US4594294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer coating including disordered, wear resistant boron carbon external coating
Assignee: Bodycote Metallurgical Coatings Inc
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Filing: 1984-10-09
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Granted: 1986-06-10
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Expires: 2004-10-09
Abstract
Abstract A wear resistant multilayer coating is provided. The wear resistant coating comprises at least one internal layer and a thin, external layer of disordered boron and carbon applied to a substrate. The synergistic interaction of a hard internal layer and a lubricious boron and carbon layer provides a long lived tool coating. In a more specific embodiment, the external layer of the coating is disordered boron carbide. In accordance with one embodiment, the disordered boron and carbon external coating is of a composition B x C 1-x where x is from about 0.60 to about 0.90.
Inventors
- 👤 Erwin Eichen
- 👤 James Flasck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:25
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/02; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0635; C23C28/00; C23C28/04; C23C28/044; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
67 words
A coated article comprising: (a) a substrate; (b) a multilayer coating on said substrate, said multilayer coating comprising: (i) a first titanium nitride layer on the substrate; (ii) a titanium carbide layer atop the first titanium nitride; (iii) an alumina layer atop the titanium carbide layer; (iv) a second titanium nitride layer atop the titanium carbode layer; and (v) an external layer of disordered boron and carbon.
Claim 2
Dependent Claim
67 words
A coated article comprising: (a) a substrate; (b) a multilayer coating on said substrate, said multilayer coating comprising: (i) a first titanium nitride layer on the substrate; (ii) a titanium carbide layer atop the first titanium nitride; (iii) an alumina layer atop the titanium carbide layer; (iv) a second titanium nitride layer atop the titanium carbode layer; and (v) an external layer of disordered boron and carbon.
Claim 3
Dependent Claim
30 words
The coated article of claim 1 wherein the external layer has composition on an atomic basis of B x C 1-x where x is from about 0.60 to about 0.90.
Claim 4
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises amorphous material.
Claim 5
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises polycrystalline material.
Claim 6
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon comprises microcrystalline material.
Claim 7
Dependent Claim
28 words
The coated article of claim 2 wherein the disordered boron and carbon comprises at least one phase selected from the group consisting of amorphous, microcrystalline, and polycrystalline phases.
Claim 8
Dependent Claim
15 words
The coated article of claim 2 wherein the disordered boron and carbon is substantially amorphous.
Claim 9
Dependent Claim
16 words
The coated article of claim 2 wherein the disordered boron and carbon comprises disordered boron carbide.
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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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |