US5075181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High hardness/high compressive stress multilayer coated tool
Assignee: Kennametal Inc
•
Filing: 1989-05-05
•
Granted: 1991-12-24
•
Expires: 2009-05-05
Abstract
Abstract A cutting tool is provided composed of a hard substrate having a PVD coating thereon having three layers. The innermost or first layer is composed of a group IVB (titanium, hafnium or zirconium) metal nitride. The middle or second layer is composed of a group IVB carbonitride. The outermost or third layer is also composed of a group IVB metal nitride. The PVD coating is characterized by high hardness and high residual compressive stresses.
Inventors
- 👤 Dennis T. Quinto
- 👤 Helmut J. Kaufmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:56
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/141; B23B27/145; B32; B32B; B32B27/00; B32B27/14; B32B15/00; B32B15/04; B32B18/00; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0641; C23C14/0664; C23C30/00; C23C30/005; B23B2222/00; B23B2222/16; B23B2222/28; B23B2222/84; B23B2228/00; B23B2228/36; C04; C04B; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6587; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/068; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/346; C04B2237/348; C04B2237/36; Y; Y10; Y10T; Y10T407/00; Y10T407/23; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
194 words
A cutting tool comprising: a body having a first face and a second face; a cutting edge located at the junction of said first face and said second face; said body composed of a substrate and a coating adherently bonded to said substrate; said substrate composed of a hard material selected from the group consisting of tool steels, cemented carbides and cermets; said coating having a first layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to said substrate; said coating have a second layer composed of a group IVB metal carbonitride deposited by physical vapor deposition and adherently bonded to the outside of said first layer; said coating having a third layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to the outside of said second layer; wherein said coating contains an average compressive residual stress exceeding about 350 Kg/mm 2 ; wherein said coating has an average Vickers Hardness Number (50 gm/load) between about 2600 to 3100 kg/mm 2 ; and wherein said first layer has a thickness exceeding 1 micrometer but which is less than 3 micrometers.
Claim 2
Dependent Claim
194 words
A cutting tool comprising: a body having a first face and a second face; a cutting edge located at the junction of said first face and said second face; said body composed of a substrate and a coating adherently bonded to said substrate; said substrate composed of a hard material selected from the group consisting of tool steels, cemented carbides and cermets; said coating having a first layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to said substrate; said coating have a second layer composed of a group IVB metal carbonitride deposited by physical vapor deposition and adherently bonded to the outside of said first layer; said coating having a third layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to the outside of said second layer; wherein said coating contains an average compressive residual stress exceeding about 350 Kg/mm 2 ; wherein said coating has an average Vickers Hardness Number (50 gm/load) between about 2600 to 3100 kg/mm 2 ; and wherein said first layer has a thickness exceeding 1 micrometer but which is less than 3 micrometers.
Claim 3
Dependent Claim
18 words
The cutting tool according to claim 1 wherein said compressive residual stress exceeds about 400 Kg/mm 2 .
Claim 4
Dependent Claim
21 words
The cutting tool according to claim 2 wherein said first layer has a thickness of about 1.5 to about 2.5 micrometers.
Claim 5
Dependent Claim
13 words
The cutting tool according to claim 1 wherein said substrate is cemented carbide.
Claim 6
Dependent Claim
15 words
The cutting tool according to claim 1 wherein said layer is composed of titanium nitride.
Claim 7
Dependent Claim
16 words
The cutting tool according to claim 3 wherein said third layer is composed of titanium nitride.
Claim 8
Dependent Claim
25 words
The cutting tool according to claim 1 wherein said second layer is composed of titanium carbonitride and said first layer is composed of titanium nitride.
Claim 9
Dependent Claim
25 words
The cutting tool according to claim 8 wherein said second layer is composed of titanium carbonitride and said first layer is composed of titanium nitride.
Claim 10
Dependent Claim
21 words
The cutting tool according to claim 1 wherein said average Vickers Hardness Number is about 2750 to 3100 kg/mm 2 .
Claim 11
Dependent Claim
21 words
The cutting tool according to claim 9 wherein said first layer has a thickness of about 1.5 to about 2.5 micrometers.
Claim 12
Dependent Claim
13 words
The cutting tool according to claim 9 wherein said substrate is cemented carbide.
Claim 13
Dependent Claim
16 words
The cutting tool according to claim 9 wherein said third layer is composed of titanium nitride.
Claim 14
Dependent Claim
16 words
The cutting tool according to claim 10 wherein said third layer is composed of titanium nitride.
Claim 15
Dependent Claim
25 words
The cutting tool according to claim 9 wherein said second layer is composed of titanium carbonitride and said first layer is composed of titanium nitride.
Claim 16
Dependent Claim
25 words
The cutting tool according to claim 12 wherein said second layer is composed of titanium carbonitride and said first layer is composed of titanium nitride.
Claim 17
Dependent Claim
23 words
The cutting tool according to claim 15 wherein said coating is characterized by an average compressive residual stress exceeding 400 kg/mm 2 .
Claim 18
Dependent Claim
250 words
A cutting tool comprising: a body having a first face and a second face; a cutting edge located at the junction of said first face and said second face; said body composed of a substrate and a coating adherently bonded to said substrate; said substrate composed of a hard material selected from the group consisting of tool steels, cemented carbides and cermets; said coating having a first layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to said substrate; said coating having a second layer composed of a group IVB metal carbonitride deposited by physical vapor deposition and adherently bonded to the outside of said first layer; said coating having a third layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to the outside of said second layer; wherein said coating has an average Vickers Hardness Number (50 gm/load) between about 2600 and 3100 Kg/mm 2 ; wherein said coating contains an average compression residual stress exceeding about 350 Kg/mm 2 ; wherein the compositions of the metal carbonitride in the second layer varies with distance from the substrate, such that as the second layer extends away from the substrate there is a first maximum and then a second maximum in the carbon content of the metal carbonitride and wherein between said first and second maximum, the carbon content of said metal carbonitride reaches a value which is less than the first maximum in carbon content.
Claim 19
Dependent Claim
250 words
A cutting tool comprising: a body having a first face and a second face; a cutting edge located at the junction of said first face and said second face; said body composed of a substrate and a coating adherently bonded to said substrate; said substrate composed of a hard material selected from the group consisting of tool steels, cemented carbides and cermets; said coating having a first layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to said substrate; said coating having a second layer composed of a group IVB metal carbonitride deposited by physical vapor deposition and adherently bonded to the outside of said first layer; said coating having a third layer composed of a group IVB metal nitride deposited by physical vapor deposition and adherently bonded to the outside of said second layer; wherein said coating has an average Vickers Hardness Number (50 gm/load) between about 2600 and 3100 Kg/mm 2 ; wherein said coating contains an average compression residual stress exceeding about 350 Kg/mm 2 ; wherein the compositions of the metal carbonitride in the second layer varies with distance from the substrate, such that as the second layer extends away from the substrate there is a first maximum and then a second maximum in the carbon content of the metal carbonitride and wherein between said first and second maximum, the carbon content of said metal carbonitride reaches a value which is less than the first maximum in carbon content.
Claim 20
Dependent Claim
25 words
The cutting tool according to claim 17 wherein the carbon content at the second maximum is greater than the carbon content at the first maximum.
References Cited (Backward Citations)
GB762931A
Cited
US4101703A
Cited
US4101703B1
Cited
US3900592A
Cited
US4035541A
Cited
US4169913A
Cited
GB1601224A
Cited
US4337300A
Cited
US4402994A
Cited
US4507189A
Cited
US4426267A
Cited
US4448802A
Cited
JPS58157965A
Cited
JPS5918474A
Cited
JPS5939784A
Cited
US4497874A
Cited
EP0191554A1
Cited
US4720437A
Cited
JPS6256564A
Cited
US4776863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |