US4892792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A1N coated silicon nitride based cutting tools
Assignee: Valenite LLC
•
Filing: 1988-08-12
•
Granted: 1990-01-09
•
Expires: 2008-08-12
Abstract
Abstract Cutting tools, cutting tool inserts, and wear parts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or wear conditions comprising a monolithic or composite silicon nitride-based substrate having a hard adherent coating layer of a refractory aluminum nitride, and optionally an outer adherent coating layer of a refractory material. The preferred outer layer refractory materials are the carbides, nitrides, and carbonitrides of Ti, Zr, Hf, Nb, V, Ta, Cr, Mo, and W, and mixtures and solid solutions thereof, alumina and zirconia.
Inventors
- 👤 Vinod K. Sarin
- 👤 Charles D'Angelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/5063; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
31 words
A wear resistant coated article comprising a densified monolithic or composite silicon nitride-based substrate body having an adherent refractory coating layer deposited thereon, the coating layer consisting essentially of aluminum nitride.
Claim 2
Dependent Claim
31 words
A wear resistant coated article comprising a densified monolithic or composite silicon nitride-based substrate body having an adherent refractory coating layer deposited thereon, the coating layer consisting essentially of aluminum nitride.
Claim 3
Dependent Claim
42 words
A wear resistant coated article according to claim 1 further comprising at least one outer adherent coating layer of a refractory material having a different chemical composition from that of the aluminum nitride coating layer, deposited on the aluminum nitride coating layer.
Claim 4
Dependent Claim
36 words
A wear resistant coated article according to claim 2 wherein the outer adherent refractory coating layer comprises titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, chromium carbide, molybdenum carbide, or tungsten carbide.
Claim 5
Dependent Claim
36 words
A wear resistant coated article according to claim 2 wherein the outer adherent refractory coating layer comprises titanium nitride, zirconium nitride, hafnium nitride, vanadium nitride, niobium nitride, tantalum nitride, chromium nitride, molybdenum nitride, or tungsten nitride.
Claim 6
Dependent Claim
36 words
A wear resistant coated article according to claim 2 wherein the outer adherent refractory coating layer comprises titanium carbonitride, zirconium carbonitride, hafnium carbonitride, vanadium carbonitride, niobium carbonitride, tantalum carbonitride, chromium carbonitride, molybdenum carbonitride, or tungsten carbonitride.
Claim 7
Dependent Claim
20 words
A wear resistant coated article according to claim 2 wherein the outer adherent refractory coating layer comprises alumina or zirconia.
Claim 8
Dependent Claim
28 words
A wear resistant coated article according to claim 1 wherein the adherent aluminum nitride coating layer is of a thickness between about 0.1 microns and about 10 microns.
Claim 9
Dependent Claim
26 words
A wear resistant coated article according to claim 2 wherein the outer adherent coating layer is of a thickness between about 1.0 and about 10 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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |