Recording disk substrate members and process for producing same
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United States of America Patent
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-
Sep 1, 1987
Grant Date -
N/A
app pub date -
Jul 26, 1985
filing date -
Aug 15, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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