WO2013146299A1 - ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 - Google Patents
ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 Download PDFInfo
- Publication number
- WO2013146299A1 WO2013146299A1 PCT/JP2013/057213 JP2013057213W WO2013146299A1 WO 2013146299 A1 WO2013146299 A1 WO 2013146299A1 JP 2013057213 W JP2013057213 W JP 2013057213W WO 2013146299 A1 WO2013146299 A1 WO 2013146299A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bonded magnet
- resin composition
- particle powder
- ferrite
- ferrite particle
- Prior art date
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/0018—Mixed oxides or hydroxides
- C01G49/0036—Mixed oxides or hydroxides containing one alkaline earth metal, magnesium or lead
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/6261—Milling
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
-
- 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
- H01F1/032—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 hard-magnetic materials
- H01F1/10—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3213—Strontium oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3215—Barium oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5409—Particle size related information expressed by specific surface values
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
Definitions
- the present invention relates to a bonded magnet ferrite particle powder and a bonded magnet resin composition capable of obtaining a bonded magnet molded article having a good tensile elongation, such as the ferrite particle powder and a rotor using the composition.
- the present invention relates to a bonded magnet molded body.
- bond magnets have advantages such as light weight, good dimensional accuracy, and easy mass production of complex shapes compared to sintered magnets, so for toys, office equipment, acoustic equipment, and motors. It is widely used for various applications such as.
- rare earth magnet powders and ferrite particle powders typified by Nd—Fe—B are known.
- rare earth magnet powder has high magnetic properties, it is also expensive and has limited uses.
- ferrite particle powder is inferior in terms of magnetic properties as compared with rare earth magnet powder, but it is inexpensive and chemically stable, so it is used in a wide range of applications.
- Bond magnets are generally manufactured by kneading a rubber or plastics material and magnetic powder and then molding them in a magnetic field or by mechanical means.
- a bonded magnet molded body obtained by injection molding or the like is required to have mechanical strength that can withstand severe use conditions in each use.
- a rotor having a shaft and rotating is used, but a rotor processed into a large and small complex shape is strongly required to have high tensile elongation characteristics because the shaft is inserted.
- the surface magnetic force is increased, and the degree of demagnetization caused by the magnetic field generated by the current supplied to the coil in the motor is small, thereby obtaining high-performance motor characteristics. This is particularly required as an important elemental technology.
- a ferrite particle powder used for a bond magnet and a resin composition for a bond magnet composed of ferrite particles and an organic binder are also required to satisfy the above requirements.
- a method for producing ferrite particle powder (Patent Document 1), a method for controlling the particle size distribution of ferrite particle powder (Patent Document 2), an average particle diameter of 1.50 ⁇ m or more with an alkaline earth metal as a constituent, and a melt flow value
- a method of using a ferrite magnetic powder of 91 g / 10 min or more to form a bonded magnet (Patent Document 3), an average particle diameter of 2.5 ⁇ m or less, a specific surface area of 1.25 m 2 / g or more, and then annealing.
- the average particle diameter measured by a dry air dispersion laser diffraction method is set to Ra ( ⁇ m
- the specific surface area diameter measured by the air permeation method is Da ( ⁇ m)
- a method of controlling Ra ⁇ 2.5 ⁇ m and Ra-Da ⁇ 0.5 ⁇ m (Patent Document 4)
- chloride saturation Ferrite fired at a temperature of 1050 to 1300 ° C under vapor pressure is mixed with fine ferrite powder with a small particle size and annealed at a temperature of 800 to 1100 ° C.
- a method of obtaining a ferrite having an energy product of 2.0 MGOe or more with a low coercive force drop is known.
- the bonded magnet molded article using the ferrite particle powder or the resin composition for bonded magnet described in the above-mentioned Patent Documents 1 to 5 is excellent in all of high magnetic force, demagnetization resistance against external magnetic field, and mechanical strength. It's hard to say.
- a technical object of the present invention to obtain a ferrite particle powder for a bond magnet and a resin composition for a bond magnet from which a bonded magnet excellent in high magnetic force, resistance to demagnetization against an external magnetic field, and mechanical strength can be obtained.
- the present invention provides a ferrite powder for bonded magnets having a bulk density of 0.75 g / cm 3 or less and a compressibility of 65% or more (Invention 1).
- the present invention also relates to ferrite particles for bonded magnets according to the present invention 1 having an average particle diameter of 0.9 to 3.0 ⁇ m (Invention 2).
- the present invention is the ferrite particle powder for bonded magnets according to the present invention 1 or 2, which is a magnetoplumbite type ferrite particle powder (Invention 3).
- the present invention is characterized in that the ferrite powder for bonded magnets according to any one of the present inventions 1 to 3 is contained in an amount of 83 to 93% by weight and an organic binder component is contained in an amount of 7 to 17% by weight. It is a resin composition for bonded magnets (Invention 4).
- the present invention provides a molded article characterized by using any one of the ferrite particle powders for bonded magnets according to any one of the present inventions 1 to 3 or the resin composition for bonded magnets according to the present invention 4. There is (Invention 5).
- this invention is a molded object of this invention 5 characterized by a molded object being a rotor. It is. (Invention 6).
- the ferrite particle powder for bonded magnets according to the present invention has powder characteristics in which the bulk density is controlled to 0.75 g / cm 3 or less and the degree of compression is controlled to 65% or more, so that it has excellent dispersibility in the organic binder.
- This magnetic powder is suitable as a magnetic powder for bonded magnets.
- the resin composition for bonded magnets according to the present invention contains a ferrite for bonded magnets, an organic binder, a silane coupling agent, and the like, and a molded article having excellent strength and magnetic properties is obtained, the resin composition for bonded magnets is used. Is preferred.
- the bonded magnet resin composition according to the present invention is excellent in tensile elongation, it is suitable as a rotor.
- the ferrite particle powder for bonded magnet according to the present invention (hereinafter referred to as “ferrite particle powder”) will be described.
- the composition of the ferrite particle powder according to the present invention is not particularly limited as long as it is a magnetoplumbite type ferrite, and may be either Sr-based ferrite particle powder or Ba-based ferrite particle powder. Moreover, you may contain dissimilar elements, such as La, Nd, Pr, Co, Zn.
- the bulk density of the ferrite particle powder according to the present invention is 0.75 g / cm 3 or less. If it exceeds 0.75 g / cm 3 , the initial kneading torque is difficult to stand, and the ferrite particles do not disperse well in the resin, which is not preferable. It is preferably 0.60 to 0.73 g / cm 3 , more preferably 0.62 to 0.72 g / cm 3 .
- the compressibility of the ferrite particle powder according to the present invention is 65% or more. If it is less than 65%, since the voids contained in the powder are large, the blend is difficult to bite into the kneader and the filling property is also lowered, which is not preferable. More preferably, it is 65 to 75%.
- the degree of compression is defined by the method described in the examples described later.
- the average particle size of the ferrite particle powder according to the present invention is preferably 0.9 to 3.0 ⁇ m.
- the average particle size is outside the range of 0.9 to 3.0 ⁇ m, it becomes difficult to obtain a bonded magnet having high magnetic properties because high filling cannot be performed when forming a bonded magnet. More preferably, it is 0.9 to 2.5 ⁇ m, and still more preferably 1.0 to 2.0 ⁇ m.
- the BET specific surface area value of the ferrite particle powder according to the present invention is preferably 1.4 to 2.0 m 2 / g.
- the ferrite particle powder according to the present invention has a substantially hexagonal plate shape.
- the average thickness of the plate-like particles is preferably 0.2 to 1.0 ⁇ m when observed with a scanning electron microscope. When the average thickness is outside the above range, it is difficult to obtain a bonded magnet having high magnetic characteristics because high filling cannot be performed when forming a bonded magnet.
- the thickness is preferably 0.3 to 1.0 ⁇ m, more preferably 0.4 to 0.7 ⁇ m.
- the plate ratio (plate surface diameter / thickness) of the ferrite particle powder according to the present invention is the ratio of the average plate surface diameter and the average thickness of each ferrite particle measured by observation with a scanning electron microscope. And 1.0 to 10 is preferable.
- the saturation magnetization value ⁇ s of the ferrite particle powder according to the present invention is preferably 65.0 to 73.0 Am 2 / kg (65.0 to 73.0 emu / g), and the coercive force Hc is 206.9 to 279 kA / m ( 2600 to 3500 Oe), and Br is preferably 160 to 200 mT (1600 to 2000 G).
- the ferrite particle powder according to the present invention is prepared by mixing and mixing raw material powders at a predetermined mixing ratio, and calcining the resulting raw material mixed powder in the air at a temperature range of 900 to 1250 ° C. Then, annealing heat treatment is performed in the air at a temperature range of 700 to 1100 ° C., compression and grinding treatment, and finally crushing treatment.
- the raw material powder may be appropriately selected from oxide powders, hydroxide powders, carbonate powders, nitrate powders, sulfate powders, chloride powders and the like of various metals that form magnetoplumbite ferrite.
- the particle size is preferably 2.0 ⁇ m or less.
- a flux to the raw material mixed powder and fire it.
- various fluxes can be used.
- the addition amount is preferably 0.1 to 10 parts by weight per 100 parts by weight of the raw material mixed powder. More preferred is 0.1 to 8.0 parts by weight.
- Bi 2 O 3 may be added to and mixed with the raw material mixed powder or the pulverized powder after firing.
- large particles and small particles may be mixed from the viewpoint of control of particle size distribution and average volume diameter.
- the compression / milling process involves rolling two heavy rollers on a fixed horizontal disk, and is a process performed by the compression and wear action of the rollers. To do.
- a processing apparatus it is preferable to use a sand mill, an edge runner, a raking machine, a roller mill or the like.
- the final crushing process is a process that breaks up the agglomerated state in which the compacted agglomerates generated by the compression / milling process are dispersed or unraveled with a relatively weak force, and an impact crusher such as a hammer mill or a pin mill is used. It is good.
- a classification mechanism such as a screen may be incorporated.
- the ratio of the ferrite particle powder in the resin composition for bonded magnets is 83 to 93 parts by weight, and the total amount of the organic binder component and the silane coupling agent component is 17 to 7 parts by weight.
- the organic binder is not particularly limited as long as it is used in conventional bonded magnets.
- Rubber, vinyl chloride resin, ethylene-vinyl acetate copolymer resin, ethylene-ethyl acrylate copolymer resin, PPS resin, polyamide ( Nylon) resin, polyamide elastomer, polymerized fatty acid-based polyamide and the like can be selected and used depending on the application, but when priority is given to the strength and rigidity of the molded body, a polyamide resin is suitable.
- well-known mold release agents such as a zinc stearate and a calcium stearate, can be added as needed.
- silane coupling agent of the present invention those having any one of a vinyl group, an epoxy group, an amino group, a methacryl group, and a mercapto group as a functional group, and a methoxy group or an ethoxy group can be used.
- a vinyl group, an epoxy group, an amino group, a methacryl group, and a mercapto group as a functional group
- a methoxy group or an ethoxy group can be used as a vinyl group, an epoxy group, an amino group, a methacryl group, and a mercapto group as a functional group, and a methoxy group or an ethoxy group.
- the residual magnetic flux density Br of the resin composition for bonded magnets according to the present invention is preferably 230 mT (2300 G) or more, more preferably 235 mT (2350 G) or more in a magnetic measurement method described later.
- the coercive force iHc is preferably 206.9 to 278.5 kA / m (2600 to 3500 Oe), more preferably 214.9 to 258.6 kA / m (2700 to 3250 Oe).
- the maximum energy product BHmax is preferably 10.3 kJ / m 3 (1.30 MGOe) or more, more preferably 10.7 kJ / m 3 (1.35 MGOe) or more.
- the resin composition for bonded magnets according to the present invention can be obtained by a known method for producing a resin composition for bonded magnets.
- a silane coupling agent or the like is added to the ferrite particle powder according to the present invention and mixed uniformly. It is obtained by uniformly mixing with an organic binder component, then melt-kneading using a kneading extruder or the like, and pulverizing or cutting the kneaded product into granules or pellets.
- the addition amount of the silane coupling agent is 0.15 to 3.5 parts by weight, preferably 0.2 to 3.0 parts by weight, with respect to 100 parts by weight of the ferrite particle powder according to the present invention. .
- test piece molded body for tensile elongation evaluation according to the present invention will be described.
- the test piece molded body was prepared by uniformly mixing the ferrite magnetic powder for bonded magnet and the organic binder component in advance and / or melt-kneading after mixing them, pulverizing or cutting into pellets, and as a resin composition for bonded magnet. Injected into a mold cavity at 80 ° C. in a molten state to obtain a test piece molding having a total length of 175 mm, a total width of 12.5 mm, and a thickness of 3.2 mm.
- ⁇ Action> By controlling the ferrite particle powder according to the present invention to a bulk density of 0.75 g / cm 3 or less and a degree of compression of 65% or more, a molded article comprising the ferrite particle powder of the present invention and / or the resin composition for bonded magnets. Although it is not yet clear that the tensile elongation of is excellent, the present inventor presumes as follows.
- the ferrite particle powder according to the present invention has a bulk density of 0.75 g / cm 3 or less and a compressibility of 65% or more, so that a resin mixture having a good filling property can be easily bitten into a kneader, It is presumed that when the initial torque is appropriately applied, an ideal dispersion state is obtained in the organic binder.
- the resin composition for bonded magnets according to the present invention contains 83 wt% to 93 wt% of the above-mentioned ferrite particle powder for bonded magnets and 7 wt% to 17 wt% of the organic binder component. It is estimated that the organic binder is uniform and ideally dispersed.
- a typical embodiment of the present invention is as follows.
- the average particle diameter of the ferrite particle powder according to the present invention was measured using “Powder Specific Surface Area Measuring Device SS-100” (manufactured by Shimadzu Corporation).
- the BET specific surface area of the ferrite particle powder according to the present invention was measured using a “fully automatic specific surface area meter Macsorb model-1201” (manufactured by Mountec Co., Ltd.).
- the compression density of the ferrite particle powder according to the present invention the density when the particle powder was compressed at a pressure of 1 t / cm 2 was adopted.
- the bulk density of the ferrite particle powder according to the present invention was measured according to JIS K 5101-12-1.
- the tap density of the ferrite particle powder according to the present invention was measured according to JIS K 5101-12-2.
- the saturation magnetic flux density Br and the coercive force iHc of the ferrite particle powder are obtained by compressing the particle powder with a pressure of 1 t / cm 2 using a “DC magnetization characteristic automatic recording device 3257” (manufactured by Yokogawa Hokushin Electric Co., Ltd.). ) And measured in a magnetic field of 14 kOe.
- the melt mass flow rate (MFR) of the resin composition for bonded magnets was obtained by melting at 270 ° C. and measuring with a 10 kg load in accordance with JIS K7210.
- the molding density of the resin composition for bonded magnets was determined by using the electronic magnetometer EW-120SG (Co., Ltd.) as the core formed by melting the bonded magnet composition in a 25 mm ⁇ , 10.5 mm high mold. Measured by Yasuda Seiki Seisakusho).
- the water content of the resin composition for bonded magnets was determined by measuring with a “trace moisture measuring device AQ-7” (manufactured by Hiranuma Sangyo Co., Ltd.) with a moisture vaporization accessory device EV-6 (manufactured by Hiranuma Sangyo Co., Ltd.).
- the magnetic properties (residual magnetic flux density Br, coercive force iHc, coercive force bHc, maximum energy product BHmax) of the resin composition for bonded magnets are obtained by melting the bonded magnet composition in a mold having a height of 25 mm ⁇ and 10.5 mm.
- the state was determined by measuring in a magnetic field of 14 kOe using a “DC magnetization characteristic automatic recording device 3257” (manufactured by Yokogawa Hokushin Electric Co., Ltd.) after magnetic field orientation at 9 kOe.
- the injection molding using the bonded magnet tree composition was a test piece molded body having a total length of 175 mm, a total width of 12.5 mm, and a thickness of 3.2 mm, using an injection molding machine J20MII manufactured by Nippon Steel. The injection pressure at the time of the injection molding of the test piece was recorded, and the injection property was judged.
- Test pieces were obtained using an injection molding machine J20MII manufactured by Nippon Steel Co., Ltd., and then measured using a computer measurement control type precision universal testing machine AG-1 manufactured by Shimadzu Corporation.
- the obtained granulated material was fired at 1180 ° C. for 2 hours in the air.
- the obtained fired product was roughly pulverized and then pulverized with a wet attritor for 30 minutes, washed with water, filtered and dried. Thereafter, a mixed solution of isopropyl alcohol and triethanolamine was added, and the mixture was further pulverized with a vibration mill for 30 minutes. At this time, the amount of isopropyl alcohol and triethanolamine added was 0.2% by weight and 0.1% by weight of the mixed solution with respect to the wet pulverized dry product, respectively, It heat-processed in air
- Table 1 The production conditions are shown in Table 1, and the properties of the obtained magnetic powder for bond ferrite are shown in Table 2.
- Example 2 Ferrite particle powder was prepared in the same manner as in the above-described embodiment except that the composition, the type of additive and the amount added were variously changed. The production conditions are shown in Table 1, and the properties of the obtained magnetic powder for bond ferrite are shown in Table 2.
- Comparative Examples 1 and 3 The ferrite particle powders after the heat treatment of Examples 1 and 2 were referred to as Comparative Examples 1 and 3. The production conditions are shown in Table 1, and the properties of the obtained magnetic powder for bond ferrite are shown in Table 2.
- Comparative Examples 2 and 4 The ferrite particle powders after the compression and grinding treatment of Examples 1 and 2 were referred to as Comparative Examples 2 and 4.
- the production conditions are shown in Table 1, and the properties of the obtained magnetic powder for bond ferrite are shown in Table 2.
- Example 3 Manufacture of resin composition for bonded magnet> 25,000 g of the ferrite particle powder obtained in Example 1 is put in a Henschel mixer, and 0.5 wt% of an aminoalkyl silane coupling agent is added to the ferrite and mixed until uniform for 20 minutes. After adding 2,817 g of .60 12-nylon resin, the mixture was further mixed for 30 minutes to prepare a resin composition for a bonded magnet.
- the obtained mixture of bonded magnet compositions is quantitatively fed to a biaxial kneader and kneaded at a temperature at which 12-nylon is melted.
- the kneaded product is taken out as a strand and taken out into a pellet size of 2 mm ⁇ ⁇ 3 mm.
- Table 3 shows the production method and characteristics of the resin composition for bonded magnets.
- Example 4 The resin composition for bonded magnets composed of the ferrite particle powder obtained in Example 2, 12-nylon resin, and silane coupling agent was used in various amounts to add 12-nylon resin, silane coupling agent, and release agent. It was prepared in the same manner as in Example 3. Table 3 shows the characteristics of the resin composition for bonded magnets.
- Comparative Examples 5 and 6 Resin compositions for bonded magnets comprising variously obtained ferrite particle powder, 12-nylon resin, and silane coupling agent were prepared in the same manner as in Example 3. Table 3 shows the characteristics of the resin composition for bonded magnets.
- Comparative Examples 7 and 8 Resin compositions for bonded magnets comprising variously obtained ferrite particle powder, 12-nylon resin, and silane coupling agent were prepared in the same manner as in Example 4. Table 3 shows the characteristics of the resin composition for bonded magnets.
- Example 5 ⁇ Molding of test piece molding> After the bonded magnet resin composition obtained in Example 3 was dried at 100 ° C. for 3 hours, the bonded magnet resin composition was melted at 300 ° C. in an injection molding machine, and the injection time was 0.3 seconds to 80 ° C. A test piece molded body having a total length of 175 mm, a total width of 12.5 mm, and a thickness of 3.2 mm was prepared by injection molding into a set mold. Table 4 shows the injection properties and various properties of the test piece molded body.
- Example 6 A test piece molded body was prepared in the same manner as in Example 5 except that the melt temperature of the bonded magnet resin composition prepared in Example 4 was changed to 280 ° C. Table 4 shows the injection properties and various properties of the test piece molded body.
- Comparative Examples 9 to 10 Test piece molded bodies were prepared in the same manner as in Example 5 using various resin compositions for bonded magnets. Table 4 shows the injection properties and various properties of the test piece molded body.
- Comparative Examples 11-12 Test piece molded bodies were prepared in the same manner as in Example 6 using various resin compositions for bonded magnets. Table 4 shows the injection properties and various properties of the test piece molded body.
- Example 5 is superior to Comparative Examples 9 and 10
- Example 6 is a comparative example. 11 and 12 and both were confirmed to have excellent properties.
- the bonded magnet manufactured using the ferrite particle powder and / or the resin composition for bonded magnets according to the present invention is excellent in bending strength and magnetic properties
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
である。(本発明6)。
本発明に係るフェライト粒子粉末の組成は、特に限定されるものではなく、マグネトプランバイト型フェライトであればよく、Sr系フェライト粒子粉末、Ba系フェライト粒子粉末のいずれでもよい。また、La、Nd、Pr、Co、Zn等の異種元素を含有してもよい。
本発明に係るフェライト粒子粉末をかさ密度が0.75g/cm3以下で圧縮度が65%以上に制御することで、本発明のフェライト粒子粉末および/またはボンド磁石用樹脂組成物からなる成型体の引張伸びが優れることについては未だ明らかではないが、本発明者は次のように推定している。
圧縮度=(タップ密度-かさ密度)/タップ密度×100 (%)
<フェライト粒子粉末の製造>
粉末状のα-Fe2O3を100重量部と、SrCO3を15.9重量部(FeとSrのモル比は2Fe:Sr=5.95:1)秤量して、湿式アトライターで30分混合した後、濾過、乾燥した。得られた原料混合粉末にSrCl2・6H2O及びNa2B4O7の水溶液をそれぞれ添加してよく混合した後、造粒した。この時、SrCl2・6H2O及びNa2B4O7の添加量は、上記原料混合粉末に対してそれぞれ5.5重量%、0.5重量%とした。得られた造粒物を大気中1180℃で2時間焼成した。得られた焼成物を粗粉砕した後に、湿式アトライターで30分粉砕し、水洗、濾過、乾燥した。その後、イソプロピルアルコール及びトリエタノールアミンの混合溶液を添加して、更に振動ミルで30分間粉砕した。この時、イソプロピルアルコール及びトリエタノールアミンの添加量は、上記湿式粉砕乾燥品に対してそれぞれ0.2重量%、0.1重量%の混合溶液を添加して、次いで、得られた粉砕物を大気中950℃で1.5時間熱処理した。その後、サンドミルで加重45kg/cmで30分間圧縮・摩砕処理を行い、更にピンミルで解砕処理した。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
組成、添加剤の種類及び添加量などを種々変化させた以外は、前記発明の実施の形態と同様にしてフェライト粒子粉末を作成した。
製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
前記実施例1、2の熱処理後のフェライト粒子粉末を比較例1、3とした。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
前記実施例1、2の圧縮・摩砕処理後のフェライト粒子粉末を比較例2、4とした。製造条件を表1に、得られたボンドフェライト用磁性粉の特性を表2に示す。
<ボンド磁石用樹脂組成物の製造>
実施例1で得られたフェライト粒子粉末をヘンシェルミキサーに25000g入れ、アミノアルキル系シランカップリング剤をフェライトに対して0.5wt%添加して20分間均一になるまで混合し、さらに、相対粘度1.60の12-ナイロン樹脂を2817g投入した後、さらに30分間混合してボンド磁石用樹脂組成物の混合物を用意した。
ボンド磁石用樹脂組成物の製法と特性を表3に示す。
実施例2で得られたフェライト粒子粉末と12-ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を12-ナイロン樹脂、シランカップリング剤、離型剤の添加量を種々変化させて前記実施例3と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
種々得られたフェライト粒子粉末と12-ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を前記実施例3と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
種々得られたフェライト粒子粉末と12-ナイロン樹脂、シランカップリング剤からなるボンド磁石用樹脂組成物を前記実施例4と同様にして作成した。
ボンド磁石用樹脂組成物の特性を表3に示す。
<試験片成形体の成形>
実施例3で得られたボンド磁石用樹脂組成物を100℃で3時間乾燥した後、射出成型機においてボンド磁石用樹脂組成物を300℃で溶融し、射出時間0.3秒で80℃に設定された金型に射出成形して、全長175mm、全幅12.5mm、厚み3.2mmの試験片成形体を用意した。試験片成形体の射出性及び諸特性を表4に示す。
実施例4で作成したボンド磁石用樹脂組成物を、溶融温度を280℃にした以外は前記実施例5と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
種々のボンド磁石用樹脂組成物を用いて、前記実施例5と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
種々のボンド磁石用樹脂組成物を用いて、前記実施例6と同様にして試験片成形体を作成した。試験片成形体の射出性及び諸特性を表4に示す。
Claims (6)
- かさ密度が0.75g/cm3以下であって圧縮度が65%以上であることを特徴とするボンド磁石用フェライト粒子粉末。
- 平均粒子径が0.9~3.0μmである請求項1記載のボンド磁石用フェライト粒子粉末。
- マグネトプランバイト型フェライト粒子粉末である請求項1又は2記載のボンド磁石用フェライト粒子粉末。
- 請求項1~3のいずれかに記載のボンド磁石用フェライト粒子粉末を83重量%から93重量%含有し、有機バインダー成分を7重量%から17重量%含有することを特徴とするボンド磁石用樹脂組成物。
- 請求項1~3のいずれかに記載のボンド磁石用フェライト粒子粉末、又は請求項4記載のボンド磁石用樹脂組成物のいずれかを用いたことを特徴とする成型体。
- 成型体がロータであることを特徴とする請求項4記載の成型体。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201380016566.7A CN104205253B (zh) | 2012-03-30 | 2013-03-14 | 粘结磁铁用铁氧体颗粒粉末、粘结磁铁用树脂组合物和使用这些的成型体 |
KR1020147026187A KR102090346B1 (ko) | 2012-03-30 | 2013-03-14 | 본드 자석용 페라이트 입자 분말, 본드 자석용 수지 조성물 및 그것들을 사용한 성형체 |
US14/389,102 US9691528B2 (en) | 2012-03-30 | 2013-03-14 | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
EP13767468.5A EP2833377B1 (en) | 2012-03-30 | 2013-03-14 | Ferrite particulate powder for bonded magnet, resin composition for bonded magnet, and moldings using same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012-079532 | 2012-03-30 | ||
JP2012079532A JP5360445B2 (ja) | 2012-03-30 | 2012-03-30 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013146299A1 true WO2013146299A1 (ja) | 2013-10-03 |
Family
ID=49259562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2013/057213 WO2013146299A1 (ja) | 2012-03-30 | 2013-03-14 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
Country Status (6)
Country | Link |
---|---|
US (1) | US9691528B2 (ja) |
EP (1) | EP2833377B1 (ja) |
JP (1) | JP5360445B2 (ja) |
KR (1) | KR102090346B1 (ja) |
CN (1) | CN104205253B (ja) |
WO (1) | WO2013146299A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3057110A4 (en) * | 2013-10-02 | 2017-04-12 | Toda Kogyo Corporation | Ferrite particle powder for bonded magnet, resin composition for bonded magnet, and molded article using ferrite particle powder and resin composition |
US9691528B2 (en) | 2012-03-30 | 2017-06-27 | Toda Kogyo Corp. | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
US11820055B2 (en) | 2013-04-03 | 2023-11-21 | Toda Kogyo Corp. | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101385869B1 (ko) * | 2007-03-30 | 2014-04-17 | 도다 고교 가부시끼가이샤 | 본드 자석용 페라이트 입자 분말, 본드 자석용 수지 조성물및 이들을 이용한 성형체 |
TWI666661B (zh) * | 2015-01-22 | 2019-07-21 | 日商保德科技股份有限公司 | 六角板狀鐵氧體粉末及其製造方法,以及使用該鐵氧體粉末的樹脂組合物及成型體 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55145303A (en) | 1979-04-28 | 1980-11-12 | Toda Kogyo Corp | Manufacture of hexagonal plate shaped magnetplumbite type ferrite particle powder |
JPS6355122A (ja) * | 1986-08-22 | 1988-03-09 | Toshiba Glass Co Ltd | 磁性粉末 |
JPH03218606A (ja) | 1990-01-24 | 1991-09-26 | Bridgestone Corp | 合成樹脂磁石用組成物 |
JP2002308629A (ja) * | 2001-01-23 | 2002-10-23 | Toda Kogyo Corp | 黒色磁性酸化鉄粒子粉末 |
JP2005268729A (ja) | 2004-03-22 | 2005-09-29 | Dowa Mining Co Ltd | ボンド磁石用フェライト磁性粉 |
JP2007214510A (ja) | 2006-02-13 | 2007-08-23 | Dowa Holdings Co Ltd | ボンド磁石用フェライト磁性粉およびその製造方法、並びにボンド磁石 |
JP2008160052A (ja) * | 2006-03-30 | 2008-07-10 | Tdk Corp | フェライト磁石の製造方法 |
JP2009252906A (ja) * | 2008-04-03 | 2009-10-29 | Toda Kogyo Corp | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
JP2010263201A (ja) | 2009-04-09 | 2010-11-18 | Dowa Electronics Materials Co Ltd | ボンド磁石用フェライト粉末およびその製造方法並びにこれを用いたボンド磁石 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61191004A (ja) | 1985-02-20 | 1986-08-25 | Hitachi Metals Ltd | 複合磁石およびその製造方法 |
JPH0797241B2 (ja) | 1986-05-22 | 1995-10-18 | 三田工業株式会社 | 電子写真用トナ−の製法 |
JP3148311B2 (ja) | 1991-10-30 | 2001-03-19 | 戸田工業株式会社 | 磁性トナー用磁性粒子粉末 |
JPH06345439A (ja) * | 1993-06-10 | 1994-12-20 | Toda Kogyo Corp | 磁気記録用磁性酸化鉄粒子用造粒物及びその製造法並びに該造粒物を用いた磁気記録用磁性酸化鉄粒子粉末の製造法 |
US5599627A (en) * | 1993-10-08 | 1997-02-04 | Toda Kogyo Corporation | Magnetic particles comprising magnetite core and process for producing the same |
JP3440741B2 (ja) | 1997-03-04 | 2003-08-25 | 戸田工業株式会社 | 磁気カード用マグネトプランバイト型フェライト粒子粉末 |
JP2000357606A (ja) | 1999-04-14 | 2000-12-26 | Hitachi Metals Ltd | 複合型等方性ボンド磁石およびそれを用いた回転機 |
JP3662778B2 (ja) * | 1999-06-17 | 2005-06-22 | 三井金属鉱業株式会社 | 粒状酸化鉄凝集粉末の製造方法 |
JP4361642B2 (ja) * | 1999-07-19 | 2009-11-11 | 三井金属鉱業株式会社 | 易分散性粒状酸化鉄凝集粒子、該易分散性粒状酸化鉄凝集粒子を含む粉末、および該粉末を含む静電複写磁性トナー、静電潜像現像用キャリア、黒色顔料。 |
CA2368682A1 (en) | 2001-01-23 | 2002-07-23 | Hiromitsu Misawa | Black magnetic iron oxide particles and magnetic toner |
JP3997291B2 (ja) | 2002-01-16 | 2007-10-24 | Dowaエレクトロニクス株式会社 | 電子写真現像用キャリヤ |
JP4889037B2 (ja) | 2006-11-29 | 2012-02-29 | Necトーキン株式会社 | 表面実装型電解コンデンサおよびその製造方法 |
KR101385869B1 (ko) | 2007-03-30 | 2014-04-17 | 도다 고교 가부시끼가이샤 | 본드 자석용 페라이트 입자 분말, 본드 자석용 수지 조성물및 이들을 이용한 성형체 |
JP4924400B2 (ja) * | 2007-12-14 | 2012-04-25 | 日亜化学工業株式会社 | ボンド磁石用組成物およびそれを用いたボンド磁石。 |
JP5360445B2 (ja) | 2012-03-30 | 2013-12-04 | 戸田工業株式会社 | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
-
2012
- 2012-03-30 JP JP2012079532A patent/JP5360445B2/ja active Active
-
2013
- 2013-03-14 EP EP13767468.5A patent/EP2833377B1/en active Active
- 2013-03-14 US US14/389,102 patent/US9691528B2/en active Active
- 2013-03-14 KR KR1020147026187A patent/KR102090346B1/ko active IP Right Grant
- 2013-03-14 CN CN201380016566.7A patent/CN104205253B/zh active Active
- 2013-03-14 WO PCT/JP2013/057213 patent/WO2013146299A1/ja active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55145303A (en) | 1979-04-28 | 1980-11-12 | Toda Kogyo Corp | Manufacture of hexagonal plate shaped magnetplumbite type ferrite particle powder |
JPS6355122A (ja) * | 1986-08-22 | 1988-03-09 | Toshiba Glass Co Ltd | 磁性粉末 |
JPH03218606A (ja) | 1990-01-24 | 1991-09-26 | Bridgestone Corp | 合成樹脂磁石用組成物 |
JP2002308629A (ja) * | 2001-01-23 | 2002-10-23 | Toda Kogyo Corp | 黒色磁性酸化鉄粒子粉末 |
JP2005268729A (ja) | 2004-03-22 | 2005-09-29 | Dowa Mining Co Ltd | ボンド磁石用フェライト磁性粉 |
JP2007214510A (ja) | 2006-02-13 | 2007-08-23 | Dowa Holdings Co Ltd | ボンド磁石用フェライト磁性粉およびその製造方法、並びにボンド磁石 |
JP2008160052A (ja) * | 2006-03-30 | 2008-07-10 | Tdk Corp | フェライト磁石の製造方法 |
JP2009252906A (ja) * | 2008-04-03 | 2009-10-29 | Toda Kogyo Corp | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
JP2010263201A (ja) | 2009-04-09 | 2010-11-18 | Dowa Electronics Materials Co Ltd | ボンド磁石用フェライト粉末およびその製造方法並びにこれを用いたボンド磁石 |
Non-Patent Citations (1)
Title |
---|
See also references of EP2833377A4 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9691528B2 (en) | 2012-03-30 | 2017-06-27 | Toda Kogyo Corp. | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
US11820055B2 (en) | 2013-04-03 | 2023-11-21 | Toda Kogyo Corp. | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
EP3057110A4 (en) * | 2013-10-02 | 2017-04-12 | Toda Kogyo Corporation | Ferrite particle powder for bonded magnet, resin composition for bonded magnet, and molded article using ferrite particle powder and resin composition |
US11823823B2 (en) | 2013-10-02 | 2023-11-21 | Toda Kogyo Corporation | Ferrite particles for bonded magnets, resin composition for bonded magnets, and molded product using the same |
Also Published As
Publication number | Publication date |
---|---|
JP2013211351A (ja) | 2013-10-10 |
EP2833377A1 (en) | 2015-02-04 |
CN104205253A (zh) | 2014-12-10 |
US9691528B2 (en) | 2017-06-27 |
JP5360445B2 (ja) | 2013-12-04 |
KR102090346B1 (ko) | 2020-03-17 |
KR20150002611A (ko) | 2015-01-07 |
EP2833377A4 (en) | 2015-12-09 |
EP2833377B1 (en) | 2017-05-03 |
CN104205253B (zh) | 2017-08-01 |
US20150041702A1 (en) | 2015-02-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5393989B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 | |
JP6468192B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 | |
JP6459963B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 | |
JP4877513B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 | |
CN106795006B (zh) | 粘结磁体用铁氧体颗粒粉末、粘结磁体用树脂组合物以及使用它们的成型体 | |
JP5360445B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 | |
JP4379568B2 (ja) | ボンド磁石用マグネトプランバイト型フェライト粒子粉末、その製造法並びに該マグネトプランバイト型フェライト粒子粉末を用いたボンド磁石 | |
JP5267771B2 (ja) | ボンド磁石用マグネトプランバイト型フェライト粒子粉末及びその製造法、該マグネトプランバイト型フェライト粒子粉末を用いた樹脂組成物、ボンド磁石並びにマグネットロール | |
JP4893680B2 (ja) | ボンド磁石用フェライト粒子粉末、ボンド磁石用樹脂組成物ならびにそれらを用いた成型体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 13767468 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20147026187 Country of ref document: KR Kind code of ref document: A |
|
REEP | Request for entry into the european phase |
Ref document number: 2013767468 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2013767468 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14389102 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |