WO2017061447A1 - 圧粉磁心材料、圧粉磁心、およびその製造方法 - Google Patents
圧粉磁心材料、圧粉磁心、およびその製造方法 Download PDFInfo
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- WO2017061447A1 WO2017061447A1 PCT/JP2016/079571 JP2016079571W WO2017061447A1 WO 2017061447 A1 WO2017061447 A1 WO 2017061447A1 JP 2016079571 W JP2016079571 W JP 2016079571W WO 2017061447 A1 WO2017061447 A1 WO 2017061447A1
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- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
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- H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
Definitions
- the present invention relates to a dust core material, a dust core using this material, and a method of manufacturing the same.
- a dust core is an electromagnetic component obtained by compression molding soft magnetic powder whose surface has been subjected to insulation processing. From the viewpoint of resource saving and energy saving, this electromagnetic component is required to reduce the size and increase the efficiency of the magnetic core. In order to satisfy these requirements, a dust core with high magnetic flux density, high permeability, and low core loss is required. Needs to be further improved.
- Patent Document 1 As a conventional magnetic material, a magnetic material (Patent Document 1) in which the surface of a powder containing iron as a main component is covered with a film containing a silicone resin and a pigment, a grain boundary layer of Fe-based soft magnetic metal particles A magnetic material is known which is a high strength, high specific resistance, low loss composite soft magnetic material (Patent Document 2) mainly composed of a composite oxide of Fe, a divalent metal and Mg.
- a binding resin comprising an amorphous soft magnetic alloy powder, a glass powder having a softening point lower than the crystallization temperature of the amorphous soft magnetic alloy powder, a polyvinyl aqueous solution or a polyvinyl butyral solution
- a powder magnetic core obtained by mixing and pressing these mixtures to form a compact, and annealing the compact at a temperature lower than the crystallization temperature of the amorphous soft magnetic alloy powder.
- a powder magnetic core having a low melting point glass layer on the surface of an insulating film surrounding magnetic particles, and at least a part of the insulating film being liquid-phased by annealing and then solidified (Patent Document 4), soft magnetic particles A low temperature softening material comprising a first inorganic oxide having a softening point lower than the annealing temperature of soft magnetic particles, and a second inorganic oxide having a softening point higher than the annealing temperature. And high-temperature softeners The mixed powder core (Patent Document 5), the magnetic substance powder, and the glass powder whose transition point is lower than the crystallization temperature of the magnetic substance powder are mixed, and the transition point of the glass powder is 50% of the crystallization temperature of the magnetic substance powder.
- Patent Document 6 There is known a dust core (Patent Document 6) or the like which has a difference of at least ° C. and a crystallization temperature of the glass powder has a difference of 50 ° C. or less from the crystallization temperature of the magnetic substance powder.
- Patent Document 1 when a silicone resin or the like is used as the coating material of the magnetic material, since it often contains an organic solvent or a harmful substance as a solvent, attention must be paid to safety and environmental measures.
- Patent Document 2 adds Mg powder to oxidation treatment soft-magnetic powder, and heats the mixed powder obtained by mixing with a granulation rolling stirring mixing apparatus in inert gas atmosphere or a vacuum atmosphere etc. After that, it is a magnetic material to be subjected to an oxidation treatment which is heated in an oxidizing atmosphere if necessary.
- safety must be taken into consideration, such as using Mg powder.
- the powder magnetic core described in Patent Document 3 is safe because the surface of the amorphous soft magnetic alloy powder is coated with a silane coupling agent which is a heat resistant protective film, and a polyvinyl butyral solution may be used. There is a problem that you have to pay attention to sex. Although the powder magnetic cores described in Patent Documents 4 to 6 use a low melting point glass layer or a glass powder, none of them is considered to previously bind soft magnetic powders to each other.
- Soft magnetic materials such as Fe--Si, Sendust, and iron-based amorphous alloy powders are used for powder magnetic cores used in a frequency range of several tens kHz to several hundreds kHz, such as reactors and choke coils.
- the reason is that the resistivity of the material is high, and the eddy current loss generated in the high frequency region can be suppressed.
- the magnetostriction is small, there is an advantage that the amount of strain generated at the time of molding is small.
- the alloy powder is prone to breakage such as chipping and cracking when it is formed into a compact prior to manufacturing a powder magnetic core, and has a problem that it collapses due to a slight load during compression molding.
- the present invention has been made to address such problems, and has a dust magnetic material which is excellent in work safety at the time of dust core production and has a low environmental load, and compression molded using this magnetic material. It is an object of the present invention to provide a powder magnetic core having high magnetic flux density, high magnetic permeability, low core loss, and excellent mechanical strength, and a method of manufacturing the same.
- the dust core material of the present invention is characterized by containing a granulated binder, a soft magnetic powder having an insulating film formed on the particle surface, and a glass frit having a softening point of 100 ° C. or less at a magnetic annealing temperature.
- the soft magnetic powder is an iron-based amorphous alloy powder.
- the present invention is characterized in that the compounding amount of the glass frit is 0.3 to 1.0% by mass with respect to the total amount of the soft magnetic powder.
- the granulated binder is characterized in that it is polyvinyl alcohol (hereinafter referred to as PVA) having a degree of polymerization of 1000 or less and a degree of saponification of 50 to 100 mol%.
- PVA polyvinyl alcohol
- the powder magnetic core of the present invention is made of the above-described powder magnetic core material, and is characterized in that the radial crushing strength is 10 MPa or more.
- the method for producing a powder magnetic core according to the present invention comprises the steps of: compressing the powder magnetic core material at a temperature below the melting point of the granulated binder; And magnetic annealing of the compact.
- the dust core material of the present invention includes a granulated binder, a soft magnetic powder having an insulating film formed on the surface of the particles, and a glass frit having a softening point of 100 ° C. or less at the magnetic annealing temperature.
- the glass frit is uniformly dispersed with respect to
- a powder magnetic core having a crush strength of more than 10 MPa can be obtained.
- the compounding amount of the glass frit is 0.3 to 1.0% by mass, a powder magnetic core can be obtained in which the binding between the soft magnetic powders and the permeability are well balanced.
- the method for producing a powder magnetic core according to the present invention includes the steps of compression molding at a temperature lower than the melting point of the granulated binder and the step of magnetic annealing, so that the fluidity of the granulated binder is increased.
- the contact between the soft magnetic powder and the binder is increased, so that the shape retention of the shaped body is dramatically improved.
- the powder magnetic core after magnetic annealing is strengthened by the glass frit melted and solidified in the magnetic annealing step, an iron-based amorphous alloy base powder magnetic core can be obtained.
- the soft magnetic alloy powder has a particle size distribution having a width of 1 to 100 ⁇ m, 30 to 300 ⁇ m or the like. Therefore, high density can be achieved by filling small gaps between large particles.
- a fine powder of 20 ⁇ m or less is blended in a powder magnetic core used in a region of several tens of kHz to several hundreds of kHz, such as a reactor or a choke coil, in order to reduce eddy current loss in a high frequency region.
- the fine powder of 20 ⁇ m or less is extremely poor in fluidity, and it is difficult to automatically insert the powder into the mold, and segregation during transportation (separation of coarse powder and fine powder) and intrusion into the molding die clearance There are problems such as The shape retention of the green compact after compression molding is dominated by the entanglement of the powders at the time of molding.
- the present inventors have blended soft magnetic powders with each other by blending a granulated binder with soft magnetic alloy powder containing fine powder, and after forming.
- the shape-retaining property is enhanced, and breakage such as chipping and cracking during transportation is prevented, and the soft magnetic powder granulated by blending a binder is excellent in fluidity and thus the productivity of the compression core is improved. I found out to do.
- it has been found that it is particularly effective to increase the strength of the dust core by blending a predetermined amount of low softening point glass frit and warm-molding around the melting point of the granulated binder.
- the present invention is based on such findings.
- the soft magnetic powder used for the powder magnetic core material of the present invention includes Fe, Fe-Si, Fe-Si-Al, Fe-Si-Cr, Fe-Ni, Fe-Ni-Mo, Fe-Co, Fe-Co. -V, Fe-Cr, Fe-based amorphous alloy, Co-based amorphous alloy, Fe-based nanocrystalline alloy, metallic glass, etc. can be used. Moreover, you may use these powder in combination of multiple types.
- powders having a spherical particle size are preferable.
- an iron-based amorphous alloy powder is preferable because a magnetic core having high magnetic flux density, high magnetic permeability, and low core loss can be obtained.
- a highly heat resistant insulating coating is formed on the surface of the particles of the soft magnetic powder.
- Any insulating coating may be used without particular limitation as long as it is used for a dust core.
- insulating films can be used alone or in combination of two or more.
- the coating method of an insulation film is not specifically limited, For example, a rolling flow coating method, various chemical conversion treatment etc. can be used.
- the granulated binder which can be used for the powder magnetic core material of the present invention has a function as "glue” or "adhesive” for binding soft magnetic powders to each other.
- glue or "adhesive” for binding soft magnetic powders to each other.
- the soft magnetic powders are adhered to each other, the shape retention after molding becomes high, and breakage such as chipping or cracking during transportation is prevented.
- PVA polyvinyl pyrrolidone
- hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl methyl cellulose phthalate, hypromellose acetate ester succinate etc. can be used as the granulating binder.
- a granulation method a tumbling flow method, a fluidized bed method, a spray drying method, a stirring method, an extrusion method or the like can be used.
- a rolling flow method is preferable in which the binder liquid is sprayed on powder suspended by air and a rotor to granulate.
- water-soluble PVA is preferred.
- PVA having a polymerization degree of 1000 or less, preferably 100 to 1000, and a saponification degree of 50 to 100 mol% is preferable.
- this PVA provides an aqueous solution with low viscosity at the same concentration.
- a low-viscosity PVA aqueous solution as a binder solution, it is possible to obtain a soft magnetic powder uniformly granulated, and it is excellent in compressibility.
- aqueous solution of PVA having a degree of polymerization of 1000 or more and a degree of saponification of 70 to 100 mol% is used as a binder solution
- coarse granulated powder is likely to be formed because the viscosity is high.
- Coarse granulated powder of several hundred ⁇ m or more has good flowability, but it has low bulk density and it is difficult to obtain a high density magnetic core even if high-pressure molding is performed.
- This granulated powder having a low apparent density even if high pressure molding is performed, a loss of molding pressure occurs due to the friction between the powders, so it is difficult to obtain a high density magnetic core. Therefore, not only the magnetic properties such as permeability and iron loss are improved but also the strength is significantly reduced.
- the blending ratio of the granulated binder is preferably 0.3 to 1.0% by mass with respect to the total amount of the soft magnetic powder.
- the glass frit which can be used for the dust core material of the present invention can be used as long as it has a softening point of 100 ° C. or less of the magnetic annealing temperature.
- the magnetic annealing temperature is a processing temperature performed to remove crystal distortion generated in each processing step such as production of soft magnetic metal powder and compression molding.
- an inert atmosphere such as nitrogen or argon
- an atmosphere such as air, air, an oxidizing atmosphere such as oxygen or steam, or a reducing atmosphere such as hydrogen
- the temperature of magnetic annealing is 600 to 700 ° C.
- the temperature is about 700 to 850 ° C. for -V, Fe-Cr, etc., and about 450 to 550 ° C. for Fe-based amorphous alloys and Co-based amorphous alloys.
- the holding time of the magnetic annealing is about 5 to 60 minutes depending on the size of the part, and is set so that the inside of the part can be sufficiently heated.
- the glass frit has a softening point 100 ° C. or less, preferably 100 to 250 ° C. lower than the magnetic annealing temperature, more preferably Choose one that is 200 to 250 ° C lower.
- the composition of the glass frit not only enhances the strength after annealing but also improves the flowability of the powder.
- the compounding amount of the glass frit is preferably 0.3 to 1.0% by mass with respect to the total amount of the soft magnetic powder. By setting this range, it is possible to achieve both high permeability of more than 50 and high-pressure ring strength of more than 15 MPa.
- TeO 2 system, V 2 O 5 system, SnO system, ZnO system, P 2 O 5 system, SiO 2 system, B 2 O 3 system, Bi 2 O 3 , Al 2 O 3 system, TiO 2 A system etc. can be used and you may use these in combination of multiple types.
- SnO-based, P 2 O 5 -based, TeO 2 -based, V 2 O 5- based and combinations thereof are characterized by low softening point, and are particularly effective for increasing the strength at low temperature firing.
- group shows a low softening point, there exists a problem with low environmental compatibility and it should not be used.
- the particle size of the glass frit can be selected in the range of 0.1 to 20 ⁇ m, but the finer the particle size, the higher the contact point with the soft magnetic metal powder, and the higher the strength.
- the powder magnetic core material of the present invention can be blended with a solid lubricant as required.
- the soft magnetic metal powder used in the present invention is less likely to be plastically deformed, so that spring back at the time of mold release is unlikely to occur, and compression molding and mold release are easily possible without compounding a solid lubricant.
- the compounding amount is preferably at most about 1% by mass. If the compounding is excessive, the magnetic properties and the strength decrease due to the lowering of the density of the green compact.
- solid lubricants zinc stearate, calcium stearate, magnesium stearate, barium stearate, lithium stearate, iron stearate, aluminum stearate, stearic acid amide, ethylenebisstearic acid amide, oleic acid amide, ethylenebisolein Acid amide, erucic acid amide, ethylene biserucic acid amide, lauric acid amide, palmitic acid amide, behenic acid amide, ethylene biscapric acid amide, ethylene bishydroxystearic acid amide, montanic acid amide, polyethylene, polyethylene oxide, starch, Molybdenum sulfide, tungsten disulfide, graphite, boron nitride, polytetrafluoroethylene, lauroyl lysine, melamine cyanurate and the like can be mentioned. These may be used alone or in combination of two or more.
- the solid lubricant can be mixed using a V-type
- a method of manufacturing a dust core using Fe-based amorphous alloy powder will be described as an example.
- the Fe-based amorphous alloy powder and the glass frit are uniformly dispersed in the granulated binder solution.
- the alloy powder can be dispersed in a granulation binder solution, and when the glass frit is compounded at the time of granulation, it can be dispersed uniformly.
- the granulated iron-based amorphous alloy powder is filled in a mold and compression molded at a temperature below the melting point of the granulated binder.
- the state at the time of compression molding is shown in FIG. FIG. 1 (a) shows a schematic view after compression molding at room temperature
- Granulated binder 2 is dispersed between particles of soft magnetic powder 1 such as iron-based amorphous alloy powder (FIG. 1 (a)). Moreover, after warm processing, soft magnetic powder 1 comrades adhere by the granulated binder 2 fuse
- the compression molding pressure is 1000 to 2000 MPa, more preferably 1500 to 2000 MPa.
- the compression molding temperature is a temperature below the melting point of PVA.
- fusing point here means the temperature below melting
- Magnetic annealing is performed on the compression molded body. It is carried out to relieve stress inside the iron-based amorphous alloy powder generated during compression molding and so on and to melt the glass frit.
- the state at the time of magnetic annealing is shown in FIG. FIG. 2 (a) shows a schematic view at the start of magnetic annealing
- FIG. 2 (b) shows a schematic view after magnetic annealing.
- Glass frit 3 is dispersed between particles of soft magnetic powder 1 such as iron-based amorphous alloy powder (FIG. 2 (a)). Further, after the magnetic annealing, particles of the soft magnetic powder 1 are fixed by the glass frit 3 (FIG. 2 (b)).
- the granulated binder is thermally decomposed at the temperature at the magnetic annealing.
- the softened and melted glass frit bonds the iron-based amorphous alloy powder together to increase the strength of the formed body.
- a degreasing step is appropriately provided after the magnetic annealing.
- Examples 1 to 5 and Comparative Examples 1 to 2 As iron-based amorphous alloy powders used in Examples 1 to 5 and Comparative Examples 1 to 2, a powder of an Fe—Cr—Si—B—C type composition having a particle size distribution of 1 to 200 ⁇ m was prepared. The insulating coating of this iron-based amorphous alloy powder was sodium silicate, and a rolling flow device was used to form an insulating coating having a thickness of about 5 to 50 nm.
- PVA trade name: JMR-8M, polymerization degree 190, degree of saponification 65.4 mol%, melting point 145 ° C. manufactured by Nippon Shokubai Bi-Poval Co., Ltd.
- PVA aqueous solution was prepared, and 10 mass% PVA aqueous solution was prepared.
- TeO 2 ⁇ V 2 O 5 based glass frit particle diameter: 1 ⁇ m
- glass frit on the surface of iron based amorphous alloy powder could be dispersed uniformly.
- the compounding quantity (as solid content) of PVA was 0.5 mass% with respect to the iron-type amorphous alloy powder whole quantity.
- 0.5 mass% of zinc stearate was mix
- the above mixture was granulated with MP-01 rolling flow device manufactured by Powrex Corporation.
- Granulated powder was compression molded at 1470 MPa using a mold capable of forming a ring-shaped test piece of outer diameter 20 mm ⁇ inner diameter 2 mm ⁇ height 6 mm.
- the mold temperature and the powder temperature during compression molding were heated to room temperature to 200 ° C.
- the powder compact was obtained by magnetically annealing the compression molded body at 480 ° C. for 15 minutes in the air atmosphere.
- the density, initial permeability, and core loss of the obtained ring-shaped test piece were measured by the following methods. Further, the radial crushing strength before and after magnetic annealing was measured by the following method. The measurement results are shown in Table 1.
- [density] Calculated from the size and weight of the dust core. Initial permeability It was calculated from series self-inductance, the number of windings, and dimensions under the condition of a frequency of 1 kHz, using Hokiki Electric Co., Ltd. impedance analyzer IM3570. Iron loss It was measured by Iwatsu Measurement Co., Ltd. BH analyzer SY-8219. [Pressure ring strength] It measured with Shimadzu Corporation autograph precision universal testing machine AG-Xplus.
- the temperature of the mold and powder exceeded 150 ° C., the molded product collapsed after extraction. This is because PVA is melted outside the green compact. As a result, since almost no PVA is used to bind iron-based amorphous alloy powders, the powder core can no longer maintain its shape.
- Example 6 to 8 and Comparative Examples 3 to 7 A powder magnetic core of a ring-shaped test piece was obtained under the same composition and conditions as in Example 5 except that the glass frit (particle diameter: 1 ⁇ m) shown in Table 2 was used. The density, initial permeability, and core loss were measured in the same manner as in Example 5. The measurement results are shown in Table 2 together with Example 5.
- the composition of the glass frit did not greatly affect the density of the compact. Furthermore, the permeability, which is highly correlated with the density, did not change significantly. With reference to Example 5, the higher the softening point of the glass frit, the higher the eddy current loss (high core loss). This is because the softened and fluidized glass frit improves the insulation of the green compact. As in Comparative Examples 3 to 6, when a glass frit having a relatively high melting point is blended, high iron loss is caused as compared with the case where no glass frit is blended (Comparative Example 7). This is because the volume occupied by the iron-based amorphous alloy powder decreases. An improvement in radial crushing strength is recognized by the composition of the glass frit.
- Example 9 to 11 and Comparative Examples 8 to 10 A powder magnetic core of a ring-shaped test piece was obtained under the same conditions and conditions as in Example 5 except that the compounding amount of the glass frit is shown in Table 3. The density, initial permeability, and core loss were measured in the same manner as in Example 5. The measurement results are shown in Table 3 together with Example 5.
- both high permeability of more than 50 and high pressure ring strength of more than 15 MPa are compatible.
- the compounding amount of the glass frit exceeds 1.0% by mass, the magnetic permeability becomes low below 50, and when it is below 0.3% by mass, a low pressure ring strength below 10 MPa is exhibited. This is because the volume of the iron-based amorphous alloy powder that occupies the magnetic core decreases if the content of the glass frit is too large, and the magnetic permeability becomes low. If the content is too small, the effect of bonding the powder to the glass frit Is low.
- the glass frit is uniformly dispersed in the iron-based amorphous alloy powder because the glass frit is blended in the binder aqueous solution.
- the molded product after magnetic annealing is strengthened by the glass frit melted and solidified in the magnetic annealing step.
- a high strength iron-based amorphous alloy base powder magnetic core can be obtained even after compression molding and magnetic annealing.
- the powder magnetic core material of the present invention, the powder magnetic core, and the magnetic core obtained by the manufacturing method thereof have high magnetic flux density, high magnetic permeability, low core loss, and excellent mechanical strength. It can be used as a dust core used in a frequency range of several tens of kHz to several hundreds of kHz.
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Abstract
Description
しかしながら、合金粉末は、圧粉磁心を製造する前段階である成形体としたときに欠けや割れ等の破損が生じやすく、圧縮成形時にわずかな荷重により崩壊してしまうという問題がある。
特に、上記軟磁性粉末が鉄系アモルファス合金粉末であることを特徴とする。また、上記ガラスフリットの配合量が上記軟磁性粉末の全体量に対して、0.3~1.0質量%であることを特徴とする。また、上記造粒バインダーは、重合度1000以下およびけん化度50~100モル%のポリビニルアルコール(以下、PVAという)であることを特徴とする。
鉄系アモルファスなどの軟磁性合金粉末は、硬度が高いため、圧縮成形時の塑性変形性に乏しい。よって、これらの合金粉の高密度化の機構は粒子の再配列が支配的となる。これは圧縮成形時に、各粒子が隙間を探しながら密充填されていくプロセスである。ここで、軟磁性合金粉末が均一な大きさの球状の粒子で構成されていると仮定すると、例え密充填されたとしても粒子間には隙間が生じてしまう。これは密度が低下し、磁束密度、透磁率がともに低下することを示す。通常、軟磁性合金粉末は、1~100μmや30~300 μmなどの幅を有する粒度分布を持つ。このため、大きな粒子同士の隙間を小さな粒子が埋めることで高密度化が可能となる。
軟磁性粉末の中でも球状の粒子径を有する粉末が好ましい。特に鉄系アモルファス合金粉末であることが高磁束密度、高透磁率、低鉄損の磁心を得られるので好ましい。
造粒バインダーとしては、PVA、ポリビニルピロリドン、ヒドロキシプロピルセルロース、ヒドロキシプロピルメチルセルロース、ヒドロキシプロピルメチルセルロースフタレート、ヒプロメロース酢酸エステルコハク酸エステル等が使用できる。また、造粒方法としては、転動流動方式、流動層方式、噴霧乾燥方式、撹拌方式、押し出し方式等が使用できる。これらの中でもエアとローターにより浮遊する粉にバインダー液をスプレーして造粒する転動流動方式が好ましい。
なお、造粒バインダーの配合割合は、軟磁性粉末の全体量に対して、0.3~1.0質量%であることが好ましい。
ガラスフリットの配合量は、軟磁性粉末の全体量に対して、0.3~1.0質量%であることが好ましい。この範囲とすることにより、50を超える高透磁率と15MPaを超える高圧環強さを両立させることができる。
粒径1~200μmの絶縁被覆された鉄系アモルファス合金粉末と、重合度100~1000、けん化度50~100モル%PVAを準備して、5~15質量%の水溶液を調製し造粒バインダー液とする。
Fe系アモルファス合金粉末とガラスフリットとを造粒バインダー液に均一に分散させる。造粒後の粉末にガラスフリットを混合することも可能であるが、造粒バインダー溶液に合金粉末を分散させ、造粒時にガラスフリットを配合した方が、均一に分散できる。
圧縮成形圧力は1000~2000MPa、より好ましくは1500~2000MPaである。圧縮成形温度はPVAの融点付近以下の温度である。ここで融点付近以下の温度とは融点+30℃未満の温度をいう。加温による温間処理は成形体内のPVAを流動させ、形状保持性を高めるために行なう。
実施例1~5および比較例1~2に用いる鉄系アモルファス合金粉として、1~200μmの粒度分布を有するFe-Cr-Si-B-C系組成の粉末を用意した。この鉄系アモルファス合金粉末の絶縁被膜はケイ酸ナトリウムとし、転動流動装置を用いて、5~50nm程度の厚さを有する絶縁被膜を形成した。
造粒バインダーとして、日本酢ビ・ポバール社製PVA(商品名JMR-8M、重合度190、けん化度65.4モル%、融点145℃)を用意し、10質量%PVA水溶液を調製した。このPVA水溶液に、TeO2・V2O5系ガラスフリット(粒径1μm)を鉄系アモルファス合金粉末全体量に対して0.5質量%配合することで、鉄系アモルファス合金粉末表面にガラスフリットを均一に分散させることができた。なおPVAの配合量(固形分として)は鉄系アモルファス合金粉末全体量に対して0.5質量%とした。また、潤滑剤として、鉄系アモルファス合金粉末全体量に対してステアリン酸亜鉛を0.5質量%配合して、混合物を得た。
その後、圧縮成形体を480℃×15分、大気雰囲気中で磁気焼鈍することで圧粉磁心を得た。
[密度]
圧粉磁心の寸法と重量から算出した。
[初透磁率]
日置電機(株)インピーダンスアナライザーIM3570を用い、周波数1kHzの条件で直列自己インダクタンス、巻線数および寸法から算出した。
[鉄損]
岩通計測(株)B-HアナライザSY-8219で測定した。
[圧環強さ]
(株)島津製作所製オートグラフ精密万能試験機AG-Xplusで測定した。
金型および粉末温度が高いほど高強度となった。これは、成形時の温度が高いほどPVAの流動性が向上し、鉄系アモルファス合金粉同士の結着性が向上したためである。
金型および粉末温度が150℃を超えると、抜出後に成形体は崩壊した。これは、PVAが圧粉体の外側に溶融したためである。結果として、鉄系アモルファス合金粉末同士を結着するPVAはほとんどなくなるため、もはや圧粉磁心として形状を保持できなくなった。
表2に示すガラスフリット(粒径1μm)を用いる以外は、実施例5と同一の組成、条件でリング状試験片の圧粉磁心を得た。実施例5と同一の方法で密度、初透磁率、鉄損を測定した。測定結果を実施例5と共に表2に示す。
実施例5を基準として、ガラスフリットの軟化点が高くなるほど、高渦電流損(高鉄損)となった。これは、軟化および流動したガラスフリットが圧粉体の絶縁性を高めるためである。
比較例3~6のように、比較的高融点のガラスフリットを配合した場合、ガラスフリット無配合の場合(比較例7)と比較して高鉄損となった。これは、鉄系アモルファス合金粉が磁心を占める体積が低下するためである。
ガラスフリットの配合により、圧環強さの向上が認められる。特に磁気焼鈍温度より100℃以上低い軟化点のガラスフリットを配合すると、10MPaを超える高い圧環強さを得た。これは、低融点ガラスの流動性の違いによるものである。
ガラスフリットの配合量を表3に示す以外は、実施例5と同一の組成、条件でリング状試験片の圧粉磁心を得た。実施例5と同一の方法で密度、初透磁率、鉄損を測定した。測定結果を実施例5と共に表3に示す。
ガラスフリットの配合量が0.3~1.0質量%の範囲では、50を超える高透磁率と15MPaを超える高圧環強さを両立した。
ガラスフリットの配合量が1.0質量%を超えると、50を下回る低透磁率になり、0.3質量%を下回ると、10MPaを下回る低圧環強さを示した。これは、ガラスフリットの配合量が多すぎると磁心を占める鉄系アモルファス合金粉の体積が小さくなり、低透磁率となったためであり、配合量が少なすぎると、ガラスフリットが粉末を接着する効果が低いためである。
(1)軟化点が磁気焼鈍温度より100℃以上低いガラスフリットの配合により、10MPaを超える高強度圧粉磁心が得られる。
(2)ガラスフリットの配合量を0.3~1.0質量%から選択すると、鉄系アモルファス合金粉同士の結着と透磁率のバランスが取れた圧粉磁心が得られる。
(3)PVAの融点より50℃低い温度で圧縮成形することにより、バインダーの流動性が増し、鉄系アモルファス合金とバインダーの接点が増加するため、成形体の形状保形性が飛躍的に高まる。
(4)バインダー水溶液にガラスフリットを配合しているため、鉄系アモルファス合金粉に対してガラスフリットが均一分散する。
(5)磁気焼鈍工程で融解、固化したガラスフリットにより磁気焼鈍後の成形体が高強度化する。
(6)本発明により、欠けや割れが生じ難くハンドリング性が良好な圧粉磁心が得られる。
(7)以上により、圧縮成形後および磁気焼鈍後においても高強度な鉄系アモルファス合金基圧粉磁心が得られる。
2 造粒バインダー
3 ガラスフリット
Claims (8)
- 造粒バインダーと、粒子表面に絶縁被膜が形成された軟磁性粉末と、磁気焼鈍温度の100℃以下の軟化点を有するガラスフリットとを含むことを特徴とする圧粉磁心材料。
- 前記軟磁性粉末が鉄系アモルファス合金粉末であることを特徴とする請求項1記載の圧粉磁心材料。
- 前記ガラスフリットの配合量が前記軟磁性粉末の全体量に対して、0.3~1.0質量%であることを特徴とする請求項1記載の圧粉磁心材料。
- 前記造粒バインダーは、重合度1000以下およびけん化度50~100モル%のポリビニルアルコールであることを特徴とする請求項1記載の圧粉磁心材料。
- 前記軟磁性粉末が鉄系アモルファス合金粉末であり、
前記ガラスフリットの配合量が前記軟磁性粉末の全体量に対して、0.3~1.0質量%であり、
前記造粒バインダーは、重合度1000以下およびけん化度50~100モル%のポリビニルアルコールであることを特徴とする請求項1記載の圧粉磁心材料。 - 請求項1記載の圧粉磁心材料からなり、圧環強さが10MPa以上であることを特徴とする圧粉磁心。
- 請求項5記載の圧粉磁心材料からなり、圧環強さが10MPa以上であることを特徴とする圧粉磁心。
- 請求項1記載の圧粉磁心材料を用いて製造される圧粉磁心の製造方法であって、
前記圧粉磁心材料を前記造粒バインダーの融点付近以下の温度で圧縮成形する工程と、
前記圧縮成形された圧縮成形体を磁気焼鈍する工程とを備えることを特徴とする圧粉磁心の製造方法。
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JP2018206787A (ja) * | 2017-05-30 | 2018-12-27 | トヨタ自動車株式会社 | 圧粉磁心の製造方法 |
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CN112805795B (zh) * | 2018-10-10 | 2024-12-24 | 味之素株式会社 | 磁性糊料 |
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CN110676044B (zh) * | 2019-09-10 | 2021-06-01 | 东莞艾宝纳米科技有限公司 | 一种高磁导率、低磁芯损耗的磁芯粉复合材料和磁环及其制备方法 |
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KR20180069824A (ko) | 2018-06-25 |
CN108140462B (zh) | 2020-07-07 |
EP3361482A4 (en) | 2019-05-01 |
JP2017073447A (ja) | 2017-04-13 |
CN108140462A (zh) | 2018-06-08 |
EP3361482B1 (en) | 2020-08-12 |
EP3361482A1 (en) | 2018-08-15 |
JP6560091B2 (ja) | 2019-08-14 |
US20180281061A1 (en) | 2018-10-04 |
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