Abrasion-resistant magnetic recording disk

Details Abrasion-resistant magnetic recording disk Abrasion-resistant magnetic recording disk

1985-10-02

1987-08-25

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

360135, 427131, 428694, 428900, G11B 568, G11B 582

Patent

active

046892605

ABSTRACT:
A magnetic recording disk comprises a magnetic layer consisting of a binder and magnetic particles, a silicon substrate and abrasion-resistant material formed on the silicon substrate. The abrasion-resistant material is in the form of elevations which protrude from the silicon substrate and whose surface is coplanar with the surface of the magnetic layer. The abrasion-resistant elevations are formed on the substrate in a predetermined uniform distribution either after the surface of the substrate has been blanket doped and/or covered with a layer comprising aluminum as a main component, by tempering and optionally oxidizing; or after the surface of the substrate has been selectively doped, by etching off the undoped regions of the surface of the substrate.

REFERENCES:
patent: 2501126 (1950-03-01), Howell
patent: 4351010 (1982-09-01), Arai et al.
patent: 4430387 (1984-02-01), Nakagawa et al.
patent: 4539265 (1985-09-01), Yazawa et al.

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