Method for making titanium or titanium-alloy substrate for magnetic-recording media
AssigneeTulip Memory Systems, Inc.
InventorsCarl W. Nelson, Richard D. Weir, Richard S. Weir
Life of this patent
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Abstract
An improved magnetic-recording disk and a process for manufacturing magnetic-recording disks are disclosed. Precision cold-rolled titanium or titanium alloy 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.
Claims22
A method for manufacturing a magnetic-recording disk, comprising the steps of:
- preparing a disk-shaped substrate composed of titanium or a titanium alloy;
- and then
- sputter etch cleaning a surface of the substrate;
- and then
- hardening the sputter-etch-cleaned surface of the substrate by plasma nitriding, plasma carburizing, or plasma carbonitriding;
- and then
- coating a surface of the substrate with a magnetic-recording material.
A method for manufacturing a magnetic-recording disk, comprising the steps of:
- preparing a disk-shaped substrate composed of titanium or a titanium alloy;
- and then
- sputter etch cleaning a surface of the substrate:
- and then
- hardening the surface of the substrate by plasma nitriding, plasma carburizing, or plasma carbonitriding;
- and then
- coating the hardened surface of the substrate with a layer of a hard material selected from the group consisting of aluminum nitride, silicon nitride, silicon carbide, and nitrides, carbides, and borides of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, or tungsten by a process of evaporative reactive ion plating or reactive sputtering;
- and then
- sputter depositing a layer of magnetic-recording material on the hardened surface of the substrate.
A method for manufacturing a magnetic-recording disk, comprising the steps of:
- providing a disk-shaped substrate composed of titanium or a titanium alloy, wherein the substrate has a surface;
- sputter etch cleaning the surface of the substrate;
- hardening the surface of the substrate by plasma nitriding, plasma carburizing, or plasma carbonitriding;
- and
- coating the hardened surface of the substrate with a magnetic-recording material.
A method for manufacturing a magnetic-recording disk, comprising the steps of:
- providing a disk-shaped substrate composed of titanium or a titanium alloy, wherein the substrate has a surface;
- applying a hard-material coating to the surface of the substrate, wherein the hard-material applied coating is aluminum nitride, silicon nitride, silicon carbide, or a nitride, carbide, or boride of a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten, wherein the hard-material applied coating has a thickness of at least 0.5 micrometers;
- and
- applying a coating of a magnetic-recording material overlying the hard-material applied coating.
Dependencies are inferred from the claim text.