US2534178A - Manufacture of permanent magnets - Google Patents

Manufacture of permanent magnets Download PDF

Info

Publication number
US2534178A
US2534178A US727296A US72729647A US2534178A US 2534178 A US2534178 A US 2534178A US 727296 A US727296 A US 727296A US 72729647 A US72729647 A US 72729647A US 2534178 A US2534178 A US 2534178A
Authority
US
United States
Prior art keywords
permanent magnets
treatment
magnets
manufacture
magnet
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US727296A
Other languages
English (en)
Inventor
Marquaire Charles
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
D'ELECTIRO-CHIMIE D'ELECTRO-METALLURGIE ET DES ACIERIES ELECTRIQUES D'UGINE Ste
ELECTIRO CHIMIE D ELECTRO META
Original Assignee
ELECTIRO CHIMIE D ELECTRO META
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 ELECTIRO CHIMIE D ELECTRO META filed Critical ELECTIRO CHIMIE D ELECTRO META
Application granted granted Critical
Publication of US2534178A publication Critical patent/US2534178A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H01F41/0253—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 for manufacturing permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/14—Treatment of metallic powder
    • B22F1/142—Thermal or thermo-mechanical treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • 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
    • H01F41/0253—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 for manufacturing permanent magnets
    • H01F41/0266—Moulding; Pressing
    • 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
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/58—Processes of forming magnets

Definitions

  • the soobtained magnets sometimes show av certain brittleness, particularly when the magnetic pieces are provided with sharp angles.
  • the present-invention has"for its objectto'provide a method which makes it -possibleto considerably improve the-mechanical resistance of magnets obtained by the above mentioned methods without substantiallyreducingitheir magnetic features or evenwhile increasing the. latter.
  • said method consists in causing the magnet to undergo, during the agglomeration operation or after the latterya heating in aneutral'or reducing atmosphere to a temperature around 300- to 450C;
  • Example II A similar magnet underwent a heat-treatment at 350 C. during one hour in an atmosphere of wet hydrogen; the modifications were the follow- 3:
  • Traction strength was multiplied by 3.9. Shear strength of the angles was multiplied by 5.3. Dimensions of the magnet were reduced by 2.5 per cent.
  • Example III A similar magnet was heated during one hour at 395 C. in an atmosphere of wet hydrogen; the modifications were the following;
  • Example IV A similar magnet was heated during one hour at 450 C. in an atmosphere of wet hydrogen; the modifications were the following:
  • Example V max. BH a pparent Br Hc max. BH BIXHC density before treatment 7, 070 513 L54 10 6 0.425 4.45 after treatment... 8, 100 355 l. 3l 10 6 0. 456 4. 48
  • Example VI T similar magnet was heated during one hour at 480 C. in hydrogen; it underwent the following modifications:
  • magnets treated according to the above described method may advantageously be used in the manufacture of modern type electricity meters because of their magnetic features as well as of their mechanical properties and may be placed among the best magnets available for wide sale meters.
  • the method makes it possible to manufacture magnets of the small air-gap type without any polar masses or field closing plates, said type being frequently used in the manufacture of meters.
  • the step consisting in heating said permanent magnets in a non-oxidizing atmosphere within the range of about 300 C.-480 C. at such temperature as increases the remanent induction,.decreases the coercive force and at least maintains the product of both said factors.
  • the step consisting in heating said permanent magnets in a reducing atmosphere within the range of about 300 C.-480 C. at such temperature as increases the remanent induction, decreases the coercive force and at least maintains the product of both said factors.
  • the step consisting in heating said permanent magnets in a non-oxidizing atmosphere during agglomeration, said heating being within the range of about 300 C.-480 C. at such temperature as increases the remanent induction, decreases the coercive force and at least maintains the product of both said factors.
  • the step consisting in heating said permanent magnets in a non-oxidizing atmosphere after agglomeration, said heating being within the range of about 300 C.-480 C. at such temperature as increases the remanent induction, decreases the coercive force and at least maintains the product of both said factors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
US727296A 1946-02-15 1947-02-07 Manufacture of permanent magnets Expired - Lifetime US2534178A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR260191X 1946-02-15

Publications (1)

Publication Number Publication Date
US2534178A true US2534178A (en) 1950-12-12

Family

ID=8884959

Family Applications (1)

Application Number Title Priority Date Filing Date
US727296A Expired - Lifetime US2534178A (en) 1946-02-15 1947-02-07 Manufacture of permanent magnets

Country Status (5)

Country Link
US (1) US2534178A (en, 2012)
CH (1) CH260191A (en, 2012)
DE (1) DE886012C (en, 2012)
GB (1) GB612879A (en, 2012)
NL (1) NL72478C (en, 2012)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116181A (en) * 1958-09-30 1963-12-31 Philips Corp Permanent amgnets
US3138494A (en) * 1961-05-01 1964-06-23 Allegheny Ludlum Steel Method of annealing magnetic materials
US3147112A (en) * 1961-01-19 1964-09-01 Du Pont Ferromagnetic mn-ga alloy and method of production

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1068394B (en, 2012) * 1959-11-05

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669643A (en) * 1926-04-17 1928-05-15 Western Electric Co Magnetic material
US1840352A (en) * 1931-01-22 1932-01-12 Bell Telephone Labor Inc Process of producing magnetic bodies
US1859067A (en) * 1927-10-29 1932-05-17 Western Electric Co Method of producing magnetic materials
US2298885A (en) * 1941-05-29 1942-10-13 Gen Electric Method for producing high density sintered products
GB590392A (en) * 1942-04-07 1947-07-16 Electro Chimie Metal Improvements in or relating to the manufacture of magnets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669643A (en) * 1926-04-17 1928-05-15 Western Electric Co Magnetic material
US1859067A (en) * 1927-10-29 1932-05-17 Western Electric Co Method of producing magnetic materials
US1840352A (en) * 1931-01-22 1932-01-12 Bell Telephone Labor Inc Process of producing magnetic bodies
US2298885A (en) * 1941-05-29 1942-10-13 Gen Electric Method for producing high density sintered products
GB590392A (en) * 1942-04-07 1947-07-16 Electro Chimie Metal Improvements in or relating to the manufacture of magnets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3116181A (en) * 1958-09-30 1963-12-31 Philips Corp Permanent amgnets
US3147112A (en) * 1961-01-19 1964-09-01 Du Pont Ferromagnetic mn-ga alloy and method of production
US3138494A (en) * 1961-05-01 1964-06-23 Allegheny Ludlum Steel Method of annealing magnetic materials

Also Published As

Publication number Publication date
GB612879A (en) 1948-11-18
DE886012C (de)
CH260191A (fr) 1949-02-28
NL72478C (en, 2012)

Similar Documents

Publication Publication Date Title
KR101060091B1 (ko) 자심의 제조방법과, 자심 및 자심을 지닌 유도소자
US4171978A (en) Iron/chromium/cobalt-base spinodal decomposition-type magnetic (hard or semi-hard) alloy
US8298352B2 (en) Method for the production of magnet cores, magnet core and inductive component with a magnet core
CN103310937B (zh) 一种高饱和磁感应强度铁钴基纳米晶软磁粉芯及其制备方法
US2864734A (en) Magnetic flake core and method of
US2534178A (en) Manufacture of permanent magnets
US3116181A (en) Permanent amgnets
Hojo et al. Dust core with low core-loss for high-frequency applications
JPH1070023A (ja) 永久磁石とその製造方法
Tsurin et al. A Mössbauer study of the structural characteristics of equiatomic FePd and FePt alloys
CN108335897B (zh) 一种NdCeFeB各向同性致密永磁体及其制备方法
JPS63115309A (ja) 磁性合金粉末
US1818054A (en) Magnetic material
US2961360A (en) Magnets having one easy direction of magnetization
US2999778A (en) Antimonide coated magnetic materials with lead and lead-antimony matrices
DE69102277T2 (de) Behandlung von magnetpulvermaterialien und so erhaltene gegenstände.
CN112466651B (zh) 一种无稀土高性能复合磁体的制备方法
Vetcher et al. Iron powders with insulating layers: structure and magnetic properties
US3034935A (en) Alloy bodies having improved magnetic properties and process for producing same
DE102014004513A1 (de) Verfahren zur Herstellung eines Magneten auf RFeB-Basis
US1759612A (en) Method of producing magnetic bodies
US1904859A (en) Ferrous alloy
Cooter et al. Cunife wire magnets of small size
US1845144A (en) Method of making magnetic structures
JPS5953683B2 (ja) 電磁鉄心の製作方法