which are advancing, and is widely used as a noise countermeasure member of electronic equipment or communication equipment.
  • the most commonly used electromagnetic noise suppression materials mainly include coating type and composite type.
  • the coating type material is made by mixing electromagnetic wave absorber and resin binder to make a coating, and then coating it on the surface of the protective body; composite type material It is an enhanced electromagnetic noise suppression material prepared by mixing electromagnetic wave absorbers with organic adhesives or multi-layer fibers.
  • the magnetic anisotropy of the soft magnetic alloy powder with respect to the in-plane anisotropy of the noise suppression sheet can be improved by processing the flat shape, and by utilizing the magnetic anisotropy, the magnetic permeability can be controlled according to the frequency of the electromagnetic wave to be absorbed.
  • the distribution of part ⁇ ” improves the absorption and suppression of electromagnetic waves at high frequency and improves the power loss ratio of electromagnetic waves.
  • the magnetic materials used in the current large-scale noise suppression sheet are mainly Fe-Si-Al, carbonyl iron, ferrite and other series of materials, as described in the patent documents CN103609207B, CN104072117A, CN107836140B, but the high performance of these magnetic materials
  • the frequency magnetic permeability is low, and the thickness of the noise suppression sheet is often thick, which limits its use in the GHz frequency band.
  • Patent document CN107377960B improves the imaginary part ⁇ " of magnetic permeability at high frequency by adjusting the formulation of FeMn alloy and the aspect ratio of flake powder.
  • Patent document CN107481829A uses Fe-Si-Al particle powder to control the particle size and The aspect ratio improves the mutual decoupling of the noise suppression sheet.
  • the noise suppression sheet described in the above patent documents has excellent noise suppression performance in the frequency band of 10MHz-5GHz, but in the frequency band of 5GHz and above, ⁇ ' and ⁇ " are relatively low, and the power loss is also difficult to meet the requirements of electronic equipment and electronic equipment in the 5G communication era. Requirements for electromagnetic noise suppression of high-frequency communication equipment.
  • the present invention uses soft magnetic RE a M b X c powder in electromagnetic wave noise suppression sheet, and finds that it has excellent noise suppression effect in high frequency band, and the real part of permeability is u in the range of 3-10 GHz. '>3, imaginary part u">3, power loss ratio Ploss/Pin>90%, transmission attenuation rate Rtp>20dB.
  • an electromagnetic wave noise suppression sheet comprising soft magnetic alloy powder, characterized in that: the chemical composition molecular formula of the soft magnetic alloy powder is RE a M b X c , wherein a, b, c is the number of atoms, where 0.5 ⁇ a ⁇ 20, 1 ⁇ b ⁇ 50, 0 ⁇ c ⁇ 10;
  • RE is one or more of rare earth elements La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y;
  • M is one or more of Fe, Co, Ni, Mn, Cr, Ti, Cu, Zn, Al, Ga, Ag, Nb, Zr;
  • X is one or more of the elements N, B, Si, C, S, P, O.
  • RE is one or more of rare earth elements La, Ce, Pr, Nd, Sm, Dy, Ho, Yb, Y;
  • M is one or more of Fe, Co, Ni, Cr, Cu, Zn, and Al;
  • X is one or more of N, B, Si, and C.
  • the shape of the soft magnetic alloy powder is flat.
  • the thickness of the soft magnetic alloy powder is 10 nm-10 ⁇ m, the size of the flakes is 10-200 ⁇ m, and the aspect ratio is 5-500. More preferably, the thickness is 10 nm-2 ⁇ m, the size of the flakes is 10-100 ⁇ m, and the aspect ratio is 10-100.
  • the preparation method of the soft magnetic alloy powder comprises: preparing raw materials of corresponding purity according to the chemical composition and molecular formula of the soft magnetic alloy powder, mixing and then smelting, and pouring the molten alloy liquid to obtain an alloy ingot or an alloy flake, Then, it is crushed to obtain powder, and the particle size of the powder is preferably 1-100 ⁇ m; or, the molten alloy liquid is gas-atomized to obtain spherical powder, and the particle size of the powder is preferably 5-200 ⁇ m.
  • the flat soft magnetic alloy powder is obtained by subjecting the soft magnetic alloy powder to flake processing, and the flake processing includes at least one of bedroom sand milling, planetary ball milling, vertical stirring mill and other processes or It consists of a variety of methods.
  • the preferred mechanical methods such as bedroom sand mill and vertical stirring mill are grinding and shearing.
  • the flat soft magnetic alloy powder is subjected to passivation treatment to reduce the electrical conductivity of the soft magnetic alloy powder.
  • the passivation treatment includes chemical treatment and heat treatment under a specific atmosphere, wherein the purpose of the chemical treatment is to coat an insulating layer or a high resistance layer on the surface of the powder, such as SiO 2 , TiO 2 , Al 2 O 3 , ZnO 2
  • the thickness of the layer is preferably 1-100 nm;
  • the heat treatment is mainly for the heat treatment of the soft magnetic alloy powder containing interstitial atoms N and C, including nitriding or carburizing treatment.
  • the nitriding treatment method is heat treatment in high-pressure (>1MPa) high-purity nitrogen or ammonia gas.
  • Carburizing treatment is vacuum heat treatment in a furnace chamber containing graphite or carbon components.
  • the electromagnetic wave noise suppression sheet sequentially includes a resistance layer, a magnetic layer, a metal layer, and an insulating layer in the thickness direction; wherein the magnetic layer contains the soft magnetic alloy powder.
  • the resistance layer is a thin layer with high resistance, its surface resistance value is 10 4 -10 8 ⁇ / ⁇ , preferably 10 5 -10 8 ⁇ / ⁇ , and the average thickness is 10-200 ⁇ m.
  • the resistance layer is a mixed layer including ferrite and a binder.
  • Ferrites are mainly NiZn ferrites, Co 2 Z-type hexagonal ferrites, and the like.
  • the average particle size of the ferrite is 0.1-20 ⁇ m, and the mass fraction does not exceed 10%.
  • the magnetic layer is an absorption loss layer for electromagnetic waves.
  • the thickness of the magnetic layer is 0.05-2 mm, more preferably 0.1-1.0 mm.
  • the magnetic layer is a mixed layer including the soft magnetic alloy powder, a binder and an additive.
  • the additives include one or more of flame retardants, defoaming agents, plasticizers, and the like.
  • the content of the soft magnetic alloy powder is 50-98%
  • the content of the binder is 2-40%
  • the balance is additives.
  • the magnetic layer is obtained by mixing the soft magnetic alloy powder, the binder, and the additives, followed by casting and lamination, and the thickness is preferably 0.05-2 mm, more preferably 0.1-1.0 mm.
  • an electromagnetic field parallel to the plane of the magnetic layer is applied, preferably, the size of the electromagnetic field is 1-2T.
  • the adhesive includes, but is not limited to, rubber, resin, polyurethane, and the like.
  • the resin is selected from any resin-based materials such as epoxy resin, phenolic resin, cellulose resin, polyethylene resin, polyester resin, polyvinyl chloride resin, and polyacetal resin.
  • the rubber is selected from any rubber-based material such as silicone rubber, acrylic rubber, nitrile rubber, butyl rubber, polyvinyl alcohol resin, and chlorinated polyethylene resin.
  • the defoamer includes but is not limited to modified silicon polydimethylsiloxane, modified polyether silicon, special silicone-free defoamer composed of mineral oil, special polyether ester and dispersant, etc. .
  • the plasticizer includes, but is not limited to, dibutyl sebacate (DBS), di-n-butyl adipate (DBA), dibutyl phthalate (DBP), and the like.
  • the flame retardants include, but are not limited to, one or more of metal hydroxides, nitrogen-containing cyclic compounds, phosphorus compounds with amide bonds, and the like.
  • the metal hydroxides are Mg(OH) 2 and Al(OH) 3 , and the amide-bonded phosphorus compound contains at least ammonium polyphosphate and red phosphorus.
  • the metal layer mainly reflects the electromagnetic waves that are not completely lost and transmitted by the magnetic layer into the magnetic layer for further loss, and at the same time plays the role of heat conduction.
  • the metal layer structure is not limited, and may be a single-layer thin film structure or a multi-layer thin film structure composed of Fe, Ni, Al, Zn, Cu, Ag, and Ti.
  • the thickness of the metal layer is preferably 20 nm to 50 ⁇ m, more preferably 0.5 ⁇ m to 20 ⁇ m.
  • the preparation method of the metal layer is not limited, including any one of coating, magnetron sputtering, vacuum evaporation, and electrodeposition.
  • a metal layer is first prepared on a substrate.
  • the substrate material is not limited, including stainless steel, Al, Mg, Cu, etc., and then the metal layer is peeled off from the substrate and bonded to the magnetic layer or insulating layer; Metal layers are obtained directly on the magnetic or insulating layers using methods other than electrodeposition. According to the realization degree and stability of the process, magnetron sputtering and coating methods are preferred to prepare the metal layer.
  • the insulating layer is used to prevent interference from noise sources and conduction of surrounding electronic components.
  • the insulating layer is a resin with high resistivity and low dielectric constant.
  • the resins include, but are not limited to, polyimide, polyethylene terephthalate, liquid crystal polymers, and fluororesins.
  • one layer can be directly placed on the surface of the other layers by deposition and spraying, or it can be connected by bonding.
  • adhesives include cyanoacrylate adhesives, ethyl cellulose, acrylic resins, polyvinyl acetal resins, polyurethane, polyethylene glycol, epoxy resin adhesives and other well-known adhesives.
  • the magnetic permeability test under high-frequency electromagnetic wave is to use a vector network analyzer to make the test sample into a cylindrical ring with an outer diameter of 7.00mm and an inner diameter of 3.04mm, and use a coaxial double-ended wire fixture to test the frequency range of 0.1-18GH Internal electromagnetic parameters.
  • the power loss ratio and the transmission attenuation rate are calculated according to the IEC standard (IEC 62333-2), and a vector network analyzer is also used.
  • the measurement fixture is a microstrip line whose impedance is adjusted to 50 ⁇ . Cut the test sample to a length of 100mm and a width of 50mm, then evenly cover the microstrip line, connect the microstrip line to the vector network analyzer, measure the reflection parameter S11 and transmission parameter S21 of the microstrip line at 0.1-18GHz, and then according to The formula calculates P loss /P in and R tp .
  • a foamed polystyrene board with a thickness of 10mm and a foaming ratio of the same size as the sheet is 20-30 times. Overlapped with the test sample, a 300g load was placed thereon.
  • the four-probe method is used to detect the surface resistance, the size of the sample is larger than 50mm ⁇ 50mm, and the thickness is corrected for the measurement.
  • the flame retardant characterization method is as follows: vertically fix the test sample (length 125mm, width 13mm, record the thickness of the sample), place the burner at 10mm from the lower end of the sample, and remove the burner after maintaining for 10s. Ignite it again for 10s, remove the burning appliance and record the after-flame time t to check whether there is any inflammable material falling. The measurement of flame retardancy is classified according to the UL94 grade.
  • the present invention applies the RE a M b X c soft magnetic alloy powder to the electromagnetic noise suppression sheet, and obtains excellent noise suppression performance in the high frequency band of 3-10 GHz, and the real part and the imaginary part of the magnetic permeability are respectively More than 3, the power loss ratio Ploss/Pin>90%, the transmission attenuation rate Rtp>20dB, which solves the problem that the noise suppression sheet in the prior art has low ⁇ ' and ⁇ " in the frequency band above 5GHz, and the power loss is low Therefore, it is difficult to meet the electromagnetic noise suppression requirements of high-frequency electronic equipment such as the 5G communication era. It has a good application prospect in the electromagnetic noise suppression of electronic equipment, especially high-frequency electronic equipment (frequency in the GHz range).
  • FIG. 1 is a cross-sectional view of a high-frequency electromagnetic noise suppressing sheet in Examples 1-4 of the present invention.
  • FIG. 2 is a graph showing the variation of the real part of the magnetic permeability with frequency in Examples 1-4 of the present invention.
  • FIG. 3 is a graph showing the variation of the imaginary part of the magnetic permeability with frequency in Examples 1-4 of the present invention.
  • FIG. 4 is a graph showing the variation of the power loss ratio Ploss/Pin with frequency in Examples 1-4 of the present invention.
  • FIG. 5 is a curve showing the variation of the transmission attenuation rate Rtp with the frequency in Embodiments 1-4 of the present invention.
  • the reference numerals in FIG. 1 are: resistance layer 1 , magnetic layer 2 , soft magnetic alloy powder 3 , metal layer 4 , insulating layer 5 .
  • the composition of the selected soft magnetic material is Y 1.5 Nd 0.5 Co 8 Fe 5.5 Ni 3.0 Mn 0.5
  • the powder preparation method is as follows:
  • step 2) The alloy flakes obtained in step 1) are crushed to a particle size of 0.1-1 mm with a hammer crusher, and then the particle powder is further crushed to an average particle size of 15 ⁇ m using a jet mill.
  • step 2) The powder obtained in step 2) is further ground by ball milling process, the grinding medium is stainless steel balls of 3 mm and 5 mm, the mass ratio of the two is 3:1, the ratio of balls to material is 20:1, the grinding solvent is dehydrated alcohol, and the ball is milled. After 4 hours, a flat powder was obtained with an average size of 20 ⁇ m and an average thickness of 150 nm.
  • a SiO 2 film with an average thickness of 10 nm is formed on the flat powder obtained in step 3) by a sol-gel process.
  • the electromagnetic wave noise suppression sheet includes a resistance layer 1, a magnetic layer 2, a metal layer 4 and an insulating layer 5 in order in the thickness direction, wherein the magnetic layer 2 contains Y 1.5 Nd 0.5 obtained in the above step 4).
  • Co 8 Fe 5.5 Ni 3.0 Mn 0.5 soft magnetic alloy powder 3 the preparation method is as follows:
  • the Co 2 Z-type hexagonal ferrite with an average particle size of 500 nm was uniformly mixed into the epoxy resin, and the mass fraction of the ferrite was 5%. Then, the epoxy resin mixed with ferrite is coated on the upper surface of the magnetic layer, and cured at 80° C. for 12 hours to obtain a resistance layer. According to the method for testing surface resistance of the present invention, the surface resistance value is measured to be 7.6 ⁇ 10 6 ⁇ / ⁇ , the average thickness is 40 ⁇ m.
  • the above-mentioned magnetic layer adhered with the resistance layer was placed in a magnetron sputtering cavity, and a metal Zn layer with a thickness of 10 ⁇ m was sputtered on the lower surface of the magnetic layer.
  • a polyimide insulating layer with a thickness of 20 ⁇ m is bonded to the surface of the metal Zn layer, and finally a noise suppression sheet with a thickness of 0.44-0.48 mm is obtained.
  • the noise suppression sheet prepared above is prepared into a circular ring with an inner diameter of 3.04 mm and an outer diameter of 7.00 mm to test the magnetic permeability, and cut out a 100 mm ⁇ 50 mm sheet to test the power loss ratio and transmission attenuation rate.
  • the composition of the selected soft magnetic material is Y 0.85 Nd 0.65 Ho 0.2 Fe 10.8 Al 4.2 Cu 1.0 Si 2.0
  • the powder preparation method is as follows:
  • step 2) the powder obtained in step 1) is further processed with a vertical stirring mill, the grinding medium is stainless steel balls of 3mm and 5mm, the mass ratio of the two is 1:1, the ratio of ball to material is 20:1, and the grinding solvent is dehydrated alcohol, The ball milling time was 3h, and a flat powder was obtained with an average size of 40 ⁇ m and an average thickness of 200 nm.
  • step 3 Add the flat powder obtained in step 2) into the solution of cyclohexane, stir evenly to form a slurry, and apply ultrasonic dispersion at the same time, and then add 1.5% nano-Al 2 O 3 and nano-Al into the slurry.
  • the average particle size of 2 O 3 was 5 nm.
  • an Al 2 O 3 film with an average thickness of 10 nm was attached to the surface of the flake powder.
  • the electromagnetic wave noise suppression sheet includes a resistance layer 1, a magnetic layer 2, a metal layer 4 and an insulating layer 5 in order in the thickness direction, wherein the magnetic layer 2 contains Y 0.85 Nd 0.65 obtained in the above step 3).
  • Ho 0.2 Fe 10.8 Al 4.2 Cu 1.0 Si 2.0 soft magnetic alloy powder 3 the preparation method is as follows:
  • the NiZn ferrite with an average particle size of 500 nm is uniformly mixed into the polyurethane, and the mass fraction of NiZn ferrite is 6%. Then, the polyurethane sol mixed with ferrite is directly coated on the upper surface of the magnetic layer, and cured at 80° C. for 8 hours to obtain a resistance layer. According to the method for testing surface resistance of the present invention, the surface resistance value is measured to be 5.0 ⁇ 10 7 ⁇ / ⁇ , and the average thickness is 80 ⁇ m.
  • the above-mentioned magnetic layer adhered with the resistance layer was placed in a magnetron sputtering cavity, and a metal Ni layer with a thickness of 10 ⁇ m was sputtered on the lower surface of the magnetic layer.
  • a polyimide insulating layer with a thickness of 20 ⁇ m is bonded to the surface of the metal Ni layer, and finally a noise suppression sheet with a thickness of 0.6-0.62 mm is obtained.
  • the noise suppression sheet prepared above is prepared into a circular ring with an inner diameter of 3.04 mm and an outer diameter of 7.00 mm to test the magnetic permeability, and cut out a 100 mm ⁇ 50 mm sheet to test the power loss ratio and transmission attenuation rate.
  • the composition of the selected soft magnetic material is Ce 1.5 Y 0.3 La 0.2 Fe 15 Co 2 N 3.5
  • the preparation method of the powder is as follows:
  • step 2) The alloy flakes obtained in step 1) are crushed to a particle size of 0.1-2mm with a hammer crusher, then screened to 0.2-0.8mm with a cyclone, and finally a vibration ball mill is used to further crush the particle powder to an average particle size of 50 ⁇ m. .
  • step 2) The granular powder obtained in step 2) is further ground by using a bedroom sand mill, the grinding medium is 3mm zirconia balls, the ball-to-material ratio is 20:1, the grinding solvent is anhydrous ethanol, and the ball milling time is 4h to obtain flat powder , with an average size of 50 ⁇ m and an average thickness of 700 nm.
  • step 4) Put the flat powder obtained in step 3) into the vacuum heat treatment, first pump the vacuum to 10 -3 Pa, fill with Ar gas of 0.01MPa, then fill with high-purity nitrogen of 5MPa, and heat to 450 After being kept at °C for 2 hours, then rapidly cooled to room temperature to obtain Ce 1.5 Y 0.3 La 0.2 Fe 15 Co 2 N 3.5 flake powder.
  • the electromagnetic wave noise suppression sheet includes a resistance layer 1, a magnetic layer 2, a metal layer 4 and an insulating layer 5 in order in the thickness direction, wherein the magnetic layer 2 contains the Ce 1.5 Y 0.3 obtained in the above step 4).
  • La 0.2 Fe 15 Co 2 N 3.5 soft magnetic alloy powder 3 the preparation method is as follows:
  • the NiZn ferrite with an average particle size of 2 ⁇ m was uniformly mixed into the epoxy resin, and the mass fraction of the ferrite was 5%. Then, the epoxy resin was directly coated on the upper surface of the magnetic layer, and the resistance layer was obtained by curing at 80° C. for 12 hours. According to the method for testing the surface resistance of the present invention, the surface resistance value was measured to be 8 ⁇ 10 7 ⁇ / ⁇ , and the average value was 8 ⁇ 10 7 ⁇ / ⁇ . Thickness 35 ⁇ m.
  • a layer of Fe film with an average thickness of 10 ⁇ m is adhered to the lower surface of the magnetic layer with the resistance layer adhered, and the adhesive is a cyanoacrylate adhesive.
  • a fluororesin insulating layer with an average thickness of 40 ⁇ m was bonded to the surface of the Fe film, and finally a noise suppression sheet with a thickness of 0.27-0.30 mm was obtained.
  • the noise suppression sheet prepared above is prepared into a circular ring with an inner diameter of 3.04 mm and an outer diameter of 7.00 mm to test the magnetic permeability, and cut out a 100 mm ⁇ 50 mm sheet to test the power loss ratio and transmission attenuation rate.
  • the composition of the selected soft magnetic material is Sm 1.85 Ce 0.2 Fe 12 Ti 1.0 Ga 0.5 B 1.2
  • the powder preparation method is as follows:
  • step 2) The alloy flakes obtained in step 1) are crushed to a particle size of 0.1-1 mm with a hammer crusher, and then the particle powder is further crushed to an average particle size of 30 ⁇ m using an air flow mill.
  • step 2) further grinding the powder obtained in step 2) by using a bedroom sand mill, the grinding medium is a 4mm stainless steel ball, the ratio of the ball to the material is 20:1, the grinding solvent is anhydrous ethanol, and the ball milling time is 6h to obtain a flat powder, Its average size is 50 ⁇ m and its average thickness is 300 nm.
  • a SiO 2 film with an average thickness of 10 nm is formed on the flat powder obtained in step 3) by a sol-gel method.
  • the electromagnetic wave noise suppression sheet includes a resistance layer 1, a magnetic layer 2, a metal layer 4 and an insulating layer 5 in order in the thickness direction, wherein the magnetic layer 2 contains the Sm 1.85 Ce 0.2 obtained in the above step 4).
  • Fe 12 Ti 1.0 Ga 0.5 B 1.2 soft magnetic alloy powder 3 the preparation method is as follows:
  • Co 2 Z-type hexagonal ferrite with an average particle size of 3 ⁇ m was uniformly mixed into the butyl rubber, and the mass fraction of the ferrite was 4%. Then, the butyl rubber mixed with ferrite is directly coated on the upper surface of the magnetic layer, and cured at 120° C. for 10 hours to obtain a resistance layer. According to the method for testing surface resistance of the present invention, the surface resistance value is measured to be 4.5 ⁇ 10 6 ⁇ / ⁇ , and the average thickness is 50 ⁇ m.
  • a layer of Cu film with an average thickness of 20 ⁇ m was pasted on the lower surface of the magnetic layer with the resistance layer adhered, and the adhesive was a cyanoacrylate adhesive.
  • a polyethylene terephthalate insulating layer with an average thickness of 50 ⁇ m is bonded on the surface of the Cu film, and an acrylic resin adhesive is used for bonding, and finally a noise suppression sheet with a thickness of 0.9-0.94 mm is obtained.
  • the noise suppression sheet prepared above is prepared into a circular ring with an inner diameter of 3.04 mm and an outer diameter of 7.00 mm to test the magnetic permeability, and cut out a 100 mm ⁇ 50 mm sheet to test the power loss ratio and transmission attenuation rate.
  • Fig. 2 The change curve of the magnetic permeability real part of the noise suppression sheet prepared in the above-mentioned Examples 1-4 with frequency is shown in Fig. 2, which shows that the magnetic permeability real part u'>4.5 in the range of 3-7 GHz, and in the range of 7-7 GHz The real part of permeability u'>3 in the range of 10GHz.
  • the power loss ratio Ploss/Pin of the noise suppression sheets prepared in the above examples 1-4 is shown in Fig. 4 as a function of frequency, showing that the power loss ratio Ploss/Pin>90% in the range of 3-10 GHz.
  • the curve of the transmission attenuation rate Rtp of the noise suppression sheet prepared in the above examples 1-4 is shown in Figure 5, which shows that the transmission attenuation rate Rtp>20dB in the range of 3-10GHz, and the transmission attenuation rate in the range of 4-10GHz Attenuation rate Rtp>30dB.

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  • Engineering & Computer Science (AREA)
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Abstract

La présente invention concerne une feuille de suppression de bruit d'ondes électromagnétiques et un dispositif électronique haute fréquence. La feuille de suppression de bruit d'ondes électromagnétiques comprend une poudre d'alliage magnétique malléable REaMbXc, a, b et c étant le nombre d'atomes, 0,5<a<20, 1<b<50 et 0≤c<10. La feuille de suppression de bruit d'ondes électromagnétiques présente une excellente performance de suppression de bruit dans la bande haute fréquence de 3 à 10 GHz, le composant à perméabilité magnétique réelle et le composant à perméabilité magnétique imaginaire de la feuille de suppression de bruit d'ondes électromagnétiques sont séparément supérieurs à 3, un taux de perte de puissance Ploss/Pin est supérieur à 90 %, et un taux d'atténuation de transmission Rtp est supérieur à 20 dB. La feuille de suppression de bruit d'ondes électromagnétiques présente une bonne perspective d'application dans les dispositifs électroniques dans l'ère de la communication 5G, en particulier dans l'aspect de la suppression de bruit électromagnétique d'un dispositif électronique haute fréquence.
PCT/CN2021/082042 2020-08-12 2021-03-22 Feuille de suppression de bruit d'ondes électromagnétiques et dispositif électronique haute fréquence WO2022033033A1 (fr)

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