DISC-SHAPED MAGNETIC RECORDING CARRIER

    公开(公告)号:JPS6423416A

    公开(公告)日:1989-01-26

    申请号:JP15954888

    申请日:1988-06-29

    Applicant: BASF AG

    Abstract: PURPOSE: To always impart the required amt. of a lubricant by incorporating a porous pigment having 300-1,000m /g BET specific surface area into the surface layer part of a magnetic layer by 1-10wt.% of the amt. of a magnetic material when at least one side of a nonmagnetic substrate is coated with the magnetic layer. CONSTITUTION: When at least one side of a nonmagnetic substrate is coated with a magnetic layer, this magnetic layer is made of a magnetic material finely dispersed in an org. binder and a porous pigment having 300-1,000m /g BET specific surface area is incorporated into the surface layer part of the magnetic layer by 1-10wt.%, preferably 2-6wt.% of the amt. of the magnetic material so as to reduce friction. The pigment is made of a molecular filter based on metal-aluminum silicate having a special crystal structure and the spaces in a three-dimensional network structure are formed by the reaction of aq. solns. of sodium aluminate and sodium silicate. Sticking effect is also reduced.

    MANUFACTURE OF MAGNETIC RECORDING CARRIER

    公开(公告)号:JPH01196728A

    公开(公告)日:1989-08-08

    申请号:JP31663688

    申请日:1988-12-16

    Applicant: BASF AG

    Abstract: PURPOSE: To improve wear resistance and corrosion resistance by forming a hydrogen-contg. amorphous carbon protective layer by vapor deposition while adding a hydrocarbon gas. CONSTITUTION: A ferromagnetic metal thin layer such as Co-P and a carbon protective layer (A) are formed on a nonmagnetic carrier to obtain the medium of the title. The layer (A) is a hydrogen-contg. amorphous carbon layer of 5-100nm thickness formed by vapor deposition which uses a carbon target, while simultaneously adding a hydrocarbon gas which is decomposed by the vapor deposition plasma to change into a vapor deposition gas. As for the vapor deposition, a carbon target DC magnetron vapor deposition method is preferably used, and acetylene is added by (1:0.05) to (1:1) partial pressure to the sputtering gas such as Ar.

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