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US 5,480,695 AGranted
Ceramic substrates and magnetic data storage components prepared therefrom
OwnerMichael A. Tenhover, Irving R. Ruppelinventors
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Abstract
Substrates are disclosed having an ultra-smooth surface finish thereon rendering them useful in making high density magnetic storage components, such as a computer hard disk or thin-film head which can read and/or write data on such disks. The substrates are comprised of a non-oxide ceramic base which is coated with a smoothing layer comprised of amorphous, non-stoichiometric silicon carbide corresponding to the formula SiC.sub.x, wherein x is the molar ratio of carbon to silicon and is greater than 1. Also disclosed are processes for making the substrates and components.
Claims10
A magnetic storage medium comprising:
- a non-oxide ceramic base having a density of at least about 90 percent of theoretical density and a coefficient of thermal expansion of from about 2 to about 7 ppm/.degree. C.;
- a substantially amorphous smoothing layer comprised of silicon carbide corresponding to the formula SiC.sub.x wherein x is the molar ratio of carbon to silicon and is greater than 1, the smoothing layer having an inner surface contacting at least one surface of the ceramic base and an outer surface with a surface roughness of about 100 .ANG. Ra or less;
- and
- a magnetic layer capable of storing data and having an inner surface and an outer surface, the magnetic layer being disposed over the smoothing layer.
1 more element
Dependencies are inferred from the claim text.