GB788727A - Improvements in or relating to ferromagnetic materials having substantially rectangular hysteresis loops - Google Patents

Improvements in or relating to ferromagnetic materials having substantially rectangular hysteresis loops

Info

Publication number
GB788727A
GB788727A GB2856854A GB2856854A GB788727A GB 788727 A GB788727 A GB 788727A GB 2856854 A GB2856854 A GB 2856854A GB 2856854 A GB2856854 A GB 2856854A GB 788727 A GB788727 A GB 788727A
Authority
GB
United Kingdom
Prior art keywords
substantially rectangular
oxides
rectangular hysteresis
materials
relating
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
GB2856854A
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 GB788727A publication Critical patent/GB788727A/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
    • C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
    • C04B35/2625—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing magnesium

Landscapes

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

Abstract

788,727. Magnetic compositions. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Oct. 4, 1954 [Oct. 7, 1953], No. 28568/54. Drawings to Specification. Class 38 (2). A magnetic ferrite material having a substantially rectangular hysteresis loop comprising oxides of iron, manganese and magnesium in proportions by weight, between 50 and 70 per cent Fe 2 O 3 , 3.1-10 per cent MgO, the balance being MnO 2 , is made by mixing oxides of the metals and heating to between 1150-1450‹ C., preferably between 1250‹ and 1350‹ C. in air or nitrogen. Alternatively compounds which change to oxides during the manufacture, e.g. carbonates and sulphates, may be used. The materials are ground with alcohol in a ball-mill, dried, preheated at 700‹ C. for 1 hour, cooled and reground with alcohol, dried, sieved, granulated after the addition of a binder, pressed at 4 tons/ sq. cm. and then sintered. It is shown that the best results are obtained with materials having the formula (Mn a Mg( 1-a) )Fe 2 O 4' where a is 0.5-1, the optimum conditions being obtained when the formula is where a is 0.5-1 and b is 0.25-0.75. Specification 735,375 is referred to.
GB2856854A 1953-10-07 1954-10-04 Improvements in or relating to ferromagnetic materials having substantially rectangular hysteresis loops Expired GB788727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL788727X 1953-10-07

Publications (1)

Publication Number Publication Date
GB788727A true GB788727A (en) 1958-01-08

Family

ID=19832350

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2856854A Expired GB788727A (en) 1953-10-07 1954-10-04 Improvements in or relating to ferromagnetic materials having substantially rectangular hysteresis loops

Country Status (5)

Country Link
BE (1) BE532384A (en)
CH (1) CH340561A (en)
DE (1) DE1062611B (en)
FR (1) FR1109365A (en)
GB (1) GB788727A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042618A (en) * 1959-06-09 1962-07-03 Ibm Preparation of a bistable ferrite circuit element

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987481A (en) * 1956-10-15 1961-06-06 Ibm Manganese-zinc ferrite
NL257266A (en) * 1959-11-10
NL256989A (en) * 1959-11-10

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE488125A (en) * 1948-03-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042618A (en) * 1959-06-09 1962-07-03 Ibm Preparation of a bistable ferrite circuit element

Also Published As

Publication number Publication date
FR1109365A (en) 1956-01-25
DE1062611B (en) 1959-07-30
CH340561A (en) 1959-08-31
BE532384A (en) 1955-04-07

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