Alpha alumina protective coatings for bond-coated substrates and their preparation
AssigneeGeneral Electric Company
InventorsRobert W. Bruce, Mark A. Rosenzweig, Bangalore A. Nagaraj, Jon C. Schaeffer, William B. Connor, David J. Wortman
Life of this patent
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Abstract
A bond-coated substrate is protected with an alpha alumina layer. The alpha alumina layer may be deposited as a relatively thick layer directly onto the bond-coated substrate. In this embodiment, no further ceramic layer overlies the alpha alumina layer. Other ceramics may be mixed into the alpha alumina layer, however. In another embodiment, a layer of a ceramic other than alpha alumina is deposited over the bond-coated substrate, and an alpha alumina layer is deposited over the ceramic layer.
Claims18
A method for preparing a protected article, comprising the steps of:
- providing a substrate;
- applying a bond coat to the substrate;
- and
- depositing a layer of alpha alumina by electron beam physical vapor deposition onto the bond-coated substrate, the step of depositing including the step of heating the bond-coated substrate to a temperature of at least about 1800.degree. F. while the alpha alumina is being deposited thereon.
A method for preparing a protected article, comprising the steps of:
- providing a substrate;
- applying a bond coat to the substrate;
- providing a deposition source of alpha alumina;
- and
- depositing a layer of alpha alumina from the deposition source of alpha alumina onto the substrate, the step of depositing including the step of heating the bond-coated substrate to a temperature of at least about 1800.degree. F. while the alpha alumina is being deposited thereon.
A method for preparing a protected article, comprising the steps of:
- providing a substrate;
- applying a bond coat to the substrate;
- providing a deposition source of alpha alumina;
- and
- depositing a layer of alpha alumina from the deposition source of alpha alumina onto the substrate, the step of depositing including the step of heating the bond-coated substrate to a temperature of at least about 1800.degree. F. while the alpha alumina is being deposited thereon, wherein the step of depositing a layer of alpha alumina includes the step of depositing the layer of alpha alumina from about 0.0001 inch to about 0.005 inch thick.
A method for preparing a protected article, comprising the steps of:
- providing a substrate;
- applying a bond coat to the substrate;
- providing a deposition source of alpha alumina;
- and
- depositing a layer of alpha alumina from the deposition source of alpha alumina onto the substrate, the step of depositing including the step of heating the bond-coated substrate to a temperature of at least about 1800.degree. F. while the alpha alumina is being deposited thereon, wherein the step of depositing a layer of alpha alumina includes the step of
- depositing the layer of alpha alumina from about 0.005 inch to about 0.010 inch thick.
Dependencies are inferred from the claim text.