WO2023120730A1 - Matériau magnétique stratifié, noyau magnétique et procédé de production de matériau magnétique stratifié - Google Patents

Matériau magnétique stratifié, noyau magnétique et procédé de production de matériau magnétique stratifié Download PDF

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WO2023120730A1
WO2023120730A1 PCT/JP2022/047785 JP2022047785W WO2023120730A1 WO 2023120730 A1 WO2023120730 A1 WO 2023120730A1 JP 2022047785 W JP2022047785 W JP 2022047785W WO 2023120730 A1 WO2023120730 A1 WO 2023120730A1
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resin
magnetic material
laminated magnetic
laminated
quenched alloy
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PCT/JP2022/047785
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English (en)
Japanese (ja)
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石川湧己
野口伸
相牟田京平
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日立金属株式会社
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    • 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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/25—Magnetic cores made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets

Definitions

  • the present invention relates to a laminated magnetic material, a transformer core, and a method for manufacturing a laminated magnetic material.
  • Electromagnetic steel sheets have a thickness of about 0.20 to 0.35 mm, whereas amorphous alloys require ultra-quenching during their production, and are supplied in strips having a thickness of about 25 ⁇ m, for example.
  • the laminated magnetic material of the present invention is a laminated magnetic material in which the laminated quenched alloy ribbons are thermosetting or room temperature curable and are interlayer-bonded with a resin having a glass transition temperature of 100° C. or less.
  • the peel strength at room temperature is 1.0 gf/mm or more, and the magnetic flux density B80 of the entire laminated magnetic material is 1.25 T or more at an applied magnetic field of 80 A/m.
  • the quenched alloy ribbons bonded between layers with the resin have a magnetic flux density B80 of 1.4 T or more at an applied magnetic field of 80 A / m, and an iron loss Pcm of 0.26 W at a frequency of 50 Hz and a maximum magnetic flux density of 1.4 T. /kg or less.
  • the transformer core of the present invention preferably has the laminated magnetic material.
  • the laminated quenched alloy ribbons are thermosetting or room temperature curable, and the laminated magnetic material is laminated with a resin having a glass transition temperature of 100° C. or less.
  • a method for manufacturing a material comprising the steps of: applying the resin to one or both sides of the quenched alloy ribbon; and laminating the quenched alloy ribbon and curing the resin.
  • the resin is preferably at least one of epoxy resin, epoxy-modified silicone resin and acrylic resin.
  • an excellent laminated magnetic material for a transformer that has excellent heat resistance, is advantageous for ensuring reliability, maintains a high magnetic flux density, and has little iron loss.
  • FIG. 1 is a schematic perspective view showing an embodiment of the laminated magnetic material of the present invention
  • FIG. 1 is a schematic perspective view showing an embodiment of the laminated magnetic material of the present invention in which a resin layer 2 is arranged between two quenched alloy ribbons 1.
  • FIG. It is a schematic diagram of a test piece for a peel test.
  • 1 is a schematic diagram of a peel test measuring device
  • FIG. 1 is a schematic perspective view showing an embodiment of a transformer core of the invention
  • the present inventor clarified the relationship between the physical properties and adhesion conditions of the resin and the adhesive stress ⁇ determined by the various physical properties of the resin.
  • the present invention has been completed by discovering a laminated magnetic material for a transformer which maintains the magnetic properties of the transformer. A detailed description will be given below.
  • the present inventors made a detailed study of a magnetic material provided with a resin (adhesive) as disclosed in Patent Document 1.
  • the volume decreases when the resin (adhesive) hardens, and when it is heated and adhered, Since there is a difference in thermal expansion coefficient between the amorphous alloy ribbon and the adhesive, the resin (adhesive) applies adhesive stress mainly in the in-plane direction to the amorphous alloy ribbon.
  • the elastic modulus of the resin at room temperature is ⁇ [MPa]
  • ⁇ 1 [1/K] is the linear expansion coefficient of the resin at room temperature
  • Ta [K] is the curing temperature of the resin
  • ⁇ is the linear shrinkage rate of the resin when cured
  • h1 [ ⁇ m] is the resin thickness of the resin
  • amorphous When the thickness of the alloy ribbon is h2 [ ⁇ m], the linear expansion coefficient of the amorphous alloy ribbon is ⁇ 2 [1/K], and the room temperature is RT, the adhesive stress ⁇ [MPa] shown by the following formula is It is represented by a formula.
  • [] represents a unit.
  • RT at room temperature is assumed to be 296 [K].
  • the amorphous alloy ribbon Since the amorphous alloy ribbon has a large magnetostriction, the magnetic domain structure of the amorphous alloy ribbon is disturbed by the adhesive stress, and the magnetic properties of the amorphous alloy ribbon are changed.
  • amorphous alloy ribbons are laminated to form a laminated magnetic material, and a laminated core made of these laminated magnetic materials is used as a core for a power transformer in the commercial frequency band (50 Hz, 60 Hz), iron loss increases and a predetermined magnetic field A phenomenon occurs in which the magnetic flux density decreases when is applied.
  • An increase in the iron loss of the core leads to a decrease in efficiency of the transformer, and a decrease in magnetic flux density when a predetermined magnetic field is applied causes a problem of increased noise generated when the transformer is excited.
  • the iron loss P CM (hereinafter referred to as P CM14/50 ) is the iron loss [W/kg] at a frequency of 50 Hz and the maximum magnetic flux density of 1.4 T
  • the magnetic flux density B80 (hereinafter referred to as B80) is Represents the magnetic flux density [T] when magnetized with an applied magnetic field of 80 A/m. Based on this finding, the present inventor has conceived of a novel magnetic material.
  • the present invention provides a laminated magnetic material in which laminated quenched alloy ribbons are thermosetting or room temperature curable and are interlayer-bonded with a resin having a glass transition temperature of 100° C. or less,
  • the laminated magnetic material has a peel strength of 1.0 gf/mm or more at room temperature and a magnetic flux density B80 of 1.25 T or more at an applied magnetic field of 80 A/m for the entire laminated magnetic material.
  • the resins of the present invention should be thermosetting or cold setting.
  • Thermosetting or normal-temperature-setting resins are relatively low-molecular-weight liquid compounds before reaction. It is a resin that initiates a polymerization reaction when it is blocked and comes into contact with an active metal, and when it is polymerized into a polymer compound, it hardens and becomes a solid.
  • Thermosetting or normal-temperature-setting resins have higher heat resistance than hot-melt thermoplastic resins, and their adhesive strength is less likely to decrease even at high temperatures.
  • FIG. 1(a) is a schematic perspective view showing one embodiment of the laminated magnetic material.
  • a laminated magnetic material 11 of this embodiment includes a plurality of quenched alloy ribbons 1 and a resin layer 2 disposed between the plurality of quenched alloy ribbons 1 .
  • the form in a figure is shown typically, and does not necessarily correspond with an actual dimension.
  • FIG. 1(b) is a schematic perspective view showing one embodiment of the quenched alloy ribbon 1, which has two main surfaces 1a and 1b facing each other.
  • the laminated magnetic material 11 preferably has a B80 of 1.25 T or more.
  • the material of the quenched alloy ribbon 1, which constitutes the laminated magnetic material 11 of the present embodiment, is not particularly limited.
  • Fe-based amorphous alloy ribbon can be used.
  • "2605HB1M” is a registered trademark of Hitachi Metals, Ltd.
  • the composition is such that when the total amount of Fe, Si, and B is 100 atomic %, Si is 0 atomic % or more and 10 atomic % or less, and B is 10 atomic %. More than 20 atomic % or less is preferable.
  • the width of the quenched alloy ribbon 1 is not particularly limited, but can be, for example, 100 mm or more. If the width of the ribbon is 100 mm or more, a practical transformer can be favorably produced. More preferably, the width of the ribbon is 125 mm or more. On the other hand, the upper limit of the width of the ribbon is not particularly limited. brittleness, and the magnetic flux density B80 may decrease. More preferably, the width of the ribbon is 275 mm or less.
  • the thickness of the quenched alloy ribbon 1 is preferably 10 ⁇ m or more and 50 ⁇ m or less. If the thickness is less than 10 ⁇ m, the mechanical strength of the quenched alloy ribbon 1 tends to be insufficient. More preferably, the thickness is 15 ⁇ m or more, and more preferably 20 ⁇ m or more. On the other hand, when the thickness of the ribbon exceeds 50 ⁇ m, it tends to be difficult to stably obtain an amorphous phase. The thickness is more preferably 35 ⁇ m or less, and even more preferably 30 ⁇ m or less.
  • the quenched alloy ribbon 1 has no anisotropy derived from the crystal structure and does not have crystal grain boundaries that impede movement of domain walls, so it has excellent soft magnetic properties such as high magnetic permeability and low loss while maintaining high magnetic flux density. have. Further, the quenched alloy ribbon 1 alone preferably has a B80 of 1.48 T or more.
  • the quenched alloy ribbon 1 can be produced by various known methods. For example, by preparing a molten alloy having the composition described above and discharging the molten alloy onto the surface of the chill roll, a film of the molten alloy is formed on the surface of the chill roll, and the amorphous alloy ribbon 1 formed on the surface is It is obtained by peeling from the surface of the cooling roll by blowing a peeling gas and winding it into a roll shape with a take-up roll.
  • the quenched alloy ribbon 1 is effective as a transformer ribbon after heat treatment so that the direction of easy magnetization is in the longitudinal direction of the ribbon.
  • a method for obtaining such a quenched alloy ribbon in the case of heat treatment, for example, a method of heat treatment while being stretched (tension annealing), or a method of heat treatment while a magnetic field is applied in the longitudinal direction of the ribbon, A method of heat-treating the ribbon while applying a magnetic field in the longitudinal direction of the ribbon while being stretched is preferable.
  • the resin layer 2 is formed on the quenched alloy ribbon 1 subjected to such a heat treatment, and another quenched alloy ribbon 1 is joined to form the laminated magnetic material 11 .
  • FIG. 2 is a schematic perspective view showing a laminated magnetic material 12 in which a resin layer 2 is arranged between two quenched alloy ribbons 1. As shown in FIG.
  • the resin constituting the resin layer 2 has an elastic modulus of the resin at room temperature ⁇ [MPa], a linear expansion coefficient of the resin at room temperature ⁇ 1 [1/K], a curing temperature of the resin Ta [K], and the resin ⁇ is the linear shrinkage rate at the time of curing, h1 [ ⁇ m] is the resin thickness of the resin, h2 [ ⁇ m] is the thickness of the quenched alloy ribbon, and ⁇ 2 [1 / K] is the linear expansion coefficient of the quenched alloy ribbon.
  • room temperature is RT
  • the adhesive stress ⁇ [MPa] calculated by the above equation 1 is preferably 3 MPa or less, and is preferably formed using a thermosetting or room temperature curable resin.
  • the flexural modulus was measured by pouring resin into a strip-shaped mold and curing the resin.
  • the distance L between the fulcrums is 30 mm when the bending elastic modulus of the resin exceeds 700 MPa, 14 mm when the bending elastic modulus is 70 MPa or more and 700 MPa or less, and 8 mm when the bending elastic modulus is less than 70 MPa. do.
  • the test speed was set to 0.48 mm/min, and the load F [N] continuously applied to the sample until the bending strain ⁇ derived from Equation 2 below exceeded 0.0025, and the deflection D [mm] at that time were measured. do.
  • Bending stress ⁇ and bending strain ⁇ are calculated from the measured load and deflection using the following formulas (Equations 2 and 3) to obtain a stress-strain curve.
  • the stress curve in the bending strain section 0.0005 ⁇ 0.0025 of the stress-strain curve is linearly regressed by the method of least squares, and the slope thereof is defined as the bending elastic modulus [MPa].
  • the linear expansion coefficient ⁇ 1 [1/K] of the resin at room temperature is measured using a thermomechanical analyzer (TMA).
  • TMA thermomechanical analyzer
  • the linear shrinkage rate ⁇ of the cured resin is calculated using the following formula from the specific gravity of the uncured resin and the specific gravity of the cured resin.
  • the specific gravity of the uncured resin and the specific gravity of the cured resin are measured according to the JISK6833 specific gravity cup method and the JISK7122 water substitution method.
  • the uncured specific gravity in the case of a two-liquid mixing type adhesive is calculated by the following method. Assuming that two-liquid mixed adhesives are A agent and B agent, the respective specific gravities of A agent and B agent are measured using the JISK6833 specific gravity cup method. Based on the recommended mixing mass ratio of the two-liquid mixing type adhesive, the masses of the components A and B to be mixed are determined and calculated according to the following formula.
  • the adhesive stress ⁇ is preferably 3 MPa or less.
  • the reason for this is that the magnetic domain structure of the quenched alloy ribbon changes due to the adhesive stress acting on the quenched alloy ribbon from the resin, but if the adhesive stress is 3 MPa or less, the influence on the magnetic domain structure can be reduced. This is because it is possible to prevent deterioration of the magnetic properties of the quenched alloy ribbon.
  • the adhesive stress ⁇ of the resin is 3 MPa or less, the laminated magnetic material for a transformer has good magnetic properties such that the B80 of the entire laminated magnetic material is 1.25 T or more and the PCM14/50 is 0.26 W/kg or less. wood is obtained.
  • the adhesive stress ⁇ is more preferably 0.6 MPa or less.
  • the B80 of the entire laminated magnetic material is 1.39 T or more, and the PCM14/50 is 0.16 W/kg or less.
  • a laminated magnetic material for a transformer having magnetic properties is obtained.
  • thermosetting or normal-temperature-setting resins have higher heat resistance than hot-melt thermoplastic resins, and their adhesive strength is less likely to decrease at high temperatures.
  • Transformer cores inevitably rise in temperature during use, so hot-melt thermoplastic resins had concerns about their heat resistance and long-term reliability. For this reason, it is desirable to use a thermosetting or room-temperature-setting resin with excellent heat resistance.
  • the laminated magnetic material for transformers has a high space factor of 90% or more.
  • Hot-melt thermoplastic resins must be dissolved in an organic solvent for coating such thin films, and the use of organic solvents raises concerns about the effects on the human body and the environment.
  • thermosetting or normal-temperature-setting resin is a liquid compound with a relatively low molecular weight before curing, and therefore has a low viscosity and can be applied thinly without using a solvent such as an organic solvent. Therefore, there is little influence on the human body and the environment, and there is an advantage that the production process can be simplified.
  • thermosetting or room-temperature-setting resin used in this embodiment may be of any composition.
  • Typical thermosetting or room temperature setting resins include epoxy resins, acrylic resins, modified silicone resins, silicone resins, unsaturated polyester resins, vinyl ester resins, and the like.
  • the resin layer of the laminated magnetic material of the present invention is a resin composition containing at least one of these thermosetting or room temperature setting resins as a component.
  • Other components may include curing agents, and if necessary, other resins, curing accelerators, fillers, solvents, plasticizers, and the like.
  • the thermosetting or normal temperature setting resin is preferably at least one of epoxy resin, epoxy-modified silicone resin and acrylic resin.
  • Epoxy resins are the most widely used thermosetting resins or room temperature curing resins, and are particularly preferable because they come in many types and are highly practical, including from an economic standpoint.
  • the epoxy resin used in this embodiment is not particularly limited, but known monofunctional epoxy resins, polyfunctional epoxy resins, and the like can be used. Examples thereof include modified epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, aliphatic type epoxy resin, glycidylamine type epoxy resin, urethane modified epoxy resin, and rubber modified epoxy resin. These epoxy resins may be used alone or in combination of two or more.
  • the content of the epoxy resin in the resin layer is preferably at least 10% by mass or more, preferably 20% by mass or more, and more preferably 30% by mass or more, in order to develop high adhesive strength peculiar to epoxy resins.
  • the content is too large, the elastic modulus increases and the adhesive stress applied to the soft magnetic amorphous alloy ribbon 1 increases.
  • thermosetting resins or room temperature curing resins there are many types of acrylic resins, and in addition to being thermosetting resins or room temperature curing resins that are highly practical from an economic standpoint, the curing speed is fast, so the bonding process can be shortened.
  • the curing types even if the two liquids are not thoroughly mixed, the reaction can start and cure when the two liquids come into contact (honeymoon adhesion). Since there are many types of room-temperature curing methods such as adhesion and photocurable adhesion, it is preferable because the adhesion process can be easily optimized.
  • the acrylic resin used in the present invention is thermosetting or room temperature setting. Room temperature curing acrylic resins include second generation acrylic resins (SGA).
  • SGA is a resin that is hardened by graft polymerization of an elastomer and an acrylic monomer. Although it is thermoplastic, it has high heat resistance and does not easily lose adhesive strength at high temperatures.
  • acrylic resin components include polyacrylic acid and its copolymer, polyacrylic acid ester and its copolymer, polymethacrylic acid and its copolymer, polymethacrylic acid ester and its copolymer, urethane-acrylic Examples include acid copolymers, styrene-acrylic acid copolymers, and the like. These acrylic resins may be used alone or in combination of two or more.
  • the content of the acrylic resin in the resin layer is preferably at least 10% by mass or more, preferably 20% by mass or more, and more preferably 30% by mass or more, in order to develop high adhesive strength peculiar to acrylic resins.
  • Epoxy-modified silicone resin is preferable because it has an extremely low elastic modulus and can greatly reduce adhesive stress.
  • the type of epoxy-modified silicone resin can be either one in which some of the functional groups of the modified silicone resin are substituted with epoxy groups, or one in which the epoxy resin and the modified silicone are incompatible and phase-separated to form a sea-island structure. good.
  • the content of the epoxy-modified silicone resin in the epoxy-modified silicone resin composition is preferably at least 10% by mass or more.
  • the thickness of the resin layer 2 is preferably 5 ⁇ m or less, more preferably 3.0 ⁇ m or less, and even more preferably 2.0 ⁇ m or less. On the other hand, if the resin layer 2 is too thin, sufficient adhesive strength cannot be exhibited, so the thickness is preferably 1 ⁇ m or more, more preferably 1.5 ⁇ m or more.
  • Space factor calculation method The space factor is calculated by the following formula. Here, when displaying the space factor in percentage (%), the following formula is multiplied by 100.
  • the resin layer 2 is preferably adhered to at least one of the main surfaces 1a and 1b of the quenched alloy ribbon 1 so as not to be easily peeled off.
  • the resin layers 2 may be arranged on the two main surfaces 1a and 1b of the quenched alloy ribbon 1, respectively.
  • the resin layer 2 may be arranged on the entire main surfaces 1a, 1b, or may be arranged on the main surfaces 1a, 1b in stripes, dots, or the like, where the resin layer 2 is arranged, and the resin layer 2 is arranged. It may be provided in a predetermined pattern including a region that does not
  • FIG. 3 shows a schematic diagram of the laminated magnetic material 12 (laminated magnetic material for peel strength evaluation) used for the peel strength test.
  • the laminated magnetic material 12 is a laminated magnetic material in which a portion of one surface of the quenched alloy ribbon 1a and a portion of one surface of the quenched alloy ribbon 1b are adhered together.
  • the laminated magnetic material is a laminated magnetic material that is not bonded (bonded) at one end in the longitudinal direction.
  • the width of the laminated magnetic material is 25 mm, and the length of the bonded portion is 100 mm.
  • the peel strength of the laminated magnetic material is the force required to separate the laminated quenched alloy ribbons 1a and 1b, that is, the peel strength or holding force.
  • Methods for measuring peel strength include, for example, the 90° or 180° peel test method (K6854: 1999).
  • the peel strength can be measured using a peel strength measuring device 3 as shown in FIG. First, the other surface (the surface not coated with the resin) of the quenched alloy ribbon constituting the laminated magnetic material 12, for example, the other surface of the quenched alloy ribbon 1a, is attached to the metal base 3d with a double-faced tape 3e. fixed.
  • one end of the laminated magnetic material 12 that is not attached is gripped by a clip 3a, and the clip 3a is pulled at a constant speed by a force gauge 3b fixed via a linear guide 3c, and the load at that time is measured.
  • the peel strength of the laminated magnetic material can be measured.
  • the pulling speed was set to 90 mm/min.
  • load measurement is performed over a peel length of at least 40 mm excluding the first 25 mm, and the maximum load is taken as the peel strength [gf/mm] of the laminated magnetic material.
  • the laminated quenched alloy ribbons are thermosetting or room temperature curable, and are laminated with a resin having a glass transition temperature of 100° C. or less.
  • a method for manufacturing a magnetic material comprising the steps of: applying the resin to one or both sides of the quenched alloy ribbon; and laminating the quenched alloy ribbon and curing the resin.
  • the resin in the manufacturing method of the laminated magnetic material of the present embodiment that is, the thermosetting or normal temperature setting resin is the resin described above.
  • the step of applying a resin is a step of placing a resin on one side or both sides of the quenched alloy ribbon 1 to form the resin layer 2 .
  • the method for forming the resin layer 2 is not particularly limited. After that, there is a method of evaporating the solvent.
  • the method of forming the resin layer 2 by applying a resin using a flexographic printing method is often used when applying a thermosetting resin that does not contain a solvent.
  • step of curing the resin after the step of applying the resin, another quenched alloy ribbon 1 is superimposed on the surface of the quenched alloy ribbon 1 coated with the resin, pressed with a roller or the like, and heated to the curing temperature of the resin. It is a process of heating and hardening.
  • FIG. 5 is a perspective view showing one embodiment of a transformer core, which is an embodiment of the present invention.
  • Four laminated magnetic materials 11 are used to form a rectangular transformer core as a whole.
  • the shape of the transformer core is not limited to this embodiment.
  • a soft magnetic amorphous alloy ribbon made of 2605HB1M manufactured by Hitachi Metals, Ltd. and having a length of 120 mm, a width of 25 mm, and a thickness of 25 ⁇ m was prepared.
  • a tension of 40 MPa was applied in the longitudinal direction of the ribbon, and tension annealing was performed at 450° C. to impart induced magnetic anisotropy in which the direction is the direction of easy magnetization.
  • the coefficient of linear expansion of 2605HB1M is 4.3 ⁇ 10 ⁇ 6 [1/K].
  • PCM14/50 and B80 which are the magnetic properties of the soft magnetic amorphous alloy ribbon, are 0.114 W/kg and 1.55 T, respectively.
  • Examples and comparative examples of laminated magnetic materials were produced by bonding two soft magnetic amorphous alloy ribbons described above using resins having various adhesive stresses, and PCM14/50 and magnetic flux density B80 were measured for each. .
  • resins a1, b1, c1, d1, e1, f1, g1, h1, i1 and j1 were prepared.
  • Resins a1, b1, c1, d1 and e1 were used in Examples, and resins f1, g1, h1 and i1 were used in Comparative Examples.
  • the curing temperature, curing type, durometer hardness, resin layer thickness, elastic modulus, linear expansion coefficient, thermal contraction coefficient, linear contraction coefficient during curing, and adhesive stress of each resin are as shown in Table 1.
  • the modulus of elasticity, the coefficient of linear expansion, and the coefficient of linear shrinkage during curing are based on the results measured by the above-described measurement methods.
  • the curing type there are a one-liquid type that contains a curing agent in advance and cures by heating, and a two-liquid type that cures by mixing a curing agent and a main agent at the time of use.
  • Durometer hardness is measured by using a durometer hardness tester (rubber hardness tester) to press a type D (A) indentation against the surface of the test piece with a specified spring force. It is the hardness obtained from the depth, and refers to the value measured by the test method specified in JIS K7215.
  • the adhesive stress ⁇ [MPa] uses the elastic modulus, linear expansion coefficient, linear shrinkage coefficient at the time of curing, and curing temperature of each resin shown in Table 1, and the linear expansion coefficient of the amorphous alloy ribbon is 4.3 ⁇ 10 ⁇ 6 [1/K], and the room temperature is 300 [K], and the value is calculated from the above formula (Equation 1).
  • the thickness of the resin layer 2 after curing is between 1.9 ⁇ m and 4.9 ⁇ m in Examples 1 to 5, and between 2.9 ⁇ m and 6 in Comparative Examples 1 to 4. .7 ⁇ m.
  • PCM14/50 and magnetic flux density B80 were measured for the prepared samples. Each magnetic property was measured in consideration of the cross-sectional area and mass of only the portion of the soft magnetic amorphous alloy ribbon bonded between the layers with the resin among the laminated magnetic materials.
  • PCM14/50 each sample was excited at a frequency of 50 Hz and a maximum magnetic flux density of 1.4 T, and iron loss (W/kg) at that time was measured.
  • B80 a magnetic field with a frequency of 50 Hz and 80 A/m was applied, and the magnetic flux density B80 was measured.
  • the B80 of the entire laminated magnetic material is obtained by multiplying the magnetic flux density B80 measured in consideration of the cross-sectional area of only the portion of the soft magnetic amorphous alloy ribbon that is interlayer-bonded with resin by the space factor of the laminated magnetic material. calculated as
  • a BH loop analyzer SY8218 manufactured by Iwasaki Tsushinki Co., Ltd. was used as an AC magnetic characteristic measuring device, and an amplifier SY-5001 manufactured by PMK was used.
  • a frame for measurement was manufactured and used with reference to JISC2556 "Method for measuring magnetic properties of an electromagnetic steel strip using a single plate tester".
  • the jig construction consists of a MnZn ferrite yoke, a resin bobbin and polyurethane-coated copper wire.
  • a primary winding (exciting coil) (wire diameter: 0.5 mm) and a secondary winding (B coil) (wire diameter: 0.5 mm) were applied to a resin bobbin with 57 and 100 turns of polyurethane-coated copper wire, respectively.
  • a ribbon was inserted and a magnetic field was applied to the ribbon with a bobbin length of 36.2 mm.
  • the ribbon was sandwiched between upper and lower MnZn ferrite yokes. By sandwiching the ribbon between the MnZn ferrite yokes, the flow of the magnetic flux is made into a closed magnetic path, and the generation of the demagnetizing field in the ribbon can be prevented.
  • the background caused by the MnZn ferrite yoke and the air gap between the coil and the magnetic material was measured by connecting a compensating coil between the jig and the SY8218 and applying a magnetic field of 8000 A/m. The number of turns of the compensating coil was adjusted so that the output of was zero. Table 2 shows the measurement results of each sample.
  • the B80 of the soft magnetic amorphous alloy ribbon portion bonded between layers with resin is 1.4 T or more, and the PCM14/50 is 0. 0.26 W/kg or less, and had good magnetic properties for use in commercial frequency band transformers.
  • the B80 of the portion of the soft magnetic amorphous alloy ribbon bonded between the layers with the resin is 1.5 T or more, and the B80 of the entire laminated magnetic material is 1.4 T or more, and the P CM14/50 of 0.16 W/kg or less, which indicates a B80 of 90% or more versus the unbonded Comparative Example 5, and an increase in PCM14/50 of 17% or less, which is very good. It shows magnetic properties.
  • the linear shrinkage rate of the cured resin is preferably 0.8% or less.
  • the heat shrinkage rate ⁇ of the resin is preferably 0.3% or less.
  • Table 3 shows the peel strength evaluation results of the samples of Examples 1 to 5 and Comparative Examples 1 to 4 using the peel strength measurement method described above.
  • Comparative Example 6 a two-layer laminate was produced using polyester resin j1, which is a hot-melt thermoplastic resin, and its peel strength was also evaluated.
  • the peel strength at a high temperature of 70° C. was measured for Examples 1 to 5 and Comparative Example 6.
  • Examples 1 to 5 and Comparative Example 6 exhibit sufficient peel strength of 1.0 gf/mm or more at room temperature.
  • Examples 1 to 5 maintained a peel strength of 1.0 gf / mm or more, and the peel strength change rate (vs.
  • thermosetting or normal-temperature-setting resins such as those of Examples 1 to 5 are adhesives with excellent heat resistance, in which the peel strength is less likely to decrease even at high temperatures.
  • the present embodiment it is possible to provide an excellent laminated magnetic material, a core for a transformer, and a method for manufacturing the laminated magnetic material, which are excellent in heat resistance, maintain a high magnetic flux density, and have little iron loss.

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  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

La présente invention concerne : un matériau magnétique stratifié qui présente d'excellentes propriétés en termes de prévention d'une réduction de la résistance à la chaleur et de l'induction magnétique, ainsi que de suppression d'une augmentation de la perte de fer ; et un procédé de production d'un matériau magnétique stratifié.　L'invention concerne un matériau magnétique stratifié dans lequel des rubans minces d'alliage trempé stratifiés sont collés en couches à l'aide d'une résine qui est thermodurcissable ou durcissable à température ambiante et qui présente une température de transition vitreuse inférieure ou égale à 100 °C, ledit matériau magnétique stratifié étant caractérisé en ce que la résistance au pelage du matériau magnétique stratifié à température ambiante n'est pas inférieure à 1,0 gf/mm, et en ce que l'induction magnétique B80 de la totalité du matériau magnétique stratifié exposé à un champ magnétique appliqué de 80 A/m n'est pas inférieure à 1,25 T.
PCT/JP2022/047785 2021-12-24 2022-12-23 Matériau magnétique stratifié, noyau magnétique et procédé de production de matériau magnétique stratifié WO2023120730A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000336487A (ja) * 1999-05-28 2000-12-05 Nkk Corp 剪断強度及び剥離強度に優れた接着鉄芯用電磁鋼板の製造方法
JP2005109209A (ja) * 2003-09-30 2005-04-21 Mitsui Chemicals Inc 磁性基材、磁性積層体およびその製造方法
JP2009194724A (ja) * 2008-02-15 2009-08-27 Hitachi Metals Ltd 積層体、及びアンテナ
WO2019087932A1 (fr) * 2017-10-31 2019-05-09 日立金属株式会社 Matériau magnétique, matériau magnétique stratifié, paquet stratifié, et noyau stratifié utilisant un matériau magnétique, et procédé de production de matériau magnétique
JP2021154732A (ja) * 2020-03-25 2021-10-07 日立金属株式会社 軟磁性合金薄帯の積層体の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000336487A (ja) * 1999-05-28 2000-12-05 Nkk Corp 剪断強度及び剥離強度に優れた接着鉄芯用電磁鋼板の製造方法
JP2005109209A (ja) * 2003-09-30 2005-04-21 Mitsui Chemicals Inc 磁性基材、磁性積層体およびその製造方法
JP2009194724A (ja) * 2008-02-15 2009-08-27 Hitachi Metals Ltd 積層体、及びアンテナ
WO2019087932A1 (fr) * 2017-10-31 2019-05-09 日立金属株式会社 Matériau magnétique, matériau magnétique stratifié, paquet stratifié, et noyau stratifié utilisant un matériau magnétique, et procédé de production de matériau magnétique
JP2021154732A (ja) * 2020-03-25 2021-10-07 日立金属株式会社 軟磁性合金薄帯の積層体の製造方法

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