Method of producing magnetic hard disk substrate

Details Method of producing magnetic hard disk substrate Method of producing magnetic hard disk substrate

2005-12-13

2005-12-13

Ackun, Jr., Jacob K. (Department: 3723)

Abrading

Abrading process

Utilizing fluent abradant

C451S041000, C428S690000

Reexamination Certificate

active

06974368

ABSTRACT:
A magnetic hard disk substrate is produced by rotating an aluminum substrate or a glass substrate, supplying polishing slurry on its surface, pressing a polishing tape on the surface and running it in a direction opposite to the direction of rotation of the substrate. Texturing marks are formed with a line density greater than 70 lines/μm in the radial direction on the surface. The polishing slurry has abrading particles dispersed in a dispersant. The abrading particles may be monocrystalline diamond particles, polycrystalline diamond particles or cluster particles with such monocrystalline and polycrystalline diamond particles with diameters in the range of 1-50 nm. Agglomerated particles of such cluster particles that are agglomerated in the dispersant may also be included as the abrading particles.

REFERENCES:
patent: 6743529 (2004-06-01), Saito et al.
patent: 2002/0127432 (2002-09-01), Saito et al.
patent: 2002/0142707 (2002-10-01), Shimada et al.
patent: 2004/0238002 (2004-12-01), Tanaka et al.
patent: 2005/0008822 (2005-01-01), Miyamoto et al.

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