Patent US404284A successfully refreshed from Google Patents.
Patent US4409003A successfully refreshed from Google Patents.
US4409003A
Expired / Lapsed
US
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Carbonitride coated silicon nitride cutting tools
Assignee: Verizon Laboratories Inc
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Filing: 1982-05-20
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Granted: 1983-10-11
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Expires: 2002-05-20
Abstract
Abstract Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of a refractory metal carbonitride. The silicon nitride substrate body consists essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.
Inventors
- 👤 Vinod K. Sarin
- 👤 Sergej-Tomislav Buljan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:26
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/80; C04B41/81; C04B41/85; C04B41/87; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A coated ceramic cutting tool comprising a densified silicon nitride substrate body having at least one adherent coating layer; said substrate body consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof; said adherent coating layer consisting essentially of a material selected from the refractory metal carbonitrides.
Claim 2
Dependent Claim
88 words
A coated ceramic cutting tool comprising a densified silicon nitride substrate body having at least one adherent coating layer; said substrate body consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof; said adherent coating layer consisting essentially of a material selected from the refractory metal carbonitrides.
Claim 3
Dependent Claim
42 words
A coated ceramic cutting tool in accordance with claim 1 wherein said refractory metal carbonitride coating is selected from the group consisting of titanium carbonitride, vanadium carbonitride, chromium carbonitride, zirconium carbonitride, niobium carbonitride, molybdenum carbonitride, hafnium carbonitride, tantalum carbonitride, and tungsten carbonitride.
Claim 4
Dependent Claim
22 words
A coated ceramic cutting tool in accordance with claim 2 wherein said refractory metal carbonitride coating comprises titanium carbonitride or hafnium carbonitride.
Claim 5
Dependent Claim
25 words
A coated ceramic cutting tool in accordance with claim 1 wherein said coating layer is of a thickness between about 0.1 microns and 10 microns.
Claim 6
Dependent Claim
25 words
A coated ceramic cutting tool in accordance with claim 4 wherein said coating layer is of a thickness between about 1.0 and about 10 microns.
Claim 7
Dependent Claim
29 words
A coated ceramic cutting tool in accordance with claim 2 wherein the carbon to nitrogen ratio is said refractory metal carbonitride coating ranges between about 1.0 and about 1.5.
Claim 8
Dependent Claim
32 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid is present in an amount of between about 1 and about 25 weight percent of said substrate body.
Claim 9
Dependent Claim
32 words
A coated ceramic cutting tool in accordance with claim 7 wherein said densification aid is present in an amount of between about 1 and about 5 weight percent of said substrate body.
Claim 10
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 8 wherein said densification aid comprises silicon dioxide.
Claim 11
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid comprises magnesium oxide.
Claim 12
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid comprises aluminum oxide.
Claim 13
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid comprises yttrium oxide.
Claim 14
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid comprises hafnium oxide.
Claim 15
Dependent Claim
17 words
A coated ceramic cutting tool in accordance with claim 1 wherein said densification aid comprises zirconium oxide.
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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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |