Patent US4895770A successfully refreshed from Google Patents.
US4895770A
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Process for the manufacture of multi-layered, coated hardmetal parts
Assignee: Schwarzkopf Technologies Corp
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Filing: 1988-08-30
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Granted: 1990-01-23
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Expires: 2008-08-30
Abstract
Abstract The invention relates to a process for the manufacture of multi-layered wear-resistant CVD- or PVD-coatings applied to hardmetal parts containing WC-Co or WC-Ni, where at least one of the layers is a metal-boronitride layer. According to the invention, the boron concentration in the metal-boronitride layer is maintained below the critical level above which in addition a homogeneous boronitride mixed crystal phase a further phase, particularly a diboride phase is formed. A non-boronic, or only slightly boronic, intermediate layer is employed as a diffusion barrier between the hardmetal and the metal-boronitride layer to limit or prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases on the external surface of the hardmetal. The metallic boronitride layer can be applied either as a single layer or in multiple layers alternating with other mechanically resistant layers. The hardmetal part is particularly a cutting insert for machining.
Inventors
- 👤 Wilfried Schintlmeister
- 👤 Wolfgang Wallgram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:39
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C14/00; C23C14/06; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12576; Y10T428/12771; Y10T428/12861; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
81 words
A coated hardmetal part comprised of: (a) a WC-Co or WC-Ni hardmetal substrate; (b) an intermediate coating on said substrate comprised of TiC and/or TiCN, so as to provide a diffusion barrier to prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases in the external zone of the hardmetal part; and (c) a metal-boronitride coating on said intermediate layer wherein the boron concentration in said metal-boronitride layer is maintained so as to prevent formation of diboride phase.
Claim 2
Dependent Claim
81 words
A coated hardmetal part comprised of: (a) a WC-Co or WC-Ni hardmetal substrate; (b) an intermediate coating on said substrate comprised of TiC and/or TiCN, so as to provide a diffusion barrier to prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases in the external zone of the hardmetal part; and (c) a metal-boronitride coating on said intermediate layer wherein the boron concentration in said metal-boronitride layer is maintained so as to prevent formation of diboride phase.
Claim 3
Dependent Claim
17 words
The part of claim 1 further comprising: (d) a plurality of intermediate layers of TiC and/or TiCN.
Claim 4
Dependent Claim
27 words
The part of claim 2 further comprising: (e) a plurality of metal-boronitride layers wherein the boron concentration is maintained so as to prevent formation of diboride phase.
Claim 5
Dependent Claim
114 words
A process for the manufacture of multi-layered, wear-resistant chemical vapor deposition or physical vapor deposition coatings on a hardmetal part, comprising the steps of: (a) coating said hardmetal part with an intermediate layer of TiC and/or TiCN, so as to provide a diffusion barrier to prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases in the external zone of the hardmetal part; and (b) thereafter applying at least one homogeneous metal-boronitride mixed crystal layer to said intermediate layer at temperatures below about 1050° C. with a gas composition comprised of sources of boron and nitrogen, wherein the boron concentration is maintained so as to prevent formation of a diboride phase.
Claim 6
Dependent Claim
114 words
A process for the manufacture of multi-layered, wear-resistant chemical vapor deposition or physical vapor deposition coatings on a hardmetal part, comprising the steps of: (a) coating said hardmetal part with an intermediate layer of TiC and/or TiCN, so as to provide a diffusion barrier to prevent the formation of brittle tungsten cobalt boron or tungsten nickel boron phases in the external zone of the hardmetal part; and (b) thereafter applying at least one homogeneous metal-boronitride mixed crystal layer to said intermediate layer at temperatures below about 1050° C. with a gas composition comprised of sources of boron and nitrogen, wherein the boron concentration is maintained so as to prevent formation of a diboride phase.
Claim 7
Dependent Claim
22 words
A process according to claim 4, further comprising the step of: (c) applying a plurality of intermediate layers of TiC and/or TiCN.
Claim 8
Dependent Claim
38 words
A process according to claim 5, further comprising the step of: (d) applying a plurality of metal-boronitride layers at temperatures below 1050° C., wherein the boron concentration is maintained so as to prevent formation of a diboride phase.
Claim 9
Dependent Claim
36 words
A process according to claim 6, wherein the plurality of said metal-boronitride layers are from about 0.5 to about 3 um thick and alternate with said intermediate layers of about 1 to about 10 um thick.
Claim 10
Dependent Claim
18 words
A process according to claim 7, wherein said intermediate layers are about 1 to about 10 um thick.
Claim 11
Dependent Claim
10 words
A process according to claim 7, wherein said layers repeat.
Claim 12
Dependent Claim
25 words
A process according to claim 4, wherein said metal-boronitride layer is selected from the group consisting of nitrides of the Group IV and V elements.
Claim 13
Dependent Claim
25 words
A process according to claim 4, wherein said metal-boronitride layer is titanium boronitride comprising a boron concentration of from about 1 to 20 weight percent.
Claim 14
Dependent Claim
23 words
A process according to claim 11, wherein said titanium boronitride comprises a boron concentration of from about 1.5 to about 15 weight percent.
Claim 15
Dependent Claim
26 words
A process according to claim 4, wherein said metal-boronitride layer is zirconium boronitride comprising a boron concentration of from about 0.05 to about 5 weight percent.
Claim 16
Dependent Claim
23 words
A process according to claim 11, wherein said zirconium boronitride comprises a boron concentration of from about 0.1 to about 2 weight percent.
Claim 17
Dependent Claim
20 words
A process according to claim 4, wherein said metal-boronitride layer is carbon-boronitride comprising a carbon content of about 50% nitrogen.
Claim 18
Dependent Claim
38 words
A process according to claim 4, wherein said intermediate layer is selected from the group consisting of carbides, carbonitrides and nitrides of Group IV and VI elements and each intermediate layer is about 1 to 10 um thick.
Claim 19
Dependent Claim
34 words
A process according to claim 6, wherein a plurality of metal-boronitride layers, each about 0.5-3 um thick, are deposited and alternate with pure nitride or carbonitride intermediate layers which are about 0.1-1 um thick.
Claim 20
Dependent Claim
31 words
A process according to claim 6, wherein a plurality of metal-boronitride layers, each about 0.5-3 um thick, alternate with pure oxynitride or oxycarbonitride intermediate layers which are about 0.1-1 um thick.
Claim 21
Dependent Claim
27 words
A process according to claim 17, wherein a layer composite following the intermediate layer is deposited to an overall layer thickness of about 1 and 20 um.
Claim 22
Dependent Claim
214 words
A process for coating a hardmetal disposable insert part, comprised of TiC, Ti(Nb)C, Co and the remainder WC, comprising the steps of: (a) inserting said part into a chamber for chemical vapor deposition process coating; (b) heating said chamber with an inert gas at atmospheric pressure; (c) introducing a first gas composition into said chamber, wherein said first gas composition comprises, H 2 , TiCl 4 , CH 4 and Ar; then (d) introducing a second gas composition into said chamber, wherein said second gas composition comprises, H 2 , TiCl 4 , N 2 , CH 4 and Ar; then (e) introducing said first gas composition into said chamber; then (f) introducing said second gas composition into said chamber; and (g) introducing a third gas composition into said chamber wherein said third gas composition comprises, H 2 , TiCl 4 , N 2 , and BCl 3 ; whereby step (c) forms a first layer on top of said part comprised of TiC, steps (d)-(e) form a second layer comprised of four zones of increasing nitrogen and decreasing carbon concentration toward the outer periphery, comprised of Ti(C,N) and step (g) forms a third layer comprised of Ti(N,B), and having, a grain size of about 1 um and about 0.5 um in the medium.
Claim 23
Dependent Claim
214 words
A process for coating a hardmetal disposable insert part, comprised of TiC, Ti(Nb)C, Co and the remainder WC, comprising the steps of: (a) inserting said part into a chamber for chemical vapor deposition process coating; (b) heating said chamber with an inert gas at atmospheric pressure; (c) introducing a first gas composition into said chamber, wherein said first gas composition comprises, H 2 , TiCl 4 , CH 4 and Ar; then (d) introducing a second gas composition into said chamber, wherein said second gas composition comprises, H 2 , TiCl 4 , N 2 , CH 4 and Ar; then (e) introducing said first gas composition into said chamber; then (f) introducing said second gas composition into said chamber; and (g) introducing a third gas composition into said chamber wherein said third gas composition comprises, H 2 , TiCl 4 , N 2 , and BCl 3 ; whereby step (c) forms a first layer on top of said part comprised of TiC, steps (d)-(e) form a second layer comprised of four zones of increasing nitrogen and decreasing carbon concentration toward the outer periphery, comprised of Ti(C,N) and step (g) forms a third layer comprised of Ti(N,B), and having, a grain size of about 1 um and about 0.5 um in the medium.
Claim 24
Dependent Claim
83 words
A process for coating a hardmetal disposable insert part, comprised of TiC, Ta(Nb)C, Co, and, the remainder WC, comprising the steps of: (a) inserting said part into a sputtering apparatus for physical vapor phase deposition process; (b) sputtering etching said part to clean the substrates; (c) applying about a 3 um thick TiN layer with a pure TiN target on said part; and (d) applying about a 7 um thick Ti(N,B) layer with a target comprised of titanium boronitride on said TiN layer.
Claim 25
Dependent Claim
83 words
A process for coating a hardmetal disposable insert part, comprised of TiC, Ta(Nb)C, Co, and, the remainder WC, comprising the steps of: (a) inserting said part into a sputtering apparatus for physical vapor phase deposition process; (b) sputtering etching said part to clean the substrates; (c) applying about a 3 um thick TiN layer with a pure TiN target on said part; and (d) applying about a 7 um thick Ti(N,B) layer with a target comprised of titanium boronitride on said TiN layer.
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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) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |