Low-sulfur article coated with a platinum-group metal and a ceramic layer, and its preparation
AssigneeGeneral Electric Company
InventorsJon C. Schaeffer, Mark A. Rosenzweig, Norman R. Lindblad, Wendy H. Murphy
Life of this patent
Estimating the term…
Abstract
A coated article is prepared by furnishing an article substrate having a free sulfur content of less than about 1 part per million. The low-sulfur article may be made of a material selected to have a low sulfur content, provided with a scavenging element that reacts with free sulfur to produce a sulfur compound, or desulfurized by contact with a reducing gas such as hydrogen. A platinum-group metal layer is deposited over the article substrate, and a ceramic coating is applied over the platinum-group metal layer.
Claims16
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate formed of a nickel-based superalloy and having a free sulfur content of less than about 1 part per million;
- depositing a layer of a platinum-group metal over the article substrate;
- and applying a ceramic coating over the layer of a platinum-group metal.
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate having a free sulfur content of less than about 1 part per million, wherein the step of furnishing includes the step of
- providing the article substrate having more than about 1 part per million of free sulfur, and
- processing the article substrate to reduce the free sulfur level to less than about 1 part per million, wherein the step of processing includes the step of contacting the article substrate to a reducing gas at elevated temperature;
- depositing a layer of a platinum-group metal over the article substrate;
- and
- applying a ceramic coating over the layer of a platinum-group metal.
A method for preparing a coated article, comprising the steps of:
- furnishing an article substrate made of a nickel-base superalloy and having a local free sulfur content of less than about 1 part per million in a selected region;
- depositing a platinum-group metal layer over the selected region of the article substrate;
- and
- applying a ceramic coating over the platinum-group metal layer in the selected region of the article substrate.
A coated article, comprising:
- an article substrate comprising a nickel-base superalloy and having a sulfur content of less than about 1 part per million;
- a platinum-group metal layer overlying the article substrate;
- and
- a ceramic coating overlying the platinum-group metal layer.
Dependencies are inferred from the claim text.