Title:
【発明の名称】磁気記録用針状晶鉄合金磁性粒子粉末
Document Type and Number:
Japanese Patent JP2767056
Kind Code:
B2
Abstract:
PURPOSE:To manufacture the subject magnetic particle powder improving wetting and releasing in binder by containing B, Co, Al and Ni near surfaces of acicular crystallized goethite particles. CONSTITUTION:The surfaces of the acicular crystallized goethite particles having uniform particle size and mixing no dendrite particles, are coated with B compound (KBO2, etc.), Co compound (CoSO4, etc.), Al compound [Al(SO4)3, etc.] and/or Ni compound (NiSO4, etc.). Successively, this is heated and treated at about 300-600 deg.C to make the particles coated with the respective oxide of B, Co, Al and/or Ni, and further, this is heated and reduced at about 300-500 deg.C to obtain the acicular crystallized iron alloy magnetic particle powder containing B, Co, Al and/or Ni near the surfaces of the particles. By this method, the particle powder having coercive force and saturation magnetization and excellent oxidation stability, S.F.D. and wetting and releasing into the binder particularly containing resin having acidic functional group, is obtd. and suitable to the high density record and high output.
Inventors:
MISHIMA HIROO
TANIHARA MAMORU
OOTA YASUTAKA
KAWASAKI HIROSHI
OKINAKA KENJI
IKEMOTO KUNIO
MORI KOJI
NAGAI NORIMICHI
TANIHARA MAMORU
OOTA YASUTAKA
KAWASAKI HIROSHI
OKINAKA KENJI
IKEMOTO KUNIO
MORI KOJI
NAGAI NORIMICHI
Application Number:
JP7249289A
Publication Date:
June 18, 1998
Filing Date:
March 24, 1989
Export Citation:
Assignee:
TODA KOGYO KK
International Classes:
B22F1/00; C09D5/23; C09D7/12; C22C38/10; G11B5/706; G11B5/842; H01F1/06; B22F9/22; (IPC1-7): B22F1/00; G11B5/706; H01F1/06
Domestic Patent References:
| JP5167250A | ||||
| JP6484601A |