Magnetic recording medium having a ceramic substrate, an underlayer having a dense fibrous zone T structure, and a magnetic layer
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United States of America Patent
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Oct 28, 1997
Grant Date -
N/A
app pub date -
Jan 20, 1994
filing date -
Jan 20, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved magnetic-recording disk and a process for manufacturing magnetic-recording disks are disclosed. An electrically conductive hard coating is deposited upon a ceramic substrate. This coating can be one from the group including the nitrides, carbides, and borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten. Graded interfacial diffusion or pseudo-diffusion layers are formed between the ceramic substrate and the coating by the elemental metal present in the coating. Magnetic-recording media is then deposited upon the electrically conductive coating. Optionally, a texturable coating that is softer than the hard coating can be placed over the electrically conductive hard coating before the magnetic-recording media is deposited. This texturable coating limits the depth to which abrasive tape texturing can take place.
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