US4237184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stratified protecting coating for wearing pieces and hard metal cutting tools
Assignee: Stellram SA
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Filing: 1979-06-15
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Granted: 1980-12-02
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Expires: 1999-06-15
Abstract
Abstract This invention relates to a hard metal wearing piece, especially for tools, which is covered at least on the places subjected to wear with stratified protecting coating. This stratified protecting coating comprises at least five superimposed layers, at least two of them being of different compositions; furthermore, the internal layer in contact with the substrate is a layer of carbide, the external layer is a layer of boride or carbide, and the intermediary layers are of carbide, nitride, oxide, boride, and/or of mixed compounds thereof.
Inventors
- 👤 Denis R. Gonseth
- 👤 Charles Hauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:58
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/269; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A hard metal wearing piece, especially for tools, which is covered at least on the places subjected to wear with a stratified protecting coating comprising at least five superimposed layers, at least two of them having different compositions, the layer which is in contact with the surface of the piece consisting in a carbide layer, the external layer consisting in a boride or a carbide layer, and the intermediary layers being layers of carbide, nitride, oxide, boride or of mixed compounds thereof.
Claim 2
Dependent Claim
82 words
A hard metal wearing piece, especially for tools, which is covered at least on the places subjected to wear with a stratified protecting coating comprising at least five superimposed layers, at least two of them having different compositions, the layer which is in contact with the surface of the piece consisting in a carbide layer, the external layer consisting in a boride or a carbide layer, and the intermediary layers being layers of carbide, nitride, oxide, boride or of mixed compounds thereof.
Claim 3
Dependent Claim
17 words
A wearing piece according to claim 1, in which said coating comprises at least ten superimposed layers.
Claim 4
Dependent Claim
23 words
A wearing piece according to claim 1, in which said coating comprises an alternating succession of at least two layers of different compositions.
Claim 5
Dependent Claim
22 words
A wearing piece according to claim 1, in which said coating comprises several times the same group of layers of different compositions.
Claim 6
Dependent Claim
16 words
A wearing piece according to claim 1, in which said external layer is a boride layer.
Claim 7
Dependent Claim
22 words
A wearing piece according to claim 1, in which the total thickness of said coating is comprised between about 1 and 20μ.
Claim 8
Dependent Claim
25 words
A wearing piece according to claim 1, in which said carbide and nitride layers are consisting of Hf, Zr, Ti or Ta carbides and nitrides.
Claim 9
Dependent Claim
22 words
A wearing piece according to claim 1, in which said boride layers are consisting of Hf, Zr, Ti, Ta or N borides.
Claim 10
Dependent Claim
22 words
A wearing piece according to claim 1, in which said oxide layers are consisting of Hf, Zr, Ti, Be or Al oxides.
Claim 11
Dependent Claim
25 words
A wearing piece according to claim 1, in which said coating is consisting in the succession of TiC, TiCN, TiN, TiBN and TiB 2 .
Claim 12
Dependent Claim
26 words
A wearing piece according to claim 1, in which said coating is consisting in the succession of TiC, TiCN, TiN, Al 2 O 3 and TiC.
Claim 13
Dependent Claim
30 words
A wearing piece according to claim 1, in which said coating is consisting in the succession of TiC, TiCN, TiN, TiCN, TiC, Al 2 O 3 and TiB 2 .
Claim 14
Dependent Claim
40 words
A wearing piece according to claim 1, in which said coating comprises several successive layers of carbonitrides, respectively of boronitrides, said successive layers differing from each other by the C and N contents, respectively by the B and N contents.
References Cited (Backward Citations)
US3368914A
Cited
US3656995A
Cited
US3640689A
Cited
US3964937A
Cited
US3959557A
Cited
US4018631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |