Substrate members for recording disks and process for producing

Details Substrate members for recording disks and process for producing Substrate members for recording disks and process for producing

1985-04-26

1987-04-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

427129, 427130, 427131, 427331, 428336, 428472, 428693, 428694, 428900, 20419215, 20419223, G11B 582

Patent

active

046596062

ABSTRACT:
A substrate member for recording disks comprises a sputtered film of Al.sub.2 O.sub.3, SiO.sub.2 and/or Si.sub.3 N.sub.4 on the surface of an alumina base ceramic material having therein micropores of no more than 5 microns and a relative theoretical density of no less than 96% said sputtered film having a surface roughness of no more than 80 angstroms, being substantially pore-free and strain-free on the surface, and having a thickness of 0.3 to 30 microns.

REFERENCES:
patent: 3470020 (1969-09-01), Boudreaux et al.
patent: 3681225 (1972-08-01), Genma et al.
patent: 3764507 (1973-10-01), McKinnon et al.
patent: 4307156 (1981-12-01), Yanagisawa

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