Amorphous carbon substrate for a magnetic disk and a method of m

Details Amorphous carbon substrate for a magnetic disk and a method of m Amorphous carbon substrate for a magnetic disk and a method of m

1991-03-28

1994-07-05

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

360131, 360135, 428 64, 428141, 428167, 428408, 428694SG, 428694ST, 428694TS, 428694TC, C01B 3102

Patent

active

053266072

ABSTRACT:
The surface of a blank for a textured amorphous carbon substrate is polished in a surface with a predetermined surface roughness, and then the blank with a polished surface is heated at a predetermined temperature in an oxidizing atmosphere to form minute irregularities in the polished surface through a reaction expressed by C+O.sub.2 =CO.sub.2 so that the surface is textured in an appropriate surface roughness. A randomly textured amorphous carbon substrate has a randomly textured surface with a surface roughness Ra in the range of 20 to 100 .ANG. and the ratio Ra.sub.2 /Ra.sub.1, where Ra.sub.1 is the surface roughness with respect to a circumferential direction, and Ra.sub.2 is the surface roughness with respect to a radial direction, in the range of 0.75 to 1.25 .ANG.. A concentrically textured amorphous carbon substrate has a concentrically textured surface with a surface roughness Ra in the range of 30 to 100 .ANG. or in the range of 40 to 200 .ANG., and the ratio Ra.sub.2 /Ra.sub.1 of 1.75 or greater.

REFERENCES:
patent: 4716078 (1987-12-01), Kishine et al.
patent: 4774140 (1988-09-01), Wakasa
patent: 5045298 (1991-09-01), Muramatsu et al.

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