GB781633A - Improvements in the manufacture of permanent magnets from sintered mixtures of oxides - Google Patents

Improvements in the manufacture of permanent magnets from sintered mixtures of oxides

Info

Publication number
GB781633A
GB781633A GB25969/55A GB2596955A GB781633A GB 781633 A GB781633 A GB 781633A GB 25969/55 A GB25969/55 A GB 25969/55A GB 2596955 A GB2596955 A GB 2596955A GB 781633 A GB781633 A GB 781633A
Authority
GB
United Kingdom
Prior art keywords
magnetic
mixture
plate
oxides
post
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
GB25969/55A
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.)
Audax Industries SA
Original Assignee
Audax Industries SA
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 Audax Industries SA filed Critical Audax Industries SA
Publication of GB781633A publication Critical patent/GB781633A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

781,633. Moulding magnets. SOC. AUDAX. Sept. 12, 1955 [Nov. 9, 1954; May 23, 1955], No. 25969/55. Class 87(2). [Also in Group XXXV] In making an annular permanent magnet with radial grain orientation as shown in Fig. 1, a sintered mixture of oxides of iron, of chromium and of an alkaline earth metal such as barium' or of lead is powdered, mixed with water and placed in an annular mould formed by the space between magnetic ring 6 and pole 7. The water is extracted through holes 9 covered with a filter cloth in a non-magnetic plate 8 forming the base of the mould, space 11 between plate 8 and non- magnetic dished plate 10, and passage 13 through magnetic post 2, to which is connected a vacuum pump. Pressure is applied through non-magnetic piston 28. The grains are orientated in the liquid phase by a radial magnetic field developed by coil 1 and passing through a magnetic circuit comprising post 2, base 4, cylinder 3, lid 5, ring 6 and the oxide mixture. After its removal with members 6, 7 the mixture is partially dried, this assembly is replaced and the mixture again compressed. A suitable apparatus for producing parallel grain orientation in a pressed magnet having the shape of a parallel piped or disc is described, Figs. 3, 4 (not shown) Specification 708,127 [Group XXXV] is referred to.
GB25969/55A 1954-11-09 1955-09-12 Improvements in the manufacture of permanent magnets from sintered mixtures of oxides Expired GB781633A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1114010T 1954-11-09

Publications (1)

Publication Number Publication Date
GB781633A true GB781633A (en) 1957-08-21

Family

ID=9628086

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25969/55A Expired GB781633A (en) 1954-11-09 1955-09-12 Improvements in the manufacture of permanent magnets from sintered mixtures of oxides

Country Status (3)

Country Link
US (1) US2828264A (en)
FR (2) FR1114010A (en)
GB (1) GB781633A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES230262A1 (en) * 1955-08-10 1957-03-01 Philips Nv Ferromagnetic material
LU34570A1 (en) * 1955-08-10
NL88282C (en) * 1955-08-10 1958-05-16
US2980617A (en) * 1956-03-13 1961-04-18 Indiana General Corp Ferrite compositions and method of making same
US3023166A (en) * 1956-08-18 1962-02-27 Philips Corp Magnetic record carrier
DE1283730B (en) * 1963-12-23 1969-02-20 Siemens Ag Device for the production of molded bodies which are subjected to sintering
US5945028A (en) * 1992-04-24 1999-08-31 Tdk Corporation Hexagonal system ferrite particles and their production process
US5648039A (en) * 1992-04-24 1997-07-15 Tdk Corporation Process for the production of anisotropic ferrite magnets

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1997193A (en) * 1930-12-25 1935-04-09 Mitsubishi Electric Corp Permanent magnet and method of manufacturing same
NL75788C (en) * 1947-12-31
NL87162C (en) * 1950-09-19
NL93755C (en) * 1951-12-21

Also Published As

Publication number Publication date
US2828264A (en) 1958-03-25
FR1114010A (en) 1956-04-06
FR67873E (en) 1958-03-25

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