WO2014069440A1 - フェライト焼結板及びフェライト焼結シート - Google Patents
フェライト焼結板及びフェライト焼結シート Download PDFInfo
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- WO2014069440A1 WO2014069440A1 PCT/JP2013/079221 JP2013079221W WO2014069440A1 WO 2014069440 A1 WO2014069440 A1 WO 2014069440A1 JP 2013079221 W JP2013079221 W JP 2013079221W WO 2014069440 A1 WO2014069440 A1 WO 2014069440A1
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- Prior art keywords
- ferrite
- ferrite sintered
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- plate
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 138
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 229910017816 Cu—Co Inorganic materials 0.000 claims abstract description 27
- 239000011241 protective layer Substances 0.000 claims abstract description 17
- 239000012790 adhesive layer Substances 0.000 claims abstract description 15
- 230000035699 permeability Effects 0.000 abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 13
- 239000002994 raw material Substances 0.000 description 11
- 238000005245 sintering Methods 0.000 description 11
- 229920002799 BoPET Polymers 0.000 description 9
- 238000004891 communication Methods 0.000 description 9
- 239000011812 mixed powder Substances 0.000 description 8
- 239000002002 slurry Substances 0.000 description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000001354 calcination Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- IRIAEXORFWYRCZ-UHFFFAOYSA-N Butylbenzyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCC1=CC=CC=C1 IRIAEXORFWYRCZ-UHFFFAOYSA-N 0.000 description 4
- 229910007565 Zn—Cu Inorganic materials 0.000 description 4
- 239000002390 adhesive tape Substances 0.000 description 4
- 239000011268 mixed slurry Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000004014 plasticizer Substances 0.000 description 4
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009702 powder compression Methods 0.000 description 2
- MFKRHJVUCZRDTF-UHFFFAOYSA-N 3-methoxy-3-methylbutan-1-ol Chemical compound COC(C)(C)CCO MFKRHJVUCZRDTF-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
Classifications
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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
-
- 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
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
- H01F1/34—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 non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
-
- 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
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
-
- 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
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3275—Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite
-
- 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
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3279—Nickel oxides, nickalates, 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
- C04B2235/3281—Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
-
- 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
- C04B2235/3284—Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
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- 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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6025—Tape casting, e.g. with a doctor blade
Definitions
- the present invention provides a ferrite sintered sheet in which an adhesive layer and / or a protective layer is provided on the surface of the ferrite sintered plate and the ferrite sintered plate.
- Communication systems such as mobile phones and smartphones are equipped with systems capable of communicating information using a planar coil antenna, such as NFC (Near Field Communication) and payment systems.
- a soft magnetic sheet is disposed close to the planar coil antenna (Patent Documents 1, 2, and 3).
- the real part ( ⁇ ') of the magnetic permeability of the soft magnetic sheet must be increased. Therefore, it is necessary to reduce the antenna loss by increasing the inductance of the antenna and decreasing the imaginary part ( ⁇ ′′) of the magnetic permeability.
- a ferrite sintered sheet used as a soft magnetic sheet has a characteristic that ⁇ ′′ increases when ⁇ ′ is increased at a communication frequency of 13.56 MHz. Actually, ⁇ ′ is approximately 100 and ⁇ ′′ is approximately 100 ⁇ m. No. 5 ferrite sintered sheet is used.
- the composition is 45 to 50 mol% Fe 2 O 3 in terms of oxide, 10 to 25 mol% NiO, 15 to 36 mol% ZnO, 2 to 14 mol% CuO, 0.1 to 3.5 mol. % CoO (Ni-Zn-Cu-Co ferrite sintered plate characterized by the above).
- the present invention is a ferrite sintered sheet in which an adhesive layer is provided on one surface of the ferrite sintered plate according to the first invention and a protective layer is provided on the opposite surface (the second invention).
- the present invention is a ferrite sintered sheet in which adhesive layers are provided on both surfaces of the ferrite sintered plate according to the first aspect of the present invention (Invention 3).
- the present invention is a ferrite sintered sheet in which protective layers are provided on both surfaces of the ferrite sintered plate described in the present invention 1 (Invention 4).
- the present invention is the ferrite sintered sheet according to any one of the present inventions 2 to 4, wherein at least one groove is formed on at least one surface of the ferrite sintered plate (this book) Invention 5).
- the present invention is a ferrite sintered sheet according to any one of the present inventions 2 to 4, wherein the ferrite sintered plate is divided into small pieces (Invention 6).
- the ferrite sintered plate and ferrite sintered sheet according to the present invention have a large ⁇ ′ and a small ⁇ ′′, they are suitable as members for improving communication sensitivity in a system such as NFC.
- the composition of the Ni—Zn—Cu—Co ferrite according to the present invention is 45 to 50 mol% Fe 2 O 3 , 10 to 25 mol% NiO, 15 to 36 mol% ZnO, and 2 to 14 mol% CuO in terms of oxide. 0.1 to 3.5 mol% CoO.
- composition of Fe 2 O 3 in the Ni—Zn—Cu—Co ferrite according to the present invention is less than 45 mol%, ⁇ ′ becomes small. When it exceeds 50 mol%, it becomes impossible to sinter.
- a more preferable composition of Fe 2 O 3 is 46 to 49.8 mol%.
- composition of NiO in the Ni—Zn—Cu—Co ferrite according to the present invention is less than 10 mol%, ⁇ ′′ increases. When it exceeds 25 mol%, ⁇ ′ decreases. A more preferable composition of NiO is 11 to 23 mol%.
- composition of ZnO in the Ni—Zn—Cu—Co ferrite according to the present invention is less than 15 mol%, ⁇ ′ becomes small. When it exceeds 36 mol%, ⁇ ′′ increases. A more preferable composition of ZnO is 18 to 33 mol%.
- composition of CuO in the Ni—Zn—Cu—Co ferrite according to the present invention is less than 2 mol%, sintering cannot be performed. When it exceeds 14 mol%, ⁇ ′′ increases. A more preferable CuO composition is 3 to 12 mol%.
- composition of CoO in the Ni—Zn—Cu—Co ferrite according to the present invention is less than 0.1 mol%, ⁇ ′′ increases. When it exceeds 3.5 mol%, ⁇ ′ decreases.
- Preferred CoO The composition is 0.12 to 3.3 mol%, more preferably 0.3 to 3.0 mol%, and still more preferably 0.5 to 1.45 mol%.
- the Ni / (Fe 2 O 3 ) ratio in the Ni—Zn—Cu—Co ferrite according to the present invention is preferably 20 to 55 mol%, more preferably 22 to 55 mol%.
- the Zn / (Fe 2 O 3 ) ratio is preferably 30 to 75 mol%, more preferably 31 to 65 mol%.
- the Cu / (Fe 2 O 3 ) ratio is preferably 4.0 to 31.0 mol%, more preferably 10 to 31.0 mol%, and still more preferably 19 to 30.5 mol%.
- the Co / (Fe 2 O 3 ) ratio is preferably 0.2 to 7.5 mol%, more preferably 0.3 to 3.0 mol%.
- the thickness of the ferrite sintered plate according to the present invention is preferably 0.01 to 1 mm. More preferably, it is 0.02 to 1 mm, and still more preferably 0.03 to 0.5 mm.
- the ferrite sintered plate of the present invention is basically not plastically deformed.
- An adhesive layer can be provided on at least one surface of the sintered ferrite plate made of Ni—Zn—Cu—Co ferrite according to the present invention.
- the thickness of the adhesive layer is preferably 0.001 to 0.1 mm.
- a protective layer can be provided on at least one surface of the sintered ferrite plate made of Ni—Zn—Cu—Co ferrite according to the present invention.
- the thickness of the protective layer is preferably 0.001 to 0.1 mm.
- the ⁇ ′ of the sintered ferrite sheet according to the present invention is preferably 80 to 300. More preferably, it is 90 to 290, and still more preferably 110 to 280.
- the ⁇ ′′ of the sintered ferrite sheet according to the present invention is preferably 0.05 to 15. More preferably 0.06 to 10. More preferably 0.07 to 5.0.
- a double-sided adhesive tape is exemplified. It does not restrict
- the protective layer in the present invention can enhance the reliability and durability against powder falling when the sintered ferrite plate is divided by providing this.
- the protective layer is not particularly limited as long as it is a resin that stretches without breaking when the sintered ferrite sheet is bent, and examples thereof include a PET film.
- the ferrite sintered sheet according to the present invention is provided with at least one groove provided in advance on at least one surface of a ferrite sintered plate in order to adhere and adhere to a bent portion and prevent cracking during use.
- the ferrite sintered plate may be configured to be separable from the starting point.
- the groove may be continuous or intermittently formed, and can be substituted for the groove by forming a large number of minute recesses.
- the groove is preferably U-shaped or V-shaped in cross section.
- the ferrite sintered sheet according to the present invention is preferably divided into small pieces in advance so that the sintered ferrite sheet adheres to a bent portion and is attached and prevents cracking during use.
- the ferrite sintered plate is divided in advance from at least one groove provided on at least one surface of the ferrite sintered plate, or the ferrite sintered plate is divided into small pieces without forming a groove. Either method may be used.
- the ferrite sintered plate is divided into triangles, quadrilaterals, polygons of any size or combinations thereof by grooves.
- the length of one side of a triangle, quadrilateral, or polygon is usually 1 to 12 mm, and when the adhesion surface of the adherend is a curved surface, it is preferably 1 mm or more and 1/3 or less of the radius of curvature thereof, More preferably, it is 1 mm or more and 1/4 or less.
- the groove When the groove is formed, it can be intimately or substantially adhered to a cylindrical side curved surface and a surface with some unevenness as well as a flat surface without cracking indefinitely at a place other than the groove.
- the width of the opening of the groove formed in the ferrite sintered plate is usually preferably 250 ⁇ m or less, more preferably 1 to 150 ⁇ m. When the width of the opening exceeds 250 ⁇ m, the decrease in the magnetic permeability of the ferrite sintered plate becomes large, which is not preferable.
- the depth of the groove is usually 1/20 to 3/5 of the thickness of the ferrite sintered plate. In the case of a thin sintered ferrite plate having a thickness of 0.1 mm to 0.2 mm, the depth of the groove is preferably 1/20 to 1/4 of the thickness of the sintered ferrite plate, more preferably 1 / 20 to 1/6.
- ferrite powder is a raw material mixture obtained by mixing raw materials such as oxides, carbonates, hydroxides, and oxalates of each element constituting ferrite in a predetermined composition ratio, or each in an aqueous solution.
- the coprecipitate obtained by precipitating the elements can be obtained by calcination in the air at a temperature range of 700 to 900 ° C. for 1 to 20 hours and then pulverizing.
- ferrite plate After mixing the obtained ferrite powder and binder resin, ferrite plate is formed by powder compression molding method, injection molding method, calendering method, extrusion method, etc., degreased as necessary, then sintered to ferrite Sintered plates can be manufactured. Also, after mixing ferrite powder, binder resin and solvent, a green sheet is obtained by coating with a doctor blade or the like on a film or sheet, and after degreasing as necessary, the obtained green sheet is sintered. It can be processed to produce a sintered ferrite plate. A plurality of obtained green sheets may be laminated.
- the grooves can be formed during the formation of the ferrite plate, after the forming or after the sintering treatment.
- the grooves can be formed during the formation of the ferrite plate, after the forming or after the sintering treatment.
- the sintering treatment For example, when molding by powder compression molding method or injection molding method, it is preferable to form during molding, and when molding by calendar method or extrusion method, it is preferable to form after molding and before sintering, When manufacturing a sintered ferrite board via a sheet
- Degreasing treatment is usually performed at a temperature of 150 to 500 ° C.
- the sintering temperature is usually 850 to 1100 ° C., preferably 860 to 1050 ° C., and more preferably 875 to 905 ° C.
- the sintering time is usually 30 to 180 minutes, preferably 30 to 120 minutes.
- the sintering temperature is less than 850 ° C., it becomes difficult to sinter the particles, and the strength of the obtained sintered ferrite plate cannot be said to be sufficient.
- the sintering temperature exceeds 1100 ° C., the growth of particles proceeds, which is not preferable.
- the sintering time is less than 30 minutes, it becomes difficult to sinter the particles, and the obtained sintered ferrite plate cannot be said to have sufficient strength. Further, since the sintering of the particles proceeds sufficiently when the sintering time is 180 minutes, it is not necessary to increase the sintering time beyond 180 minutes.
- an adhesive layer for example, a double-sided adhesive tape, is provided on the surface of the obtained ferrite sintered plate.
- the adhesive material layer can be formed on one side or both sides of the ferrite sintered plate.
- a protective layer is provided on the surface of the obtained sintered ferrite plate, if necessary.
- the adhesive material layer can be formed on one side or both sides of the ferrite sintered plate.
- the protective layer is formed by adhering a resin film or sheet constituting the protective layer to the surface of the sintered ferrite plate through an adhesive, if necessary, or by applying a paint containing the resin constituting the protective layer. This is done by applying to the surface of the sintered ferrite plate. By forming the protective layer, powder fall of the ferrite sintered plate can be prevented.
- an adhesive layer can be formed on one surface of the ferrite sintered plate, and a protective layer can be formed on the other surface.
- the adhesive layer and / or the protective layer may be formed and then divided by a roller.
- a ferrite sintered plate or ferrite sintered sheet made of Ni—Zn—Cu—Co ferrite having a specific composition has a high ⁇ ′ and a low ⁇ ′′.
- a typical embodiment of the present invention is as follows.
- Ni—Zn—Cu—Co ferrite was measured using a fluorescent X-ray analyzer 3530 (manufactured by Rigaku Corporation).
- the thickness of the ferrite sintered plate and the ferrite sintered sheet was measured with a micrometer.
- the permeability of the ferrite sintered plate and ferrite sintered sheet was measured at a frequency of 13.56 MHz using an impedance / material analyzer E4991A (manufactured by Agilent Technologies) with a ring punched to an outer diameter of 20 mm and an inner diameter of 10 mm. .
- Example 1 Each oxide raw material is weighed so that the composition of Ni—Zn—Cu—Co ferrite becomes a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry is filtered and dried. A mixed powder was obtained. A calcined product obtained by calcining the raw material mixed powder at 730 ° C. for 3 hours was pulverized by a ball mill to obtain a Ni—Zn—Cu—Co ferrite powder according to the present invention.
- grooves having a depth of 100 ⁇ m were formed in a lattice shape at intervals of 3 mm using a blade shape having a V-shaped blade edge.
- the obtained green sheet was degreased at 400 ° C. and then sintered at 1010 ° C. for 2 hours to obtain a Ni—Zn—Cu—Co ferrite sintered plate.
- the composition of the sintered ferrite plate is as follows: Fe 2 O 3 is 49.41 mol%, NiO is 10.17 mol%, ZnO is 35.21 mol%, CuO is 2.09 mol%, and CoO is 3.12 mol%.
- the thickness was 328 ⁇ m.
- a PET film was affixed to one surface of the obtained ferrite sintered plate, and a double-sided tape was affixed to the other surface to obtain a ferrite sintered sheet. The thickness was 390 ⁇ m.
- Example 2 Each oxide raw material is weighed so that the composition of Ni—Zn—Cu—Co ferrite becomes a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry is filtered and dried. A mixed powder was obtained. A calcined product obtained by calcining the raw material mixed powder at 870 ° C. for 3 hours was pulverized by a ball mill to obtain a Ni—Zn—Cu—Co ferrite powder according to the present invention.
- grooves having a depth of 20 ⁇ m were formed in a lattice shape at intervals of 3 mm using a blade shape having a U-shaped blade edge.
- the obtained green sheet was degreased at 400 ° C. and then sintered at 870 ° C. for 2 hours to obtain a Ni—Zn—Cu—Co ferrite sintered plate.
- the composition of the sintered ferrite plate is as follows: Fe 2 O 3 is 45.93 mol%, NiO is 24.91 mol%, ZnO is 15.03 mol%, CuO is 13.98 mol%, and CoO is 0.15 mol%.
- the thickness was 39 ⁇ m.
- a PET film was affixed to one surface of the obtained ferrite sintered plate, and a double-sided tape was affixed to the other surface to obtain a ferrite sintered sheet. The thickness was 59 ⁇ m.
- Example 3 Each oxide raw material is weighed so that the composition of Ni—Zn—Cu—Co ferrite becomes a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry is filtered and dried. A mixed powder was obtained. A calcined product obtained by calcining the raw material mixed powder at 810 ° C. for 3 hours was pulverized by a ball mill to obtain a Ni—Zn—Cu—Co ferrite powder according to the present invention.
- grooves having a depth of 50 ⁇ m were formed in a lattice shape at intervals of 3 mm using a blade shape having a V-shaped blade edge.
- the obtained green sheet was degreased at 400 ° C. and then sintered at 910 ° C. for 2 hours to obtain a Ni—Zn—Cu—Co ferrite sintered plate.
- the composition of the sintered ferrite plate is as follows: Fe 2 O 3 is 48.29 mol%, NiO is 11.26 mol%, ZnO is 29.43 mol%, CuO is 9.78 mol%, and CoO is 1.25 mol%.
- the thickness was 206 ⁇ m.
- a PET film was affixed to one surface of the obtained ferrite sintered plate, and a double-sided tape was affixed to the other surface to obtain a ferrite sintered sheet. The thickness was 249 ⁇ m.
- the ferrite sintered plate or the ferrite sintered sheet according to the present invention has a high ⁇ ′ and a low ⁇ ′′, so that it is optimal as a member for improving communication sensitivity.
- Examples 4-7 A ferrite sintered sheet was obtained in the same manner as in Example 1 except that the composition and the firing temperature were variously changed.
- Comparative Example 1 Each oxide raw material is weighed so that the composition of Ni—Zn—Cu ferrite becomes a predetermined composition, wet mixed using a ball mill for 20 hours, and then the mixed slurry is filtered and dried to obtain a raw material mixed powder.
- Ni—Zn—Cu ferrite powder 100 parts by weight of the obtained Ni—Zn—Cu ferrite powder, 8 parts by weight of polyvinyl butyral as a binder, 3 parts by weight of benzyl-n-butyl phthalate as a plasticizer, and 3 methyl-3methoxy-1-butanol as a solvent 50 After adding the weight part, it mixed well and obtained the slurry. This slurry was applied onto a PET film by a doctor blade type coater to form a coating film, and then dried to obtain a green sheet having a thickness of 203 ⁇ m.
- grooves having a depth of 80 ⁇ m were formed in a lattice pattern at intervals of 3 mm using a blade shape having a V-shaped blade edge.
- the obtained green sheet was degreased at 400 ° C. and then sintered at 900 ° C. for 2 hours to obtain a Ni—Zn—Cu ferrite sintered plate.
- the ferrite sintered plate had a composition of 48.02 mol% Fe 2 O 3 , 18.04 mol% NiO, 25.96 mol% ZnO, 7.98 mol% CuO, and a thickness of 172 ⁇ m.
- a PET film was affixed to one surface of the obtained ferrite sintered plate, and a double-sided tape was affixed to the other surface to obtain a ferrite sintered sheet. The thickness was 211 ⁇ m.
- Table 1 shows various properties of the sintered ferrite plates obtained in Examples 1 to 7 and Comparative Example 1.
- the ferrite sintered plate and ferrite sintered sheet according to the present invention have a large ⁇ ′ and a small ⁇ ′′, they are suitable as members for improving communication sensitivity in a system such as NFC.
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Abstract
Description
本発明において最も重要な点は、特定の組成のNi-Zn-Cu-Coフェライトからなるフェライト焼結板又はフェライト焼結シートは、μ′が高く、μ″が低いという事実である。
Ni-Zn-Cu-Coフェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を730℃で3時間焼成して得られた仮焼成物をボールミルで粉砕し、本発明に係るNi-Zn-Cu-Coフェライト粉末を得た。
得られたフェライト焼結板の一方の表面にPETフィルムを貼付し、もう一方の表面に両面テープを貼付してフェライト焼結シートを得た。厚さは390μmであった。
Ni-Zn-Cu-Coフェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を870℃で3時間焼成して得られた仮焼成物をボールミルで粉砕し、本発明に係るNi-Zn-Cu-Coフェライト粉末を得た。
得られたフェライト焼結板の一方の表面にPETフィルムを貼付し、もう一方の表面に両面テープを貼付してフェライト焼結シートを得た。厚さは59μmであった。
Ni-Zn-Cu-Coフェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を810℃で3時間焼成して得られた仮焼成物をボールミルで粉砕し、本発明に係るNi-Zn-Cu-Coフェライト粉末を得た。
得られたフェライト焼結板の一方の表面にPETフィルムを貼付し、もう一方の表面に両面テープを貼付してフェライト焼結シートを得た。厚さは249μmであった。
組成と焼成温度を種々変化させた以外は実施例1と同様にしてフェライト焼結シートを得た。
Ni-Zn-Cuフェライトの組成が、所定の組成になるように各酸化物原料を秤量し、ボールミルを用いて20時間湿式混合を行った後、混合スラリーを濾別・乾燥して原料混合粉末を得た。該原料混合粉末を780℃で3時間焼成して得られた仮焼成物をボールミルで粉砕し、Ni-Zn-Cuフェライト粉末を得た。
得られたフェライト焼結板の一方の表面にPETフィルムを貼付し、もう一方の表面に両面テープを貼付してフェライト焼結シートを得た。厚さは211μmであった。
Claims (6)
- 組成が酸化物換算で45~50mol%のFe2O3、10~25mol%のNiO、15~36mol%のZnO、2~14mol%のCuO、0.1~3.5mol%のCoOであることを特徴とするNi-Zn-Cu-Coフェライト焼結板。
- 請求項1記載のフェライト焼結板の一方の表面に粘着層を設け、反対側の表面に保護層を設けたフェライト焼結シート。
- 請求項1記載のフェライト焼結板の両面に粘着層を設けたフェライト焼結シート。
- 請求項1記載のフェライト焼結板の両面に保護層を設けたフェライト焼結シート。
- 請求項2~4のいずれかに記載のフェライト焼結シートにおいて、フェライト焼結板の少なくとも一方の表面に少なくとも1つの溝が形成されているフェライト焼結シート。
- 請求項2~4のいずれかに記載のフェライト焼結シートにおいて、フェライト焼結板が小片状に分割されているフェライト焼結シート。
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EP13850317.2A EP2916330B1 (en) | 2012-10-31 | 2013-10-29 | Ferrite sintered plate and ferrite sintered sheet |
US14/439,283 US9824802B2 (en) | 2012-10-31 | 2013-10-29 | Ferrite sintered plate and ferrite sintered sheet |
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