US1651958A - Insulation of finely-divided magnetic material - Google Patents

Insulation of finely-divided magnetic material Download PDF

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Publication number
US1651958A
US1651958A US158799A US15879927A US1651958A US 1651958 A US1651958 A US 1651958A US 158799 A US158799 A US 158799A US 15879927 A US15879927 A US 15879927A US 1651958 A US1651958 A US 1651958A
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United States
Prior art keywords
particles
insulation
magnetic
finely
oxide
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US158799A
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Homer H Lowry
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AT&T Corp
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Bell Telephone Laboratories Inc
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Priority to US158799A priority Critical patent/US1651958A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/90—Magnetic feature

Definitions

  • a core for a telephone loading coil, a plurality of these rings are stacked coaxially to form a complete core, as shown in Fig. 2, on which the usual toroidal wind-' ing is applied, the number of rings used de pending upon the existing electrical characteristics of the telephone circuit with which the loading coils are to be associated.
  • magnesium oxide-zinc oxide insulation may be employed in other forms of metallic structures which are subject to heat treatment after the insulation has been applied. Furthermore, the magnesium oxide-zinc oxide insulation may be employed in other forms of metallic structures which are subject to heat treatment after the insulation has been applied. Furthermore, the magnesium oxide-zinc oxide insulation may be employed in other forms of metallic structures which are subject to heat treatment after the insulation has been applied. Furthermore, the magnesium oxide-zinc oxide insulation may be employed in other forms of metallic structures which are subject to heat treatment after the insulation has been applied. Furthermore, the
  • a magnetic structure comprising an alloy' including nickel-iron in finely divided form, said alloy requiring heat treatment at a high temperature to improve the magnetic properties-of the core, and an adherent insulating coating on the particles consisting of magnesium oxide, zinc oxide and oxides of IllOkBl flIld lIOIl, sa1d coatlng retammg its inthe heattreatment.
  • a magnetic structure comprising an alloy containing nickel and iron in finely divided form, the particles being capable of passing through a sieve having 120 meshes per inch, and an adherent insulating coating on the particles comprising magnesium oxide and zinc oxide, the volume of theoxides being approximately 6% of the volume of the magnetic particlesand the volumes of the two oxides being substantially equal.
  • the method of producing magnetic structures which comprises coating magnetic particles with'a composition containmg magnesium hydroxide and zinc hydroxide and heating the coated particles to change the hydroxides to oxides.
  • netic particles with a mixture of magnesium hydroxide and zinc hydroxide heating said particles to change the hydroxides to adherent oxides, and subjecting the oxide coated particles to high pressures to form a homogeneous solid.
  • the method of producing magnetic structures which comprises coating particles of an alloy comprising nickel-iron with a mixture of magnesium hydroxide and zinc hydroxide, heating sai'd particles to convert the hydroxides to oxides, and subjecting a mass of oxide-coated particles to high pressure to combine the coated particles into a homogeneous solid.
  • the method of producing a magnetic core which comprises coating particles of an alloy comprising nickel and iron with a mixture of magnesium hydroxide and zinc hydroxide, heating said coated particles to form an adherent coating thereon of magnesium oxide and zinc oxlde, forming a mass of sa1d particles into a homogeneous solid under high pressure, and heat treating said solid to improve the magnetic properties of said nickel-iron alloy.

Description

Dec. 6, 1927. 1,651,958
H. H. LOWRY INSULATION OF FINBLY DIVIDED MAGNETIC MATERIAL Filed Jan.5, 1927 by i. 55W
Affamey 600 C. and the rings are thereafter cooled. sulatin g properties at the temperatures of During this heat treatment the zinc-oxide which is used as a flux for the magnesium oxide is partially dissociated and volatilized, the oxygen resulting from the dissociation combining with the magnetic particles to form a combination of nickel and iron oxide on the surfaces of the particles which further increases the insulation. The-high temperatures of the heat treatment do not a'p-' preciably affect the insulating properties of the magnesium oxide coating, this being stable within the range of the heat treating temperatures. For a detailed account of heat treatments employed with nickel iron alloys, reference is made to patents to G. W.
Elmen Nos. 1,586,884 and 1,586,889.
When a core is to be made, in accordance with this invention, for a telephone loading coil, a plurality of these rings are stacked coaxially to form a complete core, as shown in Fig. 2, on which the usual toroidal wind-' ing is applied, the number of rings used de pending upon the existing electrical characteristics of the telephone circuit with which the loading coils are to be associated.
While the invention has been described with respect to the insulation of magnetic dust which is subject to a heat treatment to improve the magnetic properties of the magnetic material, the invention is not limited tothis particular aspect. The magnesium oxide-zinc oxide insulation may be employed in other forms of metallic structures which are subject to heat treatment after the insulation has been applied. Furthermore, the
specific proportions of the oxides may be varied, depending on the properties of the memagnesium oxide and zinc oxide.
3. A magnetic structure comprising an alloy' including nickel-iron in finely divided form, said alloy requiring heat treatment at a high temperature to improve the magnetic properties-of the core, and an adherent insulating coating on the particles consisting of magnesium oxide, zinc oxide and oxides of IllOkBl flIld lIOIl, sa1d coatlng retammg its inthe heattreatment.
4. A magnetic structure comprising an alloy containing nickel and iron in finely divided form, the particles being capable of passing through a sieve having 120 meshes per inch, and an adherent insulating coating on the particles comprising magnesium oxide and zinc oxide, the volume of theoxides being approximately 6% of the volume of the magnetic particlesand the volumes of the two oxides being substantially equal.
5. The method of producing magnetic structures, which comprises coating magnetic particles with'a composition containmg magnesium hydroxide and zinc hydroxide and heating the coated particles to change the hydroxides to oxides.
6. The method of producing magnetic structures, which comprises coating mag-.
netic particles with a mixture of magnesium hydroxide and zinc hydroxide, heating said particles to change the hydroxides to adherent oxides, and subjecting the oxide coated particles to high pressures to form a homogeneous solid.
7. The method of producing magnetic structures, which comprises coating particles of an alloy comprising nickel-iron with a mixture of magnesium hydroxide and zinc hydroxide, heating sai'd particles to convert the hydroxides to oxides, and subjecting a mass of oxide-coated particles to high pressure to combine the coated particles into a homogeneous solid.
8. The method of insulating nickel-iron alloy in a finely 'divided state, which comprises mixin a mass of alloy particles with magnesium. ydroxide and zinc h droxide, the total volume of the hydroxide eing approximately 6% of the volume of the alloy mass, to form a coating on the particles, and heating the mixture to change the hydroxides to oxides.
9. The method of producing a magnetic core, which comprises coating particles of an alloy comprising nickel and iron with a mixture of magnesium hydroxide and zinc hydroxide, heating said coated particles to form an adherent coating thereon of magnesium oxide and zinc oxlde, forming a mass of sa1d particles into a homogeneous solid under high pressure, and heat treating said solid to improve the magnetic properties of said nickel-iron alloy.
In witness whereof, I'hereunto subscribe my name this 30th day of December, A. D.,
,HOMER H. LownY.
US158799A 1927-01-03 1927-01-03 Insulation of finely-divided magnetic material Expired - Lifetime US1651958A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156650A (en) * 1960-11-17 1964-11-10 Gen Electric Oxide coated iron-cobalt alloy magnetic material
US4543197A (en) * 1982-04-27 1985-09-24 Japan Metals & Chemicals Co., Ltd. Process for producing magnetic metallic oxide
US4919734A (en) * 1984-09-29 1990-04-24 Kabushiki Kaisha Toshiba Compressed magnetic powder core
US20060124464A1 (en) * 2003-02-05 2006-06-15 Corporation Imfine Inc. High performance magnetic composite for ac applications and a process for manufacturing the same
US20080267806A1 (en) * 2006-08-02 2008-10-30 Kabushiki Kaisha Toshiba Method of manufacturing high frequency magnetic material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3156650A (en) * 1960-11-17 1964-11-10 Gen Electric Oxide coated iron-cobalt alloy magnetic material
US4543197A (en) * 1982-04-27 1985-09-24 Japan Metals & Chemicals Co., Ltd. Process for producing magnetic metallic oxide
US4919734A (en) * 1984-09-29 1990-04-24 Kabushiki Kaisha Toshiba Compressed magnetic powder core
US20060124464A1 (en) * 2003-02-05 2006-06-15 Corporation Imfine Inc. High performance magnetic composite for ac applications and a process for manufacturing the same
US7510766B2 (en) * 2003-02-05 2009-03-31 Corporation Imfine Inc. High performance magnetic composite for AC applications and a process for manufacturing the same
US20080267806A1 (en) * 2006-08-02 2008-10-30 Kabushiki Kaisha Toshiba Method of manufacturing high frequency magnetic material
US7763094B2 (en) * 2006-08-02 2010-07-27 Kabushiki Kaisha Toshiba Method of manufacturing high frequency magnetic material

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