Title:
MANUFACTURE OF MAGNETIC RECORDING NEEDLE FERROALLOY MAGNETIC PARTICLE POWDER
Document Type and Number:
Japanese Patent JPH04230004
Kind Code:
A
Abstract:
PURPOSE: To provide the step of industrially manufacturing the title magnetic recording needle ferroalloy magnetic particle powder in the long axial diameter of 0.05-0.2μm having high coersive force and large saturated magnetic susceptibility further in excellent S.F.D and lower decline ratio of coersive force.
CONSTITUTION: An oxide film is formed on the surface of said ferroalloy magnetic particles by processing the needle ferroalloy magnetic particles in the long axial diameter of 0/05-0.2μm produced by thermal-reducing wet needle ferric oxide particles or needle hematite particles in the mixed gas atmosphere of an inert gas containing steam of 10-50g/cm3 with oxygen containing gas.
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Inventors:
MISHIMA HIROO
OTA YASUTAKA
OKINAKA KENJI
KAWASAKI HIROSHI
MORI KOJI
IKEMOTO KUNIO
OTA YASUTAKA
OKINAKA KENJI
KAWASAKI HIROSHI
MORI KOJI
IKEMOTO KUNIO
Application Number:
JP41596790A
Publication Date:
August 19, 1992
Filing Date:
December 27, 1990
Export Citation:
Assignee:
TODA KOGYO CORP
International Classes:
B22F1/02; H01F1/11; B22F9/22; H01F1/06; (IPC1-7): H01F1/11