Patents by Inventor Curtis Alan Johnson

Curtis Alan Johnson has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6361878
    Abstract: A method of providing a roughened bond coat, for example in a thermal barrier coating system, comprises providing an oxidation-resistant plasma-sprayed layer onto a substrate and disposing a slurry overlayer on the oxidation-resistant plasma-sprayed layer. These steps form a roughened bond coat possessing an uneven, undulated, and irregular surface. A roughened bond coat in a thermal barrier coating system reduces de-bonding of the bond coat and a thermal barrier coating layer, which is desirable to maintain the insulation features of the thermal barrier coating system.
    Type: Grant
    Filed: February 20, 2001
    Date of Patent: March 26, 2002
    Assignee: General Electric Company
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson
  • Publication number: 20020009609
    Abstract: A roughened bond coat comprises a screen that includes interwoven wires defining openings and a metallic material disposed on the screen. The screen and metallic material form a roughened bond coat possessing an uneven, undulated, and irregular surface. The metallic material may be one of a slurry and a powder, and applied by coating and spraying, respectively. A thermal barrier coating system, which is formed with and incorporates the roughened bond coat, exhibits greater adhesion of a thermal barrier coating and bond coat due to an increased interfacial surface area provided by the uneven, undulated, and irregular surface.
    Type: Application
    Filed: June 4, 2001
    Publication date: January 24, 2002
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson
  • Publication number: 20020004142
    Abstract: A method of providing a roughened bond coat, for example in a thermal barrier coating system, comprises providing an oxidation-resistant plasma-sprayed layer onto a substrate and disposing a slurry overlayer on the oxidation-resistant plasma-sprayed layer. These steps form a roughened bond coat possessing an uneven, undulated, and irregular surface. A roughened bond coat in a thermal barrier coating system reduces de-bonding of the bond coat and a thermal barrier coating layer, which is desirable to maintain the insulation features of the thermal barrier coating system.
    Type: Application
    Filed: February 20, 2001
    Publication date: January 10, 2002
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson
  • Patent number: 6306517
    Abstract: An article having a spallation resistant TBC comprises a metal substrate, such as a high temperature superalloy, and a TBC, such as a coating of yttria stabilized zirconia. The TBC comprises a plurality of plasma-sprayed layers. The TBC has a coherent, continuous columnar grain microstructure, wherein at least one layer has a plurality of continuous columnar grains which have been extended by directional solidification into an adjacent layer.
    Type: Grant
    Filed: August 3, 2000
    Date of Patent: October 23, 2001
    Assignee: General Electric Company
    Inventors: Dennis Michael Gray, Yuk-Chiu Lau, Curtis Alan Johnson, Marcus Preston Borom, Warren Arthur Nelson
  • Patent number: 6294261
    Abstract: A method for smoothing the surface of a ceramic-based protective coating which exhibits roughness is disclosed. The method includes the steps of applying a ceramic-based slurry or gel coating to the protective coating surface; heating the slurry/gel coating to remove volatile material; and then further heating the slurry/gel coating to cure the coating and bond it to the underlying protective coating. The slurry/gel coating is often based on yttria-stabilized zirconia, and precursors of an oxide matrix. Related articles of manufacture are also described.
    Type: Grant
    Filed: October 1, 1999
    Date of Patent: September 25, 2001
    Assignee: General Electric Company
    Inventors: D. Sangeeta, Curtis Alan Johnson, Warren Arthur Nelson
  • Patent number: 6264766
    Abstract: A roughened bond coat comprises a screen that includes interwoven wires defining openings and a metallic material disposed on the screen. The screen and metallic material form a roughened bond coat possessing an uneven, undulated, and irregular surface. The metallic material may be one of a slurry and a powder, and applied by coating and spraying, respectively. A thermal barrier coating system, which is formed with and incorporates the roughened bond coat, exhibits greater adhesion of a thermal barrier coating and bond coat due to an increased interfacial surface area provided by the uneven, undulated, and irregular surface.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: July 24, 2001
    Assignee: General Electric Company
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson
  • Patent number: 6261643
    Abstract: A composite that protects thermal barrier coatings from the deleterious effects of environmental contaminants at operational temperatures is discovered. The thermal barrier coated parts have least two outer protective coatings that decrease infiltration of molten contaminant eutectic mixtures into openings in the thermal barrier coating.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: July 17, 2001
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Marcus Preston Borom, Curtis Alan Johnson
  • Patent number: 6242050
    Abstract: A method of providing a roughened bond coat, for example in a thermal barrier coating system, comprises providing an oxidation-resistant plasma-sprayed layer onto a substrate and disposing a slurry overlayer on the oxidation-resistant plasma-sprayed layer. These steps form a roughened bond coat possessing an uneven, undulated, and irregular surface. A roughened bond coat in a thermal barrier coating system reduces de-bonding of the bond coat and a thermal barrier coating layer, which is desirable to maintain the insulation features of the thermal barrier coating system.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: June 5, 2001
    Assignee: General Electric Company
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson
  • Patent number: 6180260
    Abstract: A method for providing a substantially-smooth protective coating on a metal-based substrate is disclosed. It comprises the steps of: (a) applying a thermal barrier coating over the substrate by plasma-spraying; (b) plasma-heating the applied coating according to a time- and temperature schedule sufficient to re-melt the surface region of the coating, allowing it to flow and smoothen; and then (c) cooling the surface region to a temperature below its melting point. The thermal barrier coating is often zirconia-based, e.g., yttria-stabilized zirconia. After being cooled, the surface is much smoother than when originally applied, thereby allowing the coating to be used in a higher-temperature environment.
    Type: Grant
    Filed: June 3, 1999
    Date of Patent: January 30, 2001
    Assignee: General Electric Company
    Inventors: Dennis Michael Gray, Wayne Charles Hasz, Timothy Francis Bethel, Curtis Alan Johnson, Marcus Preston Borom
  • Patent number: 6180184
    Abstract: An article having a spallation resistant TBC comprises a metal substrate, such as a high temperature superalloy, and a TBC, such as a coating of yttria stabilized zirconia. The TBC comprises a plurality of plasma-sprayed layers. The TBC has a coherent, continuous columnar grain microstructure, wherein at least one layer has a plurality of continuous columnar grains which have been extended by directional solidification into an adjacent layer. In a preferred embodiment, the coherent, continuous columnar microstructure comprises substantially all of the volume of TBC. A coherent, continuous columnar grain microstructure is also taught wherein at least some of the plurality of coherent, continuous columnar grains which comprise a TBC extend through essentially the entire thickness of the coating.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: January 30, 2001
    Assignee: General Electric Company
    Inventors: Dennis Michael Gray, Yuk-Chiu Lau, Curtis Alan Johnson, Marcus Preston Borom, Warren Arthur Nelson
  • Patent number: 6103315
    Abstract: A method for providing a substantially-smooth protective coating on a metal-based substrate is disclosed. A thermal barrier coating is first applied over the substrate by plasma-spraying. The coating is then plasma-heated according to a time- and temperature schedule sufficient to re-melt its surface region, allowing the coating material to flow and smoothen. The surface region is then allowed to cool to a temperature below its melting point. After being cooled, the surface is much smoother than when originally applied, which allows the coating to be used in a higher-temperature environment. The coating is often zirconia-based, e.g., yttria-stabilized zirconia.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: August 15, 2000
    Assignee: General Electric Co.
    Inventors: Dennis Michael Gray, Wayne Charles Hasz, Timothy Francis Bethel, Curtis Alan Johnson, Marcus Preston Borom
  • Patent number: 6022594
    Abstract: A method for improving the quality of a zirconia-based coating deposited on a metal-based substrate is disclosed. The method comprises the step of plasma-spraying zirconia powder of substantially uniform particle size onto the substrate. The disclosure further relates to an improved powder source material for use in a plasma. The source material is zirconia powder having a uniform particle size, and optionally, a uniform particle density. The use of such a material results in improved thermal barrier coatings for various substrates, such as those found in a turbine engine.
    Type: Grant
    Filed: February 27, 1998
    Date of Patent: February 8, 2000
    Assignee: General Electric Company
    Inventors: Marcus Preston Borom, Lawrence Edward Szala, Curtis Alan Johnson, Yuk-Chiu Lau, Dennis Michael Gray
  • Patent number: 5989343
    Abstract: A method and apparatus form a thermal barrier coating on a metal component. A molten thermal barrier coating powder is sprayed on the component in sweeping strokes. A plurality of overlapping solidified coating ribbons are deposited on the component and include a sequentially deposited surface ribbon forming sublayer ribbons therebelow. The surface ribbon is preheated at a spray site so that the sprayed molten powder remelts the surface ribbon at the spray site for sequentially welding the sequentially deposited surface ribbons to the sublayer ribbons.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: November 23, 1999
    Assignee: General Electric Company
    Inventors: Marcus Preston Borom, Dennis Michael Gray, Curtis Alan Johnson
  • Patent number: 5914189
    Abstract: A composite that protects thermal barrier coatings from the deleterious effects of environmental contaminants at operational temperatures is discovered. The thermal barrier coated parts have least two outer protective coatings that decrease infiltration of molten contaminant eutectic mixtures into openings in the thermal barrier coating.
    Type: Grant
    Filed: April 8, 1997
    Date of Patent: June 22, 1999
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Marcus Preston Borom, Curtis Alan Johnson
  • Patent number: 5897921
    Abstract: A method and apparatus form a thermal barrier coating on a metal component. A molten thermal barrier coating powder is sprayed on the component in sweeping strokes. A plurality of overlapping solidified coating ribbons are deposited on the component and include a sequentially deposited surface ribbon forming sublayer ribbons therebelow. The surface ribbon is preheated at a spray site so that the sprayed molten powder remelts the surface ribbon at the spray site for sequentially welding the sequentially deposited surface ribbons to the sublayer ribbons.
    Type: Grant
    Filed: January 24, 1997
    Date of Patent: April 27, 1999
    Assignee: General Electric Company
    Inventors: Marcus Preston Borom, Dennis Michael Gray, Curtis Alan Johnson
  • Patent number: 5871820
    Abstract: A method is provided for protecting thermal barrier coatings deposited on parts from the deleterious effects of environmental contaminants at operating temperatures. The method uses an impermeable barrier coating with the thermal barrier coating, where the impermeable barrier coating prevents environmental contaminants and resulting contaminant compositions from infiltrating openings in thermal barrier coatings during service at operating temperatures.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: February 16, 1999
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Marcus Preston Borom, Curtis Alan Johnson
  • Patent number: 5851678
    Abstract: A composite that protects thermal barrier coatings on parts from the deleterious effects of environmental contaminants at operating temperatures with an impermeable barrier coating is divulged. The thermal barrier coating composite decreases infiltration of molten contaminant compositions into openings in the thermal barrier coating to increase the life of the composite.
    Type: Grant
    Filed: April 11, 1996
    Date of Patent: December 22, 1998
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Marcus Preston Borom, Curtis Alan Johnson
  • Patent number: 5830586
    Abstract: An article having a spallation resistant TBC comprises a metal substrate, such as a high temperature superalloy, and a TBC, such as a coating of yttria stabilized zirconia. The TBC comprises a plurality of plasma-sprayed layers. The TBC has a coherent, continuous columnar grain microstructure, wherein at least one layer has a plurality of continuous columnar grains which have been extended by directional solidification into an adjacent layer. In a preferred embodiment, the coherent, continuous columnar microstructure comprises substantially all of the volume of TBC. A coherent, continuous columnar grain microstructure is also taught wherein at least some of the plurality of coherent, continuous columnar grains which comprise a TBC extend through essentially the entire thickness of the coating.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: November 3, 1998
    Assignee: General Electric Company
    Inventors: Dennis Michael Gray, Yuk-Chiu Lau, Curtis Alan Johnson, Marcus Preston Borom, Warren Arthur Nelson
  • Patent number: 5773141
    Abstract: A composite that protects thermal barrier coatings on parts from the deleterious effects of environmental contaminants at operating temperatures with a sacrificial oxide coating is divulged. The thermal barrier coating composite decreases infiltration of molten contaminant compositions into openings in the thermal barrier coating to increase the life of the composite.
    Type: Grant
    Filed: June 19, 1996
    Date of Patent: June 30, 1998
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Marcus Preston Borom, Curtis Alan Johnson
  • Patent number: 5660885
    Abstract: A method for protecting thermal barrier coatings deposited on engine parts from the deleterious effects of environmental contaminants at high temperatures is given. The method uses a sacrificially consumed oxide coating with the thermal barrier coating, where the consumption of the oxide coating increases the melting temperature of a contaminant composition above the surface temperature of the thermal barrier coating, or increases the viscosity of the contaminant composition to prevent its infiltration into the thermal barrier coating.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: August 26, 1997
    Assignee: General Electric Company
    Inventors: Wayne Charles Hasz, Curtis Alan Johnson, Marcus Preston Borom