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
  • H01F1/032—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
• • 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
  • H01F1/08—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 pressed, sintered, or bound together
  • H01F1/083—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 pressed, sintered, or bound together in a bonding agent

Definitions

• the invention is based on the new discovery that permanent magnets of pressed finely divided material with or without the assistance of a binding agent can be given the most variable prop- 10 agent is not used it has been usual to press the erties by employing instead of a single finely l0 finely divided material in a shell of non-magdivided permanent magnetic material, two or netizable material. more such materials of different compositions.
• Permanent magnets of the type above described Both magnetic indices and other properties such have been found even with the employment of as temperature stability and the like may be high pressures in the pressing operation (4 tons usefully modified by alteration of the percentage 15 per square centimetre or over) to have a density proportions of the ingredients of the mixture.
• the curve heat treatment should be carried out ijor one or fullness factor as expressed by the equation (more. materials in order to bring nearer together BHmax the values for the coercive forces.
• the heat B H treatment consists either in heating and quenching or in the case of precipitation hardenable in comparison with the coherent material 18 alloys, to bring about precipitation hardening in lowered on an average to the extent of about any suitable manner 30%.
• the separate materials 2 may, for example, have different temperature stabilities. If then a constituent of lower temperature stability be mixed with a constituent which has the property of temperature stability in a high degree, a pressed magnet is obtained which has a temperature stability which lies between the temperature stability properties of both constituents.
• the value may be advantageously influenced by the mixture proportions selected.
• the pressed permanent magnet so obtained shows the following V8.1l1BS1-3r about 4,450 gauss; He about 500 oersted; a about 0.31;
• nickel-aluminium-iron for permanent magnetic alloys
• materials can also be mixed which have alower coercive force, for example, 275 oersted in which the remanence comes to 10,000gauss. This is the case with cobalt-molybdenum-iron permanent magnetic alloys.
• it is necessary to modify the coercive force of the latter by a special heat treatment consisting of heating and quenching, so that it also has close upon 275 oersted. In consequence of this heat treatment, the magnetic material has a remanence of 8,000 to 8,500 gauss.
• the curve fullness factor n for the heat treated nickel-aluminium-iron material comes to 0.5-0.6. with a mixing proportion of 1:1 the above mentioned material gives a permanent magnet with the following valuesz-B: 5550 gauss; He 275 oersted; 1 0.36;
• Carbon chromium cobalt iron permanent magnetic alloys and cobalt-molybdenum-iron alloys have with suitable composition mainly the same magnetic indices, for example, both alloys have a coercive force of about 275 oersted, a
• Carbon-chromium-cobalt-iron alloys have the undesired property of being sensitive to temperature influences while the precipitation hardenable perwere not suitable on account of space and reasons of construction.
• Permanent magnets consisting of compressed finely divided magnetic metal alloys, the finely divided material consisting of a mixture of a plurality of different permanent magnetic metal alloys in the finely divided state, the difierence between the coercive forces of which is not substantially greater than 20%.
• Permanent magnets consisting of com so pressed finely divided magnetic metal alloys, the finely divided material consisting of a mixture of a plurality of different permanent magnetic metal alloys in the finely divided state, wherein a part of the permanent magnetic materials has' a high remanence and high curve fullness factor ands part has a low remanenceand low curve fullness factor, both parts having approximately the same coercive force, the diiference between the coercive forces being not substantially greater than 20%.
• Permanent magnets consisting of compressed finely divided magnetic metal alloys, the finely divided material consisting of a mixture of a plurality of different permanent magnetic metal alloys, wherein the permanent magnetic materials have the same coercive force and remanence, but differ from each other in their sensitivity to temperature infiuences.
• a process for the preparation of finely divided permanent magnetic metal alloys for the production of permanent magnets by pressure characterized in that a plurality of permanent magnetic metal alloys of differing coercive forces are employed, wherein before mixing one or more of the constituent materials is submitted to a" heat treatment for the purpose of equalising the coercive forces, the said heat treatment consisting of heating and quenching the material; and thereafter the constituents are intimately mixed together.
• a process for the preparation of finely divided permanent magnetic metal alloys for the production of permanent magnets by pressure characterized in that a plurality of permanent magnetic metal alloys of differing coercive forces are employed, wherein before mixing one or more of the constituent materials is submitted to a heat treatment for the purpose of equalising the coercive forces, the said heat treatment consisting in a precipitation hardening process; and thereafter the constituents are intimately mixed together.
• a process for the preparation of finely divided permanent magnetic metal alloys for the production of permanent magnets by pressure characterized in that a plurality of permanent magnetic metal alloys of differing coercive forces are employed, wherein before mixing one or more of the constituent materials is submitted to a heat treatment for the purpose of equalling the coercive forces, and thereafter the constitucuts are intimately mixed together.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Hard Magnetic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=7985778

Family Applications (1)

Country Status (5)

Cited By (3)

• 1936
  • 1936-10-10 CH CH193452D patent/CH193452A/de unknown
  • 1936-10-13 AT AT150915D patent/AT150915B/de active
  • 1936-10-28 FR FR812593D patent/FR812593A/fr not_active Expired
  • 1936-11-07 US US109683A patent/US2118285A/en not_active Expired - Lifetime
  • 1936-11-07 GB GB30402/36A patent/GB469356A/en not_active Expired

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