GB731512A - Process for preparing iron powder of improved electromagnetic and mechanical properties - Google Patents

Process for preparing iron powder of improved electromagnetic and mechanical properties

Info

Publication number
GB731512A
GB731512A GB27704/53A GB2770453A GB731512A GB 731512 A GB731512 A GB 731512A GB 27704/53 A GB27704/53 A GB 27704/53A GB 2770453 A GB2770453 A GB 2770453A GB 731512 A GB731512 A GB 731512A
Authority
GB
United Kingdom
Prior art keywords
iron powder
iron
silicate
mechanical properties
hours
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
GB27704/53A
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.)
GAF Chemicals Corp
Original Assignee
General Aniline and Film Corp
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 General Aniline and Film Corp filed Critical General Aniline and Film Corp
Publication of GB731512A publication Critical patent/GB731512A/en
Expired legal-status Critical Current

Links

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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/14—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 soft-magnetic materials metals or alloys
    • H01F1/20—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—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 soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/16—Metallic particles coated with a non-metal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

The process of improving the electromagnetic properties of carbonyl iron powder comprises subjecting pulverulent iron, obtained by the thermal decomposition of iron pentacarbonyl, to a milling treatment in a ball mill running at approximately one-half critical speed, with ratios of milling bodies to iron powder of from 1 : 1 to 6 : 1 by weight, in the presence of a metallic silicate such as Al, Ba, Ca, Cu, Mg, Mn, Ni, Sr, Zn and ferrous silicate in the proportion of 0.1 to 0.5 per cent based on the weight of the iron powder, and an atmosphere of nitrogen, for from 1-10 hours to induce the attachment of silicate particles to the surface of the iron particles. The treated powder is reduced with hydrogen, containing less than 0.9 per cent impurities, at 450-650 DEG C. for 5-20 hours. U.S.A. Specifications 1,759,659 and 2,508,705 are referred to.
GB27704/53A 1952-10-22 1953-10-08 Process for preparing iron powder of improved electromagnetic and mechanical properties Expired GB731512A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US731512XA 1952-10-22 1952-10-22

Publications (1)

Publication Number Publication Date
GB731512A true GB731512A (en) 1955-06-08

Family

ID=22112026

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27704/53A Expired GB731512A (en) 1952-10-22 1953-10-08 Process for preparing iron powder of improved electromagnetic and mechanical properties

Country Status (1)

Country Link
GB (1) GB731512A (en)

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