JPS649604A - Manufacture of ferromagnetic metal powder - Google Patents

Manufacture of ferromagnetic metal powder

Info

Publication number
JPS649604A
JPS649604A JP62164275A JP16427587A JPS649604A JP S649604 A JPS649604 A JP S649604A JP 62164275 A JP62164275 A JP 62164275A JP 16427587 A JP16427587 A JP 16427587A JP S649604 A JPS649604 A JP S649604A
Authority
JP
Japan
Prior art keywords
reduction
initial stage
stage
inactive gas
initial
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.)
Pending
Application number
JP62164275A
Other languages
Japanese (ja)
Inventor
Yasuo Monno
Hirotsugu Ichikawa
Shiyuuhei Arikita
Yoshio Aoki
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.)
Kao Corp
Original Assignee
Kao 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 Kao Corp filed Critical Kao Corp
Priority to JP62164275A priority Critical patent/JPS649604A/en
Publication of JPS649604A publication Critical patent/JPS649604A/en
Pending 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
    • H01F1/032—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
    • H01F1/065—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 obtained by a reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE:To improve coercive force and oxidation resistance by controlling temperatures at specified values in the initial stage and the intermediaet stage of reduction, and performing reduction reaction in the initial stage of the reduction by using a mixture of hydrogen gas and inactive gas. CONSTITUTION:The temperature of the initial stage of reduction is made to be 370 deg.C or less. The temperature in the intermediate stage of the reduction is made to be 330-500 deg.C. In the initial stage of the reduction, the mixture of hydrogen gas and inactive gas is used. The initial stage of the reduction is a coexisting period of mainly Fe2O3 and Fe3O4 in the initial period of the reduction. This is the reduction step until the weight is reduced at least 1% and the maximum of 5% from the initial weight. The intermediate stage of the reduction is the reduction step from the end of the initial stage of the reduction to the final point, where the including amount of metal indicates at least 1% and the maximum of 5%. As the inactive gas to be used, nitrogen, argon, helium and the like are listed. lt is desirable that the mixing ratio of the hydrogen and the inactive gas in the initial stage of the reduction is in the range of hydrogen/inactive gas = 10/1-/100.
JP62164275A 1987-07-01 1987-07-01 Manufacture of ferromagnetic metal powder Pending JPS649604A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62164275A JPS649604A (en) 1987-07-01 1987-07-01 Manufacture of ferromagnetic metal powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62164275A JPS649604A (en) 1987-07-01 1987-07-01 Manufacture of ferromagnetic metal powder

Publications (1)

Publication Number Publication Date
JPS649604A true JPS649604A (en) 1989-01-12

Family

ID=15789990

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62164275A Pending JPS649604A (en) 1987-07-01 1987-07-01 Manufacture of ferromagnetic metal powder

Country Status (1)

Country Link
JP (1) JPS649604A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258809A (en) * 1988-08-24 1990-02-28 Dowa Mining Co Ltd Manufacture of metallic magnetic powder for magnetic recording medium
JPH03283403A (en) * 1990-03-30 1991-12-13 Nippon Steel Corp Manufacture of metal magnetic powder
JP2009018080A (en) * 2007-07-13 2009-01-29 Hoya Corp Adjusting tool for assembling endoscope insertion part, and method for assembling it

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258809A (en) * 1988-08-24 1990-02-28 Dowa Mining Co Ltd Manufacture of metallic magnetic powder for magnetic recording medium
JPH03283403A (en) * 1990-03-30 1991-12-13 Nippon Steel Corp Manufacture of metal magnetic powder
JP2009018080A (en) * 2007-07-13 2009-01-29 Hoya Corp Adjusting tool for assembling endoscope insertion part, and method for assembling it

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