JPS5655503A - Production of metal magnetic powder of superior corrosion resistance - Google Patents

Production of metal magnetic powder of superior corrosion resistance

Info

Publication number
JPS5655503A
JPS5655503A JP12924179A JP12924179A JPS5655503A JP S5655503 A JPS5655503 A JP S5655503A JP 12924179 A JP12924179 A JP 12924179A JP 12924179 A JP12924179 A JP 12924179A JP S5655503 A JPS5655503 A JP S5655503A
Authority
JP
Japan
Prior art keywords
powder
granules
superior corrosion
inert gas
magnetic metal
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.)
Granted
Application number
JP12924179A
Other languages
Japanese (ja)
Other versions
JPS5914081B2 (en
Inventor
Sadakuni Nagaike
Seiichi Asada
Kazushige Imagawa
Yukio Saito
Ryokichi Yamada
Toshinobu Sueyoshi
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.)
Hitachi Ltd
Maxell Ltd
Original Assignee
Hitachi Ltd
Hitachi Maxell 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 Hitachi Ltd, Hitachi Maxell Ltd filed Critical Hitachi Ltd
Priority to JP54129241A priority Critical patent/JPS5914081B2/en
Publication of JPS5655503A publication Critical patent/JPS5655503A/en
Publication of JPS5914081B2 publication Critical patent/JPS5914081B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Powder Metallurgy (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

PURPOSE: To form an oxide film of superior corrosion resistance by oxidation- treatment of the magnetic metal powder comprising essentially iron or its granules at predetermined temperatures in an inert gas atmosphere.
CONSTITUTION: Magnetic metal powder comprising essentially iron or its granules are subjected to oxidation treatment at ≤200°C reaction temperature in an inert gas atmosphere which contains 100W10,000ppm oxygen gas and is of ≤5,000ppm steam concentration or an evacuated oxygen atmosphere of 10-2W10-4atm, whereby an oxide film is formed on powder particle surfaces. The resulted magnetic powder has passive state composition such as Fe3O4 and exhibits superior corrosion resostance. The magnetic metal powder includes powder of fine needle-like metal iron of about ≤1μ grain sizes and about ≥2 ratio of long axis/short axis and the powder comprising essentially iron and contg. Co, Ni, Cr, etc. or may be granules thereof. In addition, nitrogen gas is suitable for the inert gas mixed with oxygen gas. A fluidized bed apparatus is preferable as the reacting apparatus.
COPYRIGHT: (C)1981,JPO&Japio
JP54129241A 1979-10-05 1979-10-05 Manufacturing method of metal magnetic powder with excellent corrosion resistance Expired JPS5914081B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54129241A JPS5914081B2 (en) 1979-10-05 1979-10-05 Manufacturing method of metal magnetic powder with excellent corrosion resistance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54129241A JPS5914081B2 (en) 1979-10-05 1979-10-05 Manufacturing method of metal magnetic powder with excellent corrosion resistance

Publications (2)

Publication Number Publication Date
JPS5655503A true JPS5655503A (en) 1981-05-16
JPS5914081B2 JPS5914081B2 (en) 1984-04-03

Family

ID=15004673

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54129241A Expired JPS5914081B2 (en) 1979-10-05 1979-10-05 Manufacturing method of metal magnetic powder with excellent corrosion resistance

Country Status (1)

Country Link
JP (1) JPS5914081B2 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155354A (en) * 1981-03-20 1982-09-25 Hitachi Maxell Ltd Manufacture of ferromagnetic powder
JPS58161711A (en) * 1982-03-16 1983-09-26 Hitachi Maxell Ltd Production of magnetic metallic powder
JPS5959801A (en) * 1982-09-28 1984-04-05 Kanto Denka Kogyo Kk Method for stabilizing metallic magnetic powder
JPS59110701A (en) * 1982-12-16 1984-06-26 Mitsui Toatsu Chem Inc Stabilization of reduced iron powder for magnetic recording
JPS59207024A (en) * 1983-05-10 1984-11-24 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0239504A (en) * 1988-07-29 1990-02-08 Ishihara Sangyo Kaisha Ltd Manufacture of metallic magnetic powder for magnetic record
JPH02168415A (en) * 1989-04-10 1990-06-28 Konica Corp Magnetic recording medium
US6827757B2 (en) 2001-11-30 2004-12-07 Jfe Steel Corporation Magnetite-iron based composite powder, magnetite-iron based powder mixture, method for producing the same, method for remedying polluted soil, water or gases and electromagnetic wave absorber
WO2007119393A1 (en) 2006-03-16 2007-10-25 Matsushita Electric Industrial Co., Ltd. Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, iron core-equipped permanent magnet motor
EP2226814A1 (en) 2009-02-27 2010-09-08 MINEBEA Co., Ltd. Rare-earth iron -based magnet with self-recoverability
DE102010037838A1 (en) 2009-09-29 2011-03-31 Minebea Co., Ltd. Anisotropic resin bonded magnet based on rare earth iron
JP2016096289A (en) * 2014-11-17 2016-05-26 Tdk株式会社 Film-forming type iron nitride based magnetic powder and magnet using the same
JP2018195802A (en) * 2017-05-16 2018-12-06 株式会社デンソー Magnetic powder and magnet

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4879153A (en) * 1971-12-30 1973-10-24

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4879153A (en) * 1971-12-30 1973-10-24

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57155354A (en) * 1981-03-20 1982-09-25 Hitachi Maxell Ltd Manufacture of ferromagnetic powder
JPS58161711A (en) * 1982-03-16 1983-09-26 Hitachi Maxell Ltd Production of magnetic metallic powder
JPS5959801A (en) * 1982-09-28 1984-04-05 Kanto Denka Kogyo Kk Method for stabilizing metallic magnetic powder
JPS59110701A (en) * 1982-12-16 1984-06-26 Mitsui Toatsu Chem Inc Stabilization of reduced iron powder for magnetic recording
JPS59207024A (en) * 1983-05-10 1984-11-24 Konishiroku Photo Ind Co Ltd Magnetic recording medium
JPH0239504A (en) * 1988-07-29 1990-02-08 Ishihara Sangyo Kaisha Ltd Manufacture of metallic magnetic powder for magnetic record
JPH02168415A (en) * 1989-04-10 1990-06-28 Konica Corp Magnetic recording medium
US6827757B2 (en) 2001-11-30 2004-12-07 Jfe Steel Corporation Magnetite-iron based composite powder, magnetite-iron based powder mixture, method for producing the same, method for remedying polluted soil, water or gases and electromagnetic wave absorber
WO2007119393A1 (en) 2006-03-16 2007-10-25 Matsushita Electric Industrial Co., Ltd. Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, iron core-equipped permanent magnet motor
US8072109B2 (en) 2006-03-16 2011-12-06 Panasonic Corporation Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, and iron core-equipped permanent magnet motor
US8183732B2 (en) 2006-03-16 2012-05-22 Panasonic Corporation Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, and iron core-equipped permanent magnet motor
EP2226814A1 (en) 2009-02-27 2010-09-08 MINEBEA Co., Ltd. Rare-earth iron -based magnet with self-recoverability
DE102010037838A1 (en) 2009-09-29 2011-03-31 Minebea Co., Ltd. Anisotropic resin bonded magnet based on rare earth iron
US8329056B2 (en) 2009-09-29 2012-12-11 Minebea Co., Ltd. Anisotropic rare earth-iron based resin bonded magnet
JP2016096289A (en) * 2014-11-17 2016-05-26 Tdk株式会社 Film-forming type iron nitride based magnetic powder and magnet using the same
JP2018195802A (en) * 2017-05-16 2018-12-06 株式会社デンソー Magnetic powder and magnet

Also Published As

Publication number Publication date
JPS5914081B2 (en) 1984-04-03

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