Recording disk substrate members and process for producing same

Details Recording disk substrate members and process for producing same Recording disk substrate members and process for producing same

1985-07-26

1987-09-01

Swisher, Nancy A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428409, 428432, 428698, H01F 1002, B05D 138, B32B 702

Patent

active

046908463

ABSTRACT:
A substrate member for recording disk characterized in that a glass coating film is provided on an alumina base ceramic material having micropores of no larger than 5 microns and a relative theoretical density of no less than 96%, said glass coating 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 200 microns and a relative difference of no more than 10.sup.-6 /deg in the coefficient of thermal expansion with respect to said base material.

REFERENCES:
patent: 3198657 (1965-08-01), Kimball et al.
patent: 3959553 (1976-05-01), Hartmann et al.
patent: 4046932 (1977-09-01), Hartmann et al.
patent: 4254189 (1981-03-01), Fisher
patent: 4396682 (1983-08-01), Mohri et al.
patent: 4528212 (1985-07-01), Cairns et al.

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