GB1286468A - Improvements in or relating to magnetic materials - Google Patents

Improvements in or relating to magnetic materials

Info

Publication number
GB1286468A
GB1286468A GB5270668A GB5270668A GB1286468A GB 1286468 A GB1286468 A GB 1286468A GB 5270668 A GB5270668 A GB 5270668A GB 5270668 A GB5270668 A GB 5270668A GB 1286468 A GB1286468 A GB 1286468A
Authority
GB
United Kingdom
Prior art keywords
ferrite
relating
magnetic materials
max
sodium
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
GB5270668A
Inventor
Ronald George Skelton
Keith Harold Southwood
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.)
Plessey Co Ltd
Original Assignee
Plessey Co 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB5270668A priority Critical patent/GB1286468A/en
Priority to FR6937987A priority patent/FR2022693B1/fr
Priority to DE19691955611 priority patent/DE1955611A1/en
Publication of GB1286468A publication Critical patent/GB1286468A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

1286468 Ferrites PLESSEY CO Ltd 23 Oct 1969 [6 Nov 1968] 52706/68 Heading C1A [Also in Division H1] A hard magnetic ferrite is made by calcining, at 900‹ C. or higher, a mixture of ferrite-forming materials containing 0À25 to 1À0% by weight of a metallic borate, to raise the BH max value. The ferrite may be of the type Me x Sr 1-x O.nFe 2 O 3 where Me is Ba, Ca or Pb; x + 0 to 1 and n = 4À0 to 7À0. In examples, barium, strontium and sodium metaborates, sodium perborate and (for comparison) lead monosilicate, are added to reaction mixtures in the preparation of SrO.5À8Fe 2 O 3 . Sintering is effected at 1240‹ C. or 1260‹ C. and calcination at 1250‹ C. and 1275‹ C. Values of BH max of 3À4 to 3À9 MGOe are obtained.
GB5270668A 1968-11-06 1968-11-06 Improvements in or relating to magnetic materials Expired GB1286468A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB5270668A GB1286468A (en) 1968-11-06 1968-11-06 Improvements in or relating to magnetic materials
FR6937987A FR2022693B1 (en) 1968-11-06 1969-11-05
DE19691955611 DE1955611A1 (en) 1968-11-06 1969-11-05 Process for making a hard magnetic ferrite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5270668A GB1286468A (en) 1968-11-06 1968-11-06 Improvements in or relating to magnetic materials

Publications (1)

Publication Number Publication Date
GB1286468A true GB1286468A (en) 1972-08-23

Family

ID=10464966

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5270668A Expired GB1286468A (en) 1968-11-06 1968-11-06 Improvements in or relating to magnetic materials

Country Status (3)

Country Link
DE (1) DE1955611A1 (en)
FR (1) FR2022693B1 (en)
GB (1) GB1286468A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN150524B (en) * 1978-02-09 1982-11-06 Aimants Ugimag Sa
US4259197A (en) * 1978-02-09 1981-03-31 Aimants Ugimag S.A. Process of preparing ferrite powders
FR2417168A1 (en) * 1979-02-06 1979-09-07 Aimants Ugimag Sa Strong permanent magnets made from ferrite powder - esp. flexible magnets, using inexpensive process to produce high energy prod.
JPS5827212B2 (en) * 1979-06-08 1983-06-08 同和鉱業株式会社 Dry manufacturing method of hexagonal ferrite
US4279763A (en) * 1980-04-09 1981-07-21 Aimants Ugimag S.A. Process of preparing ferrite powders

Also Published As

Publication number Publication date
FR2022693B1 (en) 1973-03-16
FR2022693A1 (en) 1970-08-07
DE1955611A1 (en) 1970-06-11

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee