Patent EP0304176A2 successfully refreshed from Google Patents.
EP0304176A2
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EP
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Refractory metal composite coated article
Assignee: Barson Corp
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Filing: 1988-07-26
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Granted: —
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Expires: 2008-07-26
Abstract
Abstract The coated article includes a refractory metal substrate (2) having an oxidation resistant intermetallic layer (4) formed in situ thereon; e.g., a fused refractory metal silicide containing layer (4), and a ceramic layer (6) applied on and adhering to the intermetallic layer (4) to provide enhanced high temperature properties and resistance to premature catastrophic failure in high temperature oxidizing environments where materials are present that may destructively react with the intermetallic layer (4). The refractory metal substrate (2) may be coated on only one side or on both sides by the said intermetallic-ceramic layer system.
Inventors
- 👤 Seymour Priceman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:50
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: 27
Claim 1
Independent Claim
64 words
A coated article characterised in that it comprises a substrate of a refractory metal, an oxidation resistant intermetallic layer formed in situ on the substrate to include by a reaction therewith an oxidation resistant intermetallic compound of the refractory metal, and a ceramic layer adhered to the intermetallic layer and stable in high temperature oxidizing environments and at the interface with the intermetallic layer.
Claim 2
Dependent Claim
64 words
A coated article characterised in that it comprises a substrate of a refractory metal, an oxidation resistant intermetallic layer formed in situ on the substrate to include by a reaction therewith an oxidation resistant intermetallic compound of the refractory metal, and a ceramic layer adhered to the intermetallic layer and stable in high temperature oxidizing environments and at the interface with the intermetallic layer.
Claim 3
Dependent Claim
26 words
A coated article according to claim 1 characterised in that the said ceramic layer has an emissivity of radiation greater than that of the intermetallic layer.
Claim 4
Dependent Claim
23 words
A coated article according to claim 1 or claim 2 characterised in that the intermetallic layer is fused in situ to the substrate.
Claim 5
Dependent Claim
29 words
A coated article according to any of the preceding claims characterised in that the intermetallic layer is a silicon-bearing layer including an oxidation resistant silicide of the refractory metal.
Claim 6
Dependent Claim
25 words
A coated article according to any of the preceding claims characterised in that the refractory metal is selected from columbium, molybdenum, tantalum, rhenium and tungsten.
Claim 7
Dependent Claim
33 words
A coated article according to any of the preceding claims characterised in that the ceramic layer has a thickness to provide a thermal barrier between the intermetallic layer and high temperature oxidizing environment.
Claim 8
Dependent Claim
24 words
A coated article according to claim 6 characterised in that the thickness of the ceramic layer is about 5 mils to about 40 mils.
Claim 9
Dependent Claim
31 words
A coated article according to any of claims 1 to 5 characterised in that the ceramic layer has a thickness to provide a chemical/metallurgical barrier between the intermetallic layer and environment.
Claim 10
Dependent Claim
24 words
A coated article according to claim 8 characterised in that the thickness of the ceramic layer is about 3 mils to about 6 mils.
Claim 11
Dependent Claim
29 words
A coated article according to any of claims 1 to 5 characterised in that the ceramic layer has a thickness to provide erosion and wear resistance in the environment.
Claim 12
Dependent Claim
24 words
A coated article according to claim 10 characterised in that the ceramic layer has a thickness of about 3 mils to about 10 mils.
Claim 13
Dependent Claim
24 words
A coated article according to claim 2 characterised in that the thickness of the ceramic layer is about 1/2 mil to about 3 mils.
Claim 14
Dependent Claim
97 words
An engine component combination for use in an engine using a gas flow past an upstream engine components toward a downstream engine component operating at elevated temperature, characterised in that the downstream component comprises a substrate and the upstream component comprises a material potentially destructively reactive with said intermetallic layer so as to degrade the same when in contact therewith at elevated temperature, said ceramic layer providing a barrier between said intermetallic layer and said material in the event said material comes in contact with said downstream component so as to prevent degradation of said intermetallic layer.
Claim 15
Dependent Claim
97 words
An engine component combination for use in an engine using a gas flow past an upstream engine components toward a downstream engine component operating at elevated temperature, characterised in that the downstream component comprises a substrate and the upstream component comprises a material potentially destructively reactive with said intermetallic layer so as to degrade the same when in contact therewith at elevated temperature, said ceramic layer providing a barrier between said intermetallic layer and said material in the event said material comes in contact with said downstream component so as to prevent degradation of said intermetallic layer.
Claim 16
Dependent Claim
25 words
A combination according to claim 13 characterised in that the downstream component is a coated article as claimed in any of claims 1 to 12.
Claim 17
Dependent Claim
36 words
A combination according to claim 13 or claim 14 characterised in that the upstream component includes a metal which is chemically or metallurgically reactive with the silicide of the refractory metal so as to degrade it.
Claim 18
Dependent Claim
24 words
A combination according to any of claims 13 to 15 characterised in that the ceramic layer is selected from alumina, ceria, zirconia and yttria.
Claim 19
Independent Claim
94 words
A method for coating a surface of a refractory metal to provide high temperature oxidation protection characterised in that the method comprises: (a) forming an oxidation resistant intermetallic layer on the refractory metal by applying a reactive metallic material to said surface and heating said refractory metal and metallic material to a temperature and for a time to form the intermetallic layer in situ on said surface, (b) applying a ceramic layer to the intermetallic layer, and (c) controlling the surface roughness of the intermetallic layer to promote adherence of the ceramic layer thereon.
Claim 20
Independent Claim
94 words
A method for coating a surface of a refractory metal to provide high temperature oxidation protection characterised in that the method comprises: (a) forming an oxidation resistant intermetallic layer on the refractory metal by applying a reactive metallic material to said surface and heating said refractory metal and metallic material to a temperature and for a time to form the intermetallic layer in situ on said surface, (b) applying a ceramic layer to the intermetallic layer, and (c) controlling the surface roughness of the intermetallic layer to promote adherence of the ceramic layer thereon.
Claim 21
Dependent Claim
25 words
A method according to claim 17 characterised in that the surface roughness is controlled to be in range of about 160 to about 300 micro-inches.
Claim 22
Dependent Claim
24 words
A method according to claim 17 characterised in that the surface roughness is controlled to be in range of about 200 to 300 micro-inches.
Claim 23
Independent Claim
50 words
A method according to any of claims 17 to 19 characterised in that the surface roughness of the intermetallic layer is controlled by roughening the surface of the refractory metal, by controlling the temperature and/or time for forming the intermetallic layer, or by controlling the thickness of the intermetallic layer.
Claim 24
Independent Claim
29 words
A method according to any of claims 17 to 20 characterised in that the thickness of the ceramic layers is defined as in any of claims 6 to 12.
Claim 25
Independent Claim
42 words
A method according to any of claims 17 to 21 characterised in that the reactive metallic material applied in step (a) includes silicon and the silicon reacts with the refractory metal to form a fused oxidation resistant silicide of the refractory metal.
Claim 26
Independent Claim
33 words
A method according to any of claims 17 to 22 characterised in that the intermetallic layer is oxidised to form an oxide scale at the interface between the intermetallic layer and ceramic layer.
Claim 27
Independent Claim
35 words
A method according to any of claims 17 to 23 characterised in that the oxidizing of the intermetallic layer is conducted after the ceramic layer is applied to form an oxide scale at the interface.
References Cited (Backward Citations)
No citation records indexed.
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