Method for making ceramic substrates for magnetic-recording medi

Details Method for making ceramic substrates for magnetic-recording medi Method for making ceramic substrates for magnetic-recording medi

1997-04-18

1999-01-05

Resan, Stevan A.

Coating processes

Magnetic base or coating

Magnetic coating

427131, 427528, 427530, 427531, 20419216, 2041922, 20419231, C23C 1400

Patent

active

058559515

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.

REFERENCES:
patent: 4828905 (1989-05-01), Wada
patent: 5487931 (1996-01-01), Annacone
patent: 5626920 (1997-05-01), Weir et al.

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