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US4812370A
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Surface coated tungsten carbide-base sintered hard alloy material for inserts of cutting tools
Assignee: Mitsubishi Metal Corp
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Filing: 1987-09-25
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Granted: 1989-03-14
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Expires: 2007-09-25
Abstract
Abstract A surface coated tungsten carbide-base sintered hard alloy material for inserts of cutting tools having excellent wear resistance and toughness comprising (1) a substrate having an internal portion consisting essentially of 5-30 percent by weight of one composite metal carbo-nitride, as a compound forming a hard dispersion phase, selected from the group consisting of (Ti, W)CN, (Ti, Nb, W)CN, (Ti, Ta, W)CN, and (Ti, Nb, Ta, W)CN; 4-10 percent Co as a component forming a binder phase, and the balance of WC as a component forming the hard disperse phase and inevitable impurities; the substrate having a surface portion formed with a Co-enriched layer being substantially free of the composite metal carbo-nitride; and (2) a hard surface layer coated over the surface of the substrate, comprising an innermost layer consisting essentially of TiC, the innermost layer containing one of a W component and W and Co components diffused from the substrate; a diffusion preventing layer formed by one of a single layer of one compound selected from the group consisting of TiCN and TiN, or a double layer of both of the components TiCN and TiN; an inner layer consisting essentially of TiC, the diffusion preventing layer preventing diffusion of one of the W component and the W and Co components into said inner layer; and an outer layer formed by one of a single layer of one compound selected from the group consisting of TiCO, TiCNO, and Al 2 O 3 and a double layer of two compounds selected from same.
Inventors
- 👤 Yoshikazu Okada
- 👤 Jun Sugawara
- 👤 Sumiyoshi Takizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:53
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; C23; C23C; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12146
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
276 words
A surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool, comprising: (1) a substrate formed of a tungsten carbide base sintered hard alloy having an internal portion consisting essentially of: 5-30 percent by weight of one composite metal carbo-nitride, as a compound forming a hard disperse phase, selected from the group consisting of (Ti, W)CN, (Ti, Nb, W)CN, (Ti, Ta, W)CN, and (Ti, Nb, Ta, W)CN; 4-10 percent Co as a component forming a binder phase, and the balance of WC as a component forming said hard disperse phase and inevitable impurities; said substrate having a surface portion formed with a Co-enriched layer being substantially free of said composite metal carbo-nitride; and (2) a hard surface layer coated over the surface of said substrate, comprising: an innermost layer consisting essentially of TiC, said innermost layer containing one of a W component and W and Co components diffused from said substrate; a diffusion preventing layer formed by one of a single layer of one compound selected from the group consisting of TiCN and TiN or a double layer of both of said compounds TiCN and TiN, said diffusion preventing layer preventing diffusion of one of said W component and said W and Co components; an inner layer consisting essentially of TiC; and an outer layer formed by one of a single layer of one compound selected from the group consisting of TiCO, TiCNO, and Al 2 O 3 and a double layer of two compounds selected from same; said innermost layer, said diffusion preventing layer, said inner layer, and said outer layer being superposed one upon another in the order mentioned.
Claim 2
Dependent Claim
276 words
A surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool, comprising: (1) a substrate formed of a tungsten carbide base sintered hard alloy having an internal portion consisting essentially of: 5-30 percent by weight of one composite metal carbo-nitride, as a compound forming a hard disperse phase, selected from the group consisting of (Ti, W)CN, (Ti, Nb, W)CN, (Ti, Ta, W)CN, and (Ti, Nb, Ta, W)CN; 4-10 percent Co as a component forming a binder phase, and the balance of WC as a component forming said hard disperse phase and inevitable impurities; said substrate having a surface portion formed with a Co-enriched layer being substantially free of said composite metal carbo-nitride; and (2) a hard surface layer coated over the surface of said substrate, comprising: an innermost layer consisting essentially of TiC, said innermost layer containing one of a W component and W and Co components diffused from said substrate; a diffusion preventing layer formed by one of a single layer of one compound selected from the group consisting of TiCN and TiN or a double layer of both of said compounds TiCN and TiN, said diffusion preventing layer preventing diffusion of one of said W component and said W and Co components; an inner layer consisting essentially of TiC; and an outer layer formed by one of a single layer of one compound selected from the group consisting of TiCO, TiCNO, and Al 2 O 3 and a double layer of two compounds selected from same; said innermost layer, said diffusion preventing layer, said inner layer, and said outer layer being superposed one upon another in the order mentioned.
Claim 3
Dependent Claim
52 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein the Co content in said Co-enriched layer is within a range from 5 to 30 percent by weight, which is higher than that in said internal portion of said substrate.
Claim 4
Dependent Claim
37 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein said Co-enriched layer has a mean thickness within a range from 5 to 30 microns.
Claim 5
Dependent Claim
37 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein said innermost layer has a mean thickness within a range from 0.5 to 3 microns.
Claim 6
Dependent Claim
38 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein said diffusion preventing layer has a mean thickness within a range from 0.5 to 3 microns.
Claim 7
Dependent Claim
37 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein said inner layer has a mean thickness within a range from 2 to 5 microns.
Claim 8
Dependent Claim
37 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein said outer layer has a mean thickness within a range from 0.3 to 3 microns.
Claim 9
Dependent Claim
129 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein the Co content in said Co-enriched layer is within a range from 5 to 30 percent by weight, which is higher than that in said internal portion of said substrate; said Co-enriched layer has a mean thickness within a range from 5 to 30 microns; said innermost layer has a mean thickness within a range from 0.5 to 3 microns; said diffusion preventing layer has a mean thickness within a range from 0.5 to 3 microns; said inner layer has a mean thickness within a range from 2 to 5 microns; and said outer layer has a mean thickness within a range from 0.3 to 3 microns.
Claim 10
Dependent Claim
129 words
The surface coated tungsten carbide-base sintered hard alloy material for an insert of a cutting tool as claimed in claim 1, wherein the Co content in said Co-enriched layer is within a range from 5 to 20 percent by weight, which is higher than that in said internal portion of said substrate; said Co-enriched layer has a mean thickness within a range from 10 to 20 microns; said innermost layer has a mean thickness within a range from 0.7 to 2 microns; said diffusion preventing layer has a mean thickness within a range from 1 to 2.5 microns; said inner layer has a mean thickness within a range from 3 to 4.5 microns; and said outer layer has a mean thickness within a range from 0.5 to 2.5 microns.
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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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |