Refractory metal composite coated article
AssigneeBarson Corporation
InventorSeymour Priceman
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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.
Claims20
A method for coating a surface of a refractory metal to provide high temperature oxidation protection, comprising the steps of:
- (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 at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon.
A method for coating a surface of a refractory metal to provide high temperature oxidation protection, comprising the steps of:
- (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,
- (c) controlling the surface roughness of the intermetallic layer to at least about 160 micro-inches RMS to promote adherence of the ceramic layer thereon, and
- (d) oxidizing the intermetallic layer to form an oxide scale at the interface between the intermetallic layer and ceramic layer.
A method for coating a surface of a refractory metal to provide high temperature oxidation protection, comprising the steps of:
- (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 at least one of the temperature and time of heating in step (a) to form the intermetallic layer with a selected surface roughness that promotes adherence of the ceramic layer on the intermetallic layer.
A method for coating a surface of a refractory metal to provide high temperature oxidation protection, comprising the steps of:
- (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 thickness of the intermetallic layer formed in step (a) to provide a selected intermetallic layer surface roughness that promotes adherence of the ceramic layer on the intermetallic layer.
Dependencies are inferred from the claim text.