DURABLE MAGNETIC POWDER AND MAGNETIC RECORDING MEDIUM USING SAID POWDER

PURPOSE:To enhance the hardness of magnetic powder and to improve the durability of a magnetic recording medium by coating the surface of the magnetic powder with a Zr compd. CONSTITUTION:The Zr compd. is made to exist in the layer near the surface of the magnetic powder. Such a Zr oxide as represen...

Full description

Saved in:
Bibliographic Details
Main Authors SUEYOSHI TOSHINOBU, ASADA SEIICHI
Format Patent
LanguageEnglish
Published 27.02.1989
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
INKS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PHYSICS
POLISHES
USE OF MATERIALS THEREFOR
WOODSTAINS
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To enhance the hardness of magnetic powder and to improve the durability of a magnetic recording medium by coating the surface of the magnetic powder with a Zr compd. CONSTITUTION:The Zr compd. is made to exist in the layer near the surface of the magnetic powder. Such a Zr oxide as represented by ZrO2 is general as the Zr compd. and the means for allowing said compd. to exist in the layer near the surface of the magnetic powder is arbitrary. The content of Zr as the Zr compd. is preferably 0.5-10wt.% based on the weight of the magnetic powder. Importation of sufficient hardness to the magnetic powder is not possible at <0.5wt.% and the saturation magnetization is deteriorated if the content exceeds 10wt.% and, therefore, such ratios are undesirable. The magnetic powder having the excellent durability and the magnetic recording medium are obtd. by increasing the surface hardness of the magnetic powder in such a manner.
Bibliography:Application Number: JP19870207738