Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1993-08-02
1996-07-16
Thibodeau, Paul
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
2041921, 20419211, 2041922, 427129, 428336, 428694T, 428694TS, 428694ST, 428900, C23C 1400, G11B 566, G11B 570, B32B 302
Patent
active
055365493
ABSTRACT:
An improved magnetic-recording disk and a process for manufacturing magnetic-recording disks are disclosed. A precision cold-rolled austenitic stainless steel is the substrate for a magnetic-recording disk. The surface of the substrate may be hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding. A hard coating may be applied to the substrate by evaporative reactive ion plating or reactive sputtering of aluminum nitride, silicon nitride, silicon carbide, or nitrides, carbides, or borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten.
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Nelson Carl W.
Weir Richard D.
Weir Richard S.
Sand Stephen
Thibodeau Paul
Tulip Memory Systems, Inc.
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