US5277987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High hardness fine grained beta tungsten carbide
Assignee: Air Products and Chemicals Inc
•
Filing: 1991-02-01
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Granted: 1994-01-11
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Expires: 2011-02-01
Abstract
Abstract An extremely hard, fine grained tungsten carbide produced by thermochemical deposition is described. The tungsten carbide consists primarily of substantially pure tungsten carbide wherein the tungsten carbide consists of WC1-x, where x is 0 to about 0.4. The disclosed tungsten carbide is free of columnar grains and consists essentially of extremely fine, equiaxial crystals. Also disclosed is a method of producing the disclosed material.
Inventors
- 👤 Diwakar Garg
- 👤 Paul N. Dyer
- 👤 Robert E. Stevens
- 👤 Christopher Ceccarelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:02
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89; C23; C23C; C23C16/00; C23C16/06; C23C16/08; C23C16/14; C23C16/22; C23C16/30; C23C16/32; C23C30/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
62 words
A coated substrate comprising a substrate selected from the group consisting of ferrous and non-ferrous metals, alloys, graphite, cemented carbides and ceramics having a fine-grained coating thereon wherein said coating consists essentially of tungsten carbide characterized by the formula WC 1-x , where x ranges from 0 to about 0.4, said coating on said coated substrate being essentially free of columnar grains.
Claim 2
Dependent Claim
62 words
A coated substrate comprising a substrate selected from the group consisting of ferrous and non-ferrous metals, alloys, graphite, cemented carbides and ceramics having a fine-grained coating thereon wherein said coating consists essentially of tungsten carbide characterized by the formula WC 1-x , where x ranges from 0 to about 0.4, said coating on said coated substrate being essentially free of columnar grains.
Claim 3
Dependent Claim
17 words
The product according to claim 1 wherein said product consists essentially of fine, homogeneous and equiaxial grains.
Claim 4
Dependent Claim
77 words
The product according to claim 1 wherein said substrate is a metal or alloy which is reactive with process gases comprising (1) a tungsten halide, (2) a volatile oxygen- and hydrogen-containing organic compound containing from one to four carbon atoms, and (3) hydrogen and wherein an interlayer of a noble metal selected from the group consisting of nickel, cobalt, copper, silver, gold, platinum, rhodium, iridium and palladium is deposited between said substrate and said tungsten carbide phase.
Claim 5
Dependent Claim
26 words
The coated substrate according to claim 1 wherein the substrate is selected from the group consisting of copper, nickel, cobalt, silver, gold, molybdenum, rhenium and graphite.
Claim 6
Dependent Claim
120 words
A coated substrate comprising a substrate selected from the group consisting of ferrous and non-ferrous metals, alloys, graphite, cemented carbides and ceramics having a fine-grained coating on the substrate, wherein said coating consists essentially of a mixture of tungsten phase and a carbide phase wherein said carbide phase is selected from the group consisting of (1) W 2 C, (2) W 3 C, and (3) a mixture of W 2 C+W 3 C, and a fine-grained second coating on the coated substrate consisting essentially of a mixture of a tungsten carbide characterized by the formula WC 1-x , where x ranges from 0 to about 0.4, said second coating on said coating substrate product being essentially free of columnar grains.
Claim 7
Dependent Claim
120 words
A coated substrate comprising a substrate selected from the group consisting of ferrous and non-ferrous metals, alloys, graphite, cemented carbides and ceramics having a fine-grained coating on the substrate, wherein said coating consists essentially of a mixture of tungsten phase and a carbide phase wherein said carbide phase is selected from the group consisting of (1) W 2 C, (2) W 3 C, and (3) a mixture of W 2 C+W 3 C, and a fine-grained second coating on the coated substrate consisting essentially of a mixture of a tungsten carbide characterized by the formula WC 1-x , where x ranges from 0 to about 0.4, said second coating on said coating substrate product being essentially free of columnar grains.
Claim 8
Dependent Claim
33 words
The product according to claim 5 wherein a chemical vapor deposited coating of columnar tungsten is deposited on said substrate prior to said fine-grained coating of said tungsten phase and a carbide phase.
Claim 9
Dependent Claim
62 words
The product according to claim 6 wherein said substrate is a metal or alloy which is reactive with process gases comprising (1) a tungsten halide and (2) hydrogen and wherein an interlayer of a nobel metal selected from the group consisting of nickel, cobalt, copper, silver, gold, platinum, rhodium, iridium and palladium is deposited between said substrate and said columnar tungsten coating.
Claim 10
Dependent Claim
45 words
The product according to claim 5 wherein an interlayer of a nobel metal selected from the group consisting of nickel, cobalt, copper, silver, gold, platinum, rhodium, iridium and palladium is deposited between said substrate and said fine-grained coating of tungsten phase and a carbide phase.
Claim 11
Dependent Claim
16 words
The product according to claim 5 wherein said product consists essentially of homogeneous and equiaxial grains.
Claim 12
Dependent Claim
26 words
The coated substrate according to claim 5 wherein the substrate is selected from the group consisting of copper, nickel, cobalt, silver, gold, molybdenum, rhenium and graphite.
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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) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |