Patent US5266388A successfully refreshed from Google Patents.
US5266388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Binder enriched coated cutting tool
Assignee: Kennametal Inc
•
Filing: 1991-08-29
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Granted: 1993-11-30
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Expires: 2011-08-29
Abstract
Abstract Provided is a coated cutting tool having a binder enriched substrate. The coating includes at least one CVD layer which may be in a state of residual tensile stress and at least one layer in a state of residual compressive stress.
Inventors
- 👤 Anakkavur T. Santhanam
- 👤 Rajendra V. Godse
- 👤 George P. Grab
- 👤 Dennis T. Quinto
- 👤 Kenneth E. Undercoffer
- 👤 Prem C. Jindal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:30
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23B; B23B27/00; B23B27/14; B23B27/148; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C23; C23C; C23C30/00; C23C30/005; B22; B22F; B22F2998/00; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
156 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate, wherein said coating is bonded to said substrate; wherein said substrate is a cemented carbide having hard refractory grains bonded together by a binder material; wherein the binder material is cobalt or a cobalt alloy; wherein the concentration of said binder material is greater near a peripheral boundary of said substrate than the binder concentration is away from the peripheral boundary of the substrate; said coating having a number of hard refractory layers; said hard refractory layers including a first layer which is a chemical vapor deposition layer and a second layer in a state of residual compressive stress; wherein said chemical vapor deposition layer is located adjacent to the substrate; and wherein said compressive residual stress exceeds 60 kg/cm 2 .
Claim 2
Dependent Claim
156 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate, wherein said coating is bonded to said substrate; wherein said substrate is a cemented carbide having hard refractory grains bonded together by a binder material; wherein the binder material is cobalt or a cobalt alloy; wherein the concentration of said binder material is greater near a peripheral boundary of said substrate than the binder concentration is away from the peripheral boundary of the substrate; said coating having a number of hard refractory layers; said hard refractory layers including a first layer which is a chemical vapor deposition layer and a second layer in a state of residual compressive stress; wherein said chemical vapor deposition layer is located adjacent to the substrate; and wherein said compressive residual stress exceeds 60 kg/cm 2 .
Claim 3
Dependent Claim
33 words
The cutting tool according to claim 1 wherein said first layer includes a layer composed of a hard nitride selected from the group consisting of Ti, Hf, Zr, their solid solutions and mixtures.
Claim 4
Dependent Claim
21 words
The cutting tool according to claim 2 wherein said hard nitride layer is titanium nitride and is adjacent to said substrate.
Claim 5
Dependent Claim
37 words
The cutting tool according to claim 1 wherein said first layer includes a layer composed of a hard carbonitride selected from the group consisting of the carbonitrides of Ti, Hf, Zr and their solid solutions and mixtures.
Claim 6
Dependent Claim
54 words
The cutting tool according to claim 3 further comprising a third layer which is a CVD layer composed of a hard carbonitride selected from the group consisting of the carbonitrides of Ti, Hf, Zr and their solid solutions and mixtures, and wherein said third layer is between said first layer and said second layer.
Claim 7
Dependent Claim
29 words
The cutting tool according to claim 1 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf and their alloys.
Claim 8
Dependent Claim
29 words
The cutting tool according to claim 2 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf and their alloys.
Claim 9
Dependent Claim
28 words
The cutting tool according to claim 3 wherein said second tool selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf and their alloys.
Claim 10
Dependent Claim
29 words
The cutting tool according to claim 4 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf and their alloys.
Claim 11
Dependent Claim
29 words
The cutting tool according to claim 5 wherein said second layer is selected from the group consisting of the nitrides and carbonitrides of Ti, Zr, Hf and their alloys.
Claim 12
Dependent Claim
149 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate; wherein said substrate is a tungsten carbide based cemented carbide having a bulk composition including 0-12 weight percent Ta, 0-6 weight percent Nb, 0.0-10 weight percent Ti, and 3-12 weight percent Co; wherein the cobalt concentration is enriched in a zone near a peripheral boundary of said substrate; said zone having a maximum cobalt concentration of 125 percent to 300 percent of the bulk substrate cobalt concentration; said coating having a number of hard refractory layers; said hard refractory layers including a first layer which is a CVD layer adjacent to said substrate and a second layer in a state of residual compressive stress; and wherein said compressive residual stress exceeds 130 kg/mm 2 .
Claim 13
Dependent Claim
149 words
A cutting tool comprising: a rake face and a flank face; a cutting edge at a junction of said rake face and said flank face; said cutting tool having a coating and a substrate; wherein said substrate is a tungsten carbide based cemented carbide having a bulk composition including 0-12 weight percent Ta, 0-6 weight percent Nb, 0.0-10 weight percent Ti, and 3-12 weight percent Co; wherein the cobalt concentration is enriched in a zone near a peripheral boundary of said substrate; said zone having a maximum cobalt concentration of 125 percent to 300 percent of the bulk substrate cobalt concentration; said coating having a number of hard refractory layers; said hard refractory layers including a first layer which is a CVD layer adjacent to said substrate and a second layer in a state of residual compressive stress; and wherein said compressive residual stress exceeds 130 kg/mm 2 .
Claim 14
Dependent Claim
21 words
The cutting tool according to claim 1 wherein an outermost layer is said layer in a state of residual compressive stress.
Claim 15
Dependent Claim
18 words
The cutting tool according to claim 1 wherein said second layer is an outermost layer of said coating.
Claim 16
Dependent Claim
21 words
The cutting tool according to claim 1 wherein said second layer has a compressive residual stress exceeds 130 kg/mm 2 .
Claim 17
Dependent Claim
26 words
The cutting tool according to claim 1 wherein said second layer has a compressive residual stress of between about 60 to about 340 kg/mm 2 .
Claim 18
Dependent Claim
25 words
The cutting tool according to claim 1 wherein the second layer has a compressive residual stress between about 130 to about 270 kg/mm 2 .
Claim 19
Dependent Claim
25 words
The cutting tool according to claim 11 wherein the second layer has a compressive residual stress between about 130 to about 270 kg/mm 2 .
Claim 20
Dependent Claim
19 words
The cutting tool according to claim 1 wherein the second layer is characterized by an absence of thermal cracks.
Claim 21
Dependent Claim
19 words
The cutting tool according to claim 11 wherein the second layer is characterized by an absence of thermal cracks.
Claim 22
Dependent Claim
31 words
The cutting tool according to claim 1 wherein the concentration of said cobalt near said peripheral boundary is 150 to 300 percent of the cobalt concentration away from said peripheral boundary.
Claim 23
Dependent Claim
25 words
The cutting tool according to claim 11 wherein the maximum concentration of said cobalt is 200 to 300 percent of the bulk substrate cobalt concentration.
Claim 24
Dependent Claim
16 words
The cutting tool according to claim 20 wherein said cutting edge is in a sharp condition.
Claim 25
Dependent Claim
16 words
The cutting tool according to claim 21 wherein said cutting edge is in a sharp condition.
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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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |