Magnetic disk, substrate therefor and process for preparation th

Details Magnetic disk, substrate therefor and process for preparation th Magnetic disk, substrate therefor and process for preparation th

1986-02-24

1988-04-19

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

264 62, 264 65, 264 66, 360135, 427129, 427292, 428694, 428900, 428141, G11B 5704, G11B 582

Patent

active

047388854

ABSTRACT:
Disclosed is a substrate for a magnetic disk, which comprises a ceramic substrate formed by subjecting a ceramic molded body to hot isostatic pressing in an inert atmosphere and subsequently to polishing treatment. In this magnetic disk substrate, the number of void defects is greatly reduced, and the substrate per se is excellent in the heat resistance and deformation resistance. If this substrate is used, there is provided a magnetic recording disk of a high reliability where recording can be performed at a high density with precise writing and reading.

REFERENCES:
patent: 4128691 (1978-12-01), Shirahata et al.
patent: 4272500 (1981-06-01), Eggerding et al.
patent: 4340436 (1982-07-01), Dubetsky et al.
patent: 4411963 (1983-10-01), Aine
patent: 4569822 (1986-02-01), Brown et al.
patent: 4582681 (1986-04-01), Asari et al.

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