GB927289A - Improvements relating to permanent magnets - Google Patents

Improvements relating to permanent magnets

Info

Publication number
GB927289A
GB927289A GB3268559A GB3268559A GB927289A GB 927289 A GB927289 A GB 927289A GB 3268559 A GB3268559 A GB 3268559A GB 3268559 A GB3268559 A GB 3268559A GB 927289 A GB927289 A GB 927289A
Authority
GB
United Kingdom
Prior art keywords
phase
particles
heat treatment
magnet
tetragonal
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
Application number
GB3268559A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB927289A publication Critical patent/GB927289A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C28/00—Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00
    • 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
    • H01F1/04—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 metals or alloys
    • 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
    • H01F1/04—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 metals or alloys
    • H01F1/06—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 metals or alloys in the form of particles, e.g. powder

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

A permanent magnet has as a constituent a phase which has been produced by a thermal treatment and which contains at least 60% Mn with the remainder substantially Al, the phase having a tetragonal crystal structure with an axes ratio c/a of >1 and <2. An example of this phase is that occurring in a binary Mn-Al alloy (Mn: Al atom ratio 5:4) and having the required structure with an axes ratio about 1.3 and an occupation of the lattice points 0, 0, 0 and 1/2 , \ba1/2 , \ba1/2 with a preference of the Mn atoms for one of these points. The Mn-Al alloy may be heat-treated to obtain the tetragonal phase by either (1) heating at a temperature below 1000 DEG C. for a sufficient time, or (2) cooling between 825 DEG and 600 DEG C. at a rate of 0.5-100 DEG C./second, or (3) cooling to below 825 DEG C. at a rate of more than 100 DEG C./second and then heating between 825 DEG and 600 DEG C. for a sufficient time. Homogenization before and annealing at 200-600 DEG C. after the phase-production heat treatment is beneficial. Particles for the production of the magnet may be produced by either (1) effecting solid state diffusion of powders of the constituent metals or pre-alloys thereof or (2) pulverizing a cast or sintered Mn-Al body with or without a prior heat treatment so that the brittle b phase is obtained. The particles are then heat-treated to produce the tetragonal phase. Alternatively the body may be pulverized after the phase-production heat treatment. The particles are formed into a magnet by compression with or without sintering; they may be oriented in a magnetic field before or during compression. Specification 771,538 is referred to.
GB3268559A 1958-09-30 1959-09-25 Improvements relating to permanent magnets Expired GB927289A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL231826 1958-09-30

Publications (1)

Publication Number Publication Date
GB927289A true GB927289A (en) 1963-05-29

Family

ID=19751365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3268559A Expired GB927289A (en) 1958-09-30 1959-09-25 Improvements relating to permanent magnets

Country Status (3)

Country Link
CH (1) CH410215A (en)
ES (1) ES252340A1 (en)
GB (1) GB927289A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122220A (en) * 1982-04-23 1984-01-11 Wolfen Filmfab Veb Powder for magnetic recording materials
US11441218B2 (en) 2017-01-05 2022-09-13 Tdk Corporation MnAl alloy and production method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122220A (en) * 1982-04-23 1984-01-11 Wolfen Filmfab Veb Powder for magnetic recording materials
US11441218B2 (en) 2017-01-05 2022-09-13 Tdk Corporation MnAl alloy and production method thereof

Also Published As

Publication number Publication date
ES252340A1 (en) 1960-03-16
CH410215A (en) 1966-03-31

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