Patent US4889776A successfully refreshed from Google Patents.
US4889776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory metal composite coated article
Assignee: Barson Corp
•
Filing: 1987-08-17
•
Granted: 1989-12-26
•
Expires: 2007-08-17
Abstract
Abstract The coated article includes a refractory metal substrate having an oxidation resistant intermetallic layer formed in situ thereon; e.g., a fused refractory metal silicide layer, and a ceramic layer applied on and adhering to the intermetallic layer to provide enhanced high temperature properties and improved resistance to premature catastrophic failure in high temperature oxidizing environments where dissimilar materials are present that may destructively react with the intermetallic layer.
Inventors
- 👤 Seymour Priceman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:45
CPC Classifications
C; C23; C23C; C23C28/00; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/288; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; F05; F05D; F05D2300/00; F05D2300/50; F05D2300/504; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12771; Y10T428/12806; Y10T428/12819
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A coated article comprising a columbium substrate, an oxidation resistant intermetallic silicide layer fused in situ to the substrate and including by a reaction therewith an oxidation resistant columbium silicide compound, and a ceramic layer adhered to the intermetallic silicide layer and stable in high temperature oxidizing environments and at the interface with the silicide layer, said intermetallic silicide layer having a surface roughness of at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon.
Claim 2
Dependent Claim
79 words
A coated article comprising a columbium substrate, an oxidation resistant intermetallic silicide layer fused in situ to the substrate and including by a reaction therewith an oxidation resistant columbium silicide compound, and a ceramic layer adhered to the intermetallic silicide layer and stable in high temperature oxidizing environments and at the interface with the silicide layer, said intermetallic silicide layer having a surface roughness of at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon.
Claim 3
Dependent Claim
22 words
The coated article of claim 1 wherein the intermetallic silicide layer has a surface roughness of at least about 200 micro-inches RMS.
Claim 4
Dependent Claim
77 words
A coated article comprising a columbium substrate, an oxidation resistant, silicon-bearing intermetallic layer formed in-situ on the substrate and including by a reaction therewith an oxidation resistant, fused silicide of columbium, and a ceramic layer adhered to the intermetallic layer and stable in high temperature oxidizing environment and at the interface with the intermetallic layer, said intermetallic layer having a surface roughness of at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon.
Claim 5
Dependent Claim
77 words
A coated article comprising a columbium substrate, an oxidation resistant, silicon-bearing intermetallic layer formed in-situ on the substrate and including by a reaction therewith an oxidation resistant, fused silicide of columbium, and a ceramic layer adhered to the intermetallic layer and stable in high temperature oxidizing environment and at the interface with the intermetallic layer, said intermetallic layer having a surface roughness of at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon.
Claim 6
Dependent Claim
21 words
The coated article of claim 3 wherein the intermetallic layer has a surface roughness of at least about 200 micro-inches RMS.
References Cited (Backward Citations)
US2777254A
Cited
US2902392A
Cited
US3540863A
Cited
US4208453A
Cited
US3657784A
Cited
US3783013A
Cited
US3853524A
Cited
US4017674A
Cited
US4095003A
Cited
US4248940A
Cited
US4411936A
Cited
US4263058A
Cited
US4280975A
Cited
US4321310A
Cited
US4326011A
Cited
US4366571A
Cited
US4366571B1
Cited
US4595637A
Cited
US4588607A
Cited
US4668262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |