WO2017141974A1 - Corps fritté de ferrite, et noyau de ferrite - Google Patents

Corps fritté de ferrite, et noyau de ferrite Download PDF

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Publication number
WO2017141974A1
WO2017141974A1 PCT/JP2017/005546 JP2017005546W WO2017141974A1 WO 2017141974 A1 WO2017141974 A1 WO 2017141974A1 JP 2017005546 W JP2017005546 W JP 2017005546W WO 2017141974 A1 WO2017141974 A1 WO 2017141974A1
Authority
WO
WIPO (PCT)
Prior art keywords
sintered body
ferrite
mol
ferrite sintered
nio
Prior art date
Application number
PCT/JP2017/005546
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English (en)
Japanese (ja)
Inventor
健一 木内
田中　一満
譲二 芦川
浩二 窪田
Original Assignee
Tdk株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tdk株式会社 filed Critical Tdk株式会社
Publication of WO2017141974A1 publication Critical patent/WO2017141974A1/fr

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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets

Definitions

  • the present invention relates to a ferrite sintered body and a ferrite core.
  • Ferrite sintered bodies are widely used in electronic parts such as inductors, power transformers, and electromagnetic filters.
  • a ferrite sintered body forming a core (magnetic core) in these electronic components is called a ferrite core (see Patent Documents 1 and 2).
  • An inductor is used for an LC resonance circuit in a sensing device that requires high accuracy.
  • the magnetic characteristics of the ferrite core also vary with changes in the outside air temperature, so it is difficult to maintain accuracy over a wide temperature range.
  • the ferrite surface needs to have an insulating property, and the specific resistance is required to be 1 ⁇ 10 9 ⁇ ⁇ cm or more. It was difficult to use.
  • an insulation process such as providing an insulating layer as a base is required.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide a ferrite sintered body and a ferrite core that have a small variation in magnetic permeability and a large specific resistance in a wide temperature range.
  • the ferrite sintered body of the present invention contains 47 to 49 mol% Fe 2 O 3 , 28 to 31 mol% NiO, 20 to 25 mol% ZnO, has a C content of 0.003 mass% or less, and contains S Is 0.015 mass% or less, and the total amount of Fe 2 O 3 , NiO, and ZnO is 99.8 mol% or more.
  • the ferrite core of the present invention contains 47 to 49 mol% Fe 2 O 3 , 28 to 31 mol% NiO, 20 to 25 mol% ZnO, has a C content of 0.003 mass% or less, and contains S Is 0.015 mass% or less, and the total amount of Fe 2 O 3 , NiO, and ZnO is 99.8 mol% or more.
  • a ferrite sintered body and a ferrite core that have a small variation in magnetic permeability over a wide temperature range and a large specific resistance.
  • the ferrite sintered body of the present embodiment contains 47 to 49 mol% Fe 2 O 3 , 28 to 31 mol% NiO, 20 to 25 mol% ZnO, and the content of C is 0.003 mass% or less, The S content is 0.015% by mass or less, and the total amount of Fe 2 O 3 , NiO, and ZnO is 99.8 mol% or more.
  • Such a ferrite sintered body has a small variation in magnetic permeability over a wide temperature range and a large specific resistance.
  • the total amount of Fe 2 O 3 , NiO, and ZnO is 99.8 mol% or more.
  • the total amount is preferably 99.9 mol% or more.
  • the content of C is 0.003% by mass or less.
  • the C content is preferably 0.001 to 0.002% by mass, and it is possible to substantially not contain C.
  • the content of S is 0.015% by mass or less.
  • the content of S is preferably 0.005 to 0.010 mass%, and S can be substantially not included.
  • substantially not contained means that it is less than the detection limit value in the measurement by the combustion method.
  • the ferrite sintered body of the present embodiment may not substantially contain components other than Fe 2 O 3 , NiO, and ZnO.
  • the ferrite sintered body preferably has a temperature coefficient of permeability (relative permeability) at ⁇ 20 ° C. to 120 ° C. of 25 ppm / K or less, more preferably 20 ppm / K or less, and 10 ppm / K or less. More preferably.
  • a temperature coefficient of permeability at ⁇ 20 ° C. to 120 ° C. is in the above range, the ferrite sintered body is not easily affected by fluctuations in the outside air temperature when used in sensing devices that require high accuracy, and has a wide temperature range. High-precision sensing performance can be obtained.
  • the temperature coefficient of the permeability means a value obtained by dividing the difference between the maximum value and the minimum value of the permeability in a certain temperature region by the temperature change.
  • the magnetic permeability is a value measured at a frequency of 1 MHz with an impedance analyzer, for example.
  • the temperature coefficient of magnetic permeability (relative magnetic permeability) can be 5 ppm / K or less, and can also be 3 ppm / K or less.
  • the ferrite sintered body has an electric resistance value (specific resistance) of preferably 1 ⁇ 10 9 ⁇ ⁇ cm or more, and more preferably 1 ⁇ 10 10 ⁇ ⁇ cm or more. If the electrical resistance value (specific resistance) of the ferrite sintered body is in the above range, no insulation treatment is required during use.
  • the sintered density of the ferrite sintered body is preferably 5.3 to 5.5 g / cm 3 . Such a density is preferable because the void generation rate is small and the variation in magnetic permeability due to external factors (temperature, humidity, pressure) tends to be small.
  • the ferrite sintered body of the present embodiment may contain Fe alone or an oxide of Cd, Co, Cu, Pb, Si, or Mn as an inevitable impurity.
  • the total amount of inevitable impurities in the ferrite sintered body is preferably less than 300 mol ppm, and it is preferable that these impurities are not substantially contained.
  • the manufacturing method of the ferrite sintered compact in this embodiment is demonstrated.
  • the Fe 2 O 3 raw material, the NiO raw material, and the ZnO raw material are mixed at a composition ratio such that the content of Fe 2 O 3 , NiO, and ZnO in the ferrite sintered body is in the above range to obtain a raw material powder.
  • the Fe 2 O 3 raw material include Fe 2 O 3 powder and Fe 3 O 4 powder.
  • the NiO raw material include NiO powder.
  • the ZnO raw material include ZnO powder.
  • the average particle diameter of the Fe 2 O 3 raw material, NiO raw material, and ZnO raw material is preferably 0.1 to 10 ⁇ m.
  • the purity of the Fe 2 O 3 raw material, NiO raw material, and ZnO raw material is preferably 100 to 1000 ppm by mass of metal impurities.
  • the impurities include Cd, Co, Cu, Pb, Si, or Mn.
  • the mixing method may be wet or dry, but is preferably dry from the viewpoint of preventing impurities from remaining.
  • the raw material powder is temporarily fired to obtain a temporarily fired product.
  • the calcination is preferably performed in air under conditions of a calcination temperature of 800 to 1200 ° C. and a calcination time of 2 to 50 hours.
  • the calcination product is pulverized.
  • the ground calcined product is molded to obtain a molded body.
  • the pressure during molding is preferably 50 to 500 MPa.
  • the atmosphere during pre-firing may be a (N 2 + O 2 ) mixed gas having an oxygen content of 1 to 50% by volume.
  • the molded body does not contain a binder.
  • a molded object does not contain a binder substantially, it can suppress that a void generate
  • the content of C and S in the ferrite sintered body can be within the above range.
  • a molded object does not contain CuO substantially. When CuO is not substantially contained, generation of voids in the molded body during the main firing can be suppressed, and the temperature coefficient of permeability can be further improved.
  • the obtained molded body is subjected to main firing to obtain a ferrite sintered body.
  • the main calcination is preferably performed in air under conditions of a main calcination temperature of 1000 to 1500 ° C. and a main calcination time of 2 to 50 hours.
  • the atmosphere for the main firing may be a (N 2 + O 2 ) mixed gas having an oxygen amount of 1 to 50% by volume. In some cases, H 2 may be introduced.
  • the obtained sintered body is cut or polished to obtain a ferrite core having a predetermined shape.
  • a shape of a ferrite core It can be set as rod shape, plate shape, etc.
  • the ferrite core of this embodiment has a small variation in permeability and a low specific resistance over a wide temperature range. Therefore, it can be suitably used for an LC resonance circuit in a sensing device that requires high accuracy without performing insulation treatment or the like.
  • Fe 2 O 3 powder having a purity of 99.9% by mass and an average particle size of 0.5 ⁇ m, NiO powder, ZnO powder and CuO powder were mixed at the composition ratio shown in Table 1 to obtain a raw material powder.
  • the raw material powder was calcined at 1100 ° C. for 20 hours.
  • the obtained temporary fired body was pulverized and molded under the conditions shown in Table 1 (presence / absence of binder, molding method).
  • the forming method A means CIP (cold isostatic pressing)
  • the forming method B means uniaxial press.
  • the obtained molded body was subjected to main firing at 1350 ° C. for 20 hours to obtain a sintered body.
  • the obtained sintered body was cut, and a ring-shaped magnetic permeability evaluation sample having an outer diameter of 11 mm, an inner diameter of 6 mm, and a thickness of 2 mm, and a square shape having a length of 55 mm, a width of 14 mm, and a thickness of 4 mm.
  • a sample for evaluating the specific resistance was obtained.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Ceramics (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Le corps fritté de ferrite de l'invention contient 47 à 49% en moles de Ｆｅ２Ｏ３, 28 à 31% en moles de NiO et 20 à 25% en moles de ZnO. La teneur en C est inférieure ou égale à 0,003% en masse, la teneur en S est inférieure ou égale à 0,015% en masse, et la quantité totale de Ｆｅ２Ｏ３, ＮｉＯ et ＺｎＯ est supérieure ou égale à 99,8% en moles.
PCT/JP2017/005546 2016-02-18 2017-02-15 Corps fritté de ferrite, et noyau de ferrite WO2017141974A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-028689 2016-02-18
JP2016028689A JP2017145177A (ja) 2016-02-18 2016-02-18 フェライト焼結体、及びフェライトコア

Publications (1)

Publication Number Publication Date
WO2017141974A1 true WO2017141974A1 (fr) 2017-08-24

Family

ID=59626044

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/005546 WO2017141974A1 (fr) 2016-02-18 2017-02-15 Corps fritté de ferrite, et noyau de ferrite

Country Status (2)

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JP (1) JP2017145177A (fr)
WO (1) WO2017141974A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000327411A (ja) * 1999-05-21 2000-11-28 Kawasaki Steel Corp Ｎｉ−Ｚｎ系フェライトの製造方法
JP2002198213A (ja) * 2000-12-25 2002-07-12 Tdk Corp 低温焼成高性能フェライト材料及びフェライト部品
JP2008230941A (ja) * 2007-03-23 2008-10-02 Nec Tokin Corp 高周波パワーデバイス用低損失Ｎｉ−Ｃｕ−Ｚｎ系フェライト
JP2011018913A (ja) * 2007-02-07 2011-01-27 Hitachi Metals Ltd 電子部品及びｄｃ／ｄｃコンバータ
JP2015078088A (ja) * 2013-10-16 2015-04-23 Tdk株式会社 フェライト組成物および電子部品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000327411A (ja) * 1999-05-21 2000-11-28 Kawasaki Steel Corp Ｎｉ−Ｚｎ系フェライトの製造方法
JP2002198213A (ja) * 2000-12-25 2002-07-12 Tdk Corp 低温焼成高性能フェライト材料及びフェライト部品
JP2011018913A (ja) * 2007-02-07 2011-01-27 Hitachi Metals Ltd 電子部品及びｄｃ／ｄｃコンバータ
JP2008230941A (ja) * 2007-03-23 2008-10-02 Nec Tokin Corp 高周波パワーデバイス用低損失Ｎｉ−Ｃｕ−Ｚｎ系フェライト
JP2015078088A (ja) * 2013-10-16 2015-04-23 Tdk株式会社 フェライト組成物および電子部品

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