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US5707705A
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Titanium or titanium-alloy substrate for magnetic-recording media
Assignee: Tulip Memory Systems Inc
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Filing: 1993-09-08
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Granted: 1998-01-13
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Expires: 2013-09-08
Abstract
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.
Inventors
- 👤 Carl W. Nelson
- 👤 Richard D. Weir
- 👤 Richard S. Weir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:52
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; G11B5/62; G11B5/73; G11B5/739; G11B5/73911; G11B5/73917; G11B5/73919; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
49 words
A magnetic-recording disk comprising: a disk-shaped substrate composed of titanium or a titanium alloy, wherein the substrate includes a surface cleaned by sputter etching and then hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding; and a coating of a magnetic-recording material overlying the hardened surface of the substrate.
Claim 2
Dependent Claim
49 words
A magnetic-recording disk comprising: a disk-shaped substrate composed of titanium or a titanium alloy, wherein the substrate includes a surface cleaned by sputter etching and then hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding; and a coating of a magnetic-recording material overlying the hardened surface of the substrate.
Claim 3
Dependent Claim
19 words
A magnetic-recording disk as recited in claim 1 wherein the coating of magnetic-recording material is applied by sputter deposition.
Claim 4
Dependent Claim
23 words
A magnetic-recording disk as recited in claim 1 wherein the substrate is precision blanked from flat precision cold-rolled titanium or a titanium alloy.
Claim 5
Dependent Claim
22 words
A magnetic-recording disk as recited in claim 1 wherein the substrate is a titanium alloy comprising Ti, 3% Al, and 2.5% V.
Claim 6
Dependent Claim
69 words
A magnetic-recording disk as recited in claim 1 further including a hard material coating on the hardened surface of the substrate, wherein the hard material 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, and is applied prior to the application of the magnetic-recording material.
Claim 7
Dependent Claim
21 words
A magnetic-recording disk as recited in claim 5 wherein the hard material coating has a thickness of at least 0.5 micrometers.
Claim 8
Dependent Claim
23 words
A magnetic-recording disk as recited in claim 5 wherein the hard material coating is applied by evaporative reactive ion plating or reactive sputtering.
Claim 9
Dependent Claim
31 words
A magnetic-recording disk as recited in claim 1 wherein said surface hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding has a Vickers harness of at least 1000 kg/mm 2 .
Claim 10
Dependent Claim
29 words
A magnetic-recording disk as recited in claim 1 wherein said surface is hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding to a depth of at least 15 micrometers.
Claim 11
Dependent Claim
99 words
A magnetic-recording disk comprising: a disk-shaped substrate composed of titanium or a titanium alloy; a hard material applied coating overlying a surface of the substrate, wherein the hard material 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, and is applied prior to the application of the magnetic-recording material, and wherein the hard material coating has a thickness of at least 0.5 micrometers; and a coating of a magnetic-recording material overlying the hard material coating.
Claim 12
Dependent Claim
99 words
A magnetic-recording disk comprising: a disk-shaped substrate composed of titanium or a titanium alloy; a hard material applied coating overlying a surface of the substrate, wherein the hard material 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, and is applied prior to the application of the magnetic-recording material, and wherein the hard material coating has a thickness of at least 0.5 micrometers; and a coating of a magnetic-recording material overlying the hard material coating.
Claim 13
Dependent Claim
19 words
A magnetic-recording disk as recited in claim 10 wherein the coating of magnetic-recording material is applied by sputter deposition.
Claim 14
Dependent Claim
23 words
A magnetic-recording disk as recited in claim 10 wherein the substrate is precision blanked from flat precision cold-rolled titanium or a titanium alloy.
Claim 15
Dependent Claim
22 words
A magnetic-recording disk as recited in claim 10 wherein the substrate is a titanium alloy comprising Ti, 3% Al, and 2.5% V.
Claim 16
Dependent Claim
27 words
A magnetic-recording disk as recited in claim 10 wherein the surface is cleaned by sputter etching and then hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding.
Claim 17
Dependent Claim
23 words
A magnetic-recording disk as recited in claim 10 wherein the hard material coating is applied by evaporative reactive ion plating or reactive sputtering.
Claim 18
Dependent Claim
31 words
A magnetic-recording disk as recited in claim 14 wherein said surface hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding has a Vickers harness of at least 1000 kg/mm 2 .
Claim 19
Dependent Claim
29 words
A magnetic-recording disk as recited in claim 14 wherein said surface is hardened by plasma nitriding, plasma carburizing, or plasma carbonitriding to a depth of at least 15 micrometers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |