Patents by Inventor William Scott Walston

William Scott Walston 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: 7910173
    Abstract: A thermal barrier coating and deposition process for a component intended for use in a hostile thermal environment, such as the turbine, combustor and augmentor components of a gas turbine engine. The TBC has a first coating portion on at least a first surface portion of the component. The first coating portion is formed of a ceramic material to have at least an inner region, at least an outer region overlying the inner region, and a columnar microstructure whereby the inner and outer regions comprise columns of the ceramic material. The columns of the inner region are more closely spaced than the columns of the outer region so that the inner region of the first coating portion is denser than the outer region of the first coating portion, wherein the higher density of the inner region promotes the impact resistance of the first coating portion.
    Type: Grant
    Filed: July 31, 2008
    Date of Patent: March 22, 2011
    Assignee: General Electric Company
    Inventors: Irene Spitsberg, Brett Allen Rohrer Boutwell, Robert William Bruce, Curtis Alan Johnson, Bangalore Aswatha Nagaraj, William Scott Walston, Rudolfo Viguie, Joshua Leigh Miller, Roger Dale Wustman
  • Patent number: 7597966
    Abstract: A thermal barrier coating and deposition process for a component intended for use in a hostile thermal environment, such as the turbine, combustor and augmentor components of a gas turbine engine. The TBC has a first coating portion on at least a first surface portion of the component. The first coating portion is formed of a ceramic material to have at least an inner region, at least an outer region overlying the inner region, and a columnar microstructure whereby the inner and outer regions comprise columns of the ceramic material. The columns of the inner region are more closely spaced than the columns of the outer region so that the inner region of the first coating portion is denser than the outer region of the first coating portion, wherein the higher density of the inner region promotes the impact resistance of the first coating portion.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: October 6, 2009
    Assignee: General Electric Company
    Inventors: Irene Spitsberg, Brett Allen Rohrer Boutwell, Robert William Bruce, Curtis Alan Johnson, Bangalore Aswatha Nagaraj, William Scott Walston
  • Patent number: 7510779
    Abstract: A coated article is prepared by furnishing a nickel-base article substrate having a free sulfur content of more than 0 but less than about 1 part per million by weight. A protective layer is formed at a surface of the article substrate. The protective layer includes a platinum aluminide diffusion coating. The protective layer may be substantially yttrium-free, or have a controlled amount of yttrium. A ceramic layer may overlie the protective layer.
    Type: Grant
    Filed: September 17, 2004
    Date of Patent: March 31, 2009
    Assignee: General Electric Company
    Inventors: William Scott Walston, Jon Conrad Schaeffer, Wendy Howard Murphy
  • Publication number: 20080305264
    Abstract: A thermal barrier coating and deposition process for a component intended for use in a hostile thermal environment, such as the turbine, combustor and augmentor components of a gas turbine engine. The TBC has a first coating portion on at least a first surface portion of the component. The first coating portion is formed of a ceramic material to have at least an inner region, at least an outer region overlying the inner region, and a columnar microstructure whereby the inner and outer regions comprise columns of the ceramic material. The columns of the inner region are more closely spaced than the columns of the outer region so that the inner region of the first coating portion is denser than the outer region of the first coating portion, wherein the higher density of the inner region promotes the impact resistance of the first coating portion.
    Type: Application
    Filed: July 31, 2008
    Publication date: December 11, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Irene Spitsberg, Brett Allen Rohrer Boutwell, Robert William Bruce, Curtis Alan Johnson, Bangalore Aswatha Nagaraj, William Scott Walston, Rudolfo Viguie, Joshua Leigh Miller, Roger D. Wustman
  • Patent number: 7288328
    Abstract: An article for use in hostile thermal environments, such as a component of a gas turbine engine. The article includes a nickel-base superalloy substrate that is prone to formation of a deleterious secondary reaction zone (SRZ), and an overlay coating having a predominantly gamma prime-phase nickel aluminide (Ni3Al) composition suitable for use as an environmental coating, including a bond coat for a thermal barrier coating. The coating comprises a chromium-containing nickel aluminide intermetallic overlay coating of predominantly the gamma prime phase, in which aluminum is present in the coating in an amount approximately equal to the aluminum content of the superalloy substrate so as to inhibit diffusion of aluminum from the overlay coating into the superalloy substrate.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: October 30, 2007
    Assignee: General Electric Company
    Inventors: Ramgopal Darolia, William Scott Walston
  • Patent number: 7264888
    Abstract: An overlay coating for articles used in hostile thermal environments. The coating has a predominantly gamma prime-phase nickel aluminide (Ni3Al) composition suitable for use as an environmental coating and as a bond coat for a thermal barrier coating. The coating has a composition of, by weight, at least 6% to about 15% aluminum, about 2% to about 5% chromium, optionally one or more reactive elements in individual or combined amounts of up to 4%, optionally up to 2% silicon, optionally up to 60% of at least one platinum group metal, and the balance essentially nickel. A thermal-insulating ceramic layer may be deposited on the coating.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: September 4, 2007
    Assignee: General Electric Company
    Inventors: Ramgopal Darolia, Joseph David Rigney, William Scott Walston
  • Patent number: 7026011
    Abstract: A method for applying an aluminide coating on a gas turbine engine blade having an external surface and an internal cooling cavity having an internal surface that is connected to the external surface by cooling holes. The method is conducted in a vapor coating container having a hollow interior coating chamber, and includes the steps of loading the coating chamber with the blade to be coated; providing an aluminide coating gas in the loaded coating chamber; maintaining the loaded coating chamber comprising the aluminide coating gas at a specified temperature and time to deposit an aluminide coating on the external surface of the blade; and then flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified gas flow rate and time to move the aluminide coating gas through the cooling holes and internal cooling cavity and deposit an aluminide coating on the internal surface of the blade.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: April 11, 2006
    Assignee: General Electric Company
    Inventors: Roger Dale Wustman, William Scott Walston, Matthew David Saylor, Brian Harvey Pilsner, Jeffrey Allan Pfaendtner
  • Patent number: 6974637
    Abstract: An article and TBC coating system thereon that in combination exhibit significantly improved spallation resistance. The article comprises a substrate formed of a metal alloy containing ruthenium and one or more refractory elements (e.g., tantalum, tungsten, molybdenum, rhenium, hafnium, etc.). The substrate is protected by a coating system comprising an aluminum-containing bond coat on the surface of the substrate and a ceramic coating bonded to the substrate by the bond coat. The bond coat, preferably an aluminide, is deposited so as to be substantially free of ruthenium, though ruthenium is present in the bond coat as a result of diffusion from the substrate into the bond coat.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: December 13, 2005
    Assignee: General Electric Company
    Inventors: Jeffrey Allan Pfaendtner, Deborah A. Schorr, Ramgopal Darolia, Joseph David Rigney, Irene Spitsberg, William Scott Walston
  • Patent number: 6929825
    Abstract: A method for applying an aluminide coating on a gas turbine engine blade having an external surface and an internal cooling cavity having an internal surface that is connected to the external surface by cooling holes. The method is conducted in a vapor coating container having a hollow interior coating chamber, and includes the steps of loading the coating chamber with the blade to be coated; providing an aluminide coating gas in the loaded coating chamber; flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified gas flow rate and time to move the aluminide coating gas through the cooling holes and internal cooling cavity and deposit an aluminide coating on the internal surface of the blade; and then flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified higher temperature and time to deposit an aluminide coating on the external surface of the blade.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: August 16, 2005
    Assignee: General Electric Company
    Inventors: Roger Dale Wustman, William Scott Walston, Matthew David Saylor, Brian Harvey Pilsner, Jeffrey Allan Pfaendtner
  • Patent number: 6926928
    Abstract: A gas turbine component, such as a turbine disk or a turbine seal element, is protected by depositing an oxide coating on the gas turbine component. The deposition is performed by a vapor deposition process such as metal-organic chemical vapor deposition (MOCVD) to a coating thickness of from about 0.2 to about 50 micrometers, preferably from about 0.5 to about 3 micrometers. The deposited oxide may be an oxide of aluminum, silicon, tantalum, titanium, and chromium.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: August 9, 2005
    Assignee: General Electric Company
    Inventors: John Frederick Ackerman, Joseph Aloysius Heaney, Bangalore Aswatha Nagaraj, James Andrew Hahn, Michael James Weimer, Jon Conrad Schaeffer, William Scott Walston
  • Patent number: 6905730
    Abstract: A method for forming an aluminide coating on a turbine engine component having an external surface and an internal cavity defined by an internal surface that is connected to the external surface by at least one hole. The method is conducted in a vapor coating container having a hollow interior coating chamber, and includes the steps of loading the coating chamber with the component to be coated; flowing a tri-alkyl aluminum coating gas into the loaded coating chamber at a specified temperature, pressure, and time to deposit an aluminum coating on the external and internal surfaces of the component; and heating the component in a nonoxidizing atmosphere at a specified temperature and time to form an aluminide coating on the external and internal surfaces. The coated component is typically then maintained at an elevated temperature in the presence of oxygen to form an oxide coating on the external and internal surfaces of the component.
    Type: Grant
    Filed: July 8, 2003
    Date of Patent: June 14, 2005
    Assignee: General Electric Company
    Inventors: John Frederick Ackerman, Michael James Weimer, Joseph Aloysius Heaney, William Scott Walston, Bangalore Aswatha Nagaraj
  • Patent number: 6905559
    Abstract: A composition of matter is about 1 to about 3 percent rhenium, from about 6 to about 9 percent aluminum, from 0 to about 0.5 percent titanium, from about 4 to about 6 percent tantalum, from about 12.5 to about 15 percent chromium, from about 3 to about 10 percent cobalt, from about 2 to about 5 percent tungsten, from 0 to about 0.2 percent hafnium, from 0 to about 1 percent silicon, from 0 to about 0.25 percent molybdenum, from 0 to about 0.25 percent niobium, balance nickel and minor elements. The composition is preferably made into a substantially single crystal article, such as a component of a gas turbine engine.
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: June 14, 2005
    Assignee: General Electric Company
    Inventors: Kevin Swayne O'Hara, William Scott Walston, Charles Gitahi Mukira, Melvin Robert Jackson
  • Patent number: 6887589
    Abstract: A beta-phase NiAl overlay coating containing a dispersion of ceramic particles and a process for depositing the overlay coating. If the coating is used to adhere a thermal barrier coating (TBC), the TBC exhibits improved spallation resistance as a result of the dispersion of ceramic particles having a dispersion-strengthening effect on the overlay coating. The overlay coating contains at least one reactive element and is deposited so that the some of the reactive element deposits as the ceramic particles dispersed in the overlay coating.
    Type: Grant
    Filed: April 18, 2003
    Date of Patent: May 3, 2005
    Assignee: General Electric Company
    Inventors: Ramgopal Darolia, Joseph David Rigney, William Scott Walston, Jeffrey Allan Pfaendtner, Brett Allen Rohrer Boutwell, Irene Spitsberg, James Anthony Ruud
  • Patent number: 6843861
    Abstract: A coated nickel-base superalloy article, which is otherwise susceptible to the formation of a secondary reaction zone, is prepared by furnishing a nickel-base superalloy article substrate having thereon an initial aluminum-containing coating comprising an initial-coating additive zone and an initial-coating diffusion zone. The article is susceptible to the formation of the secondary reaction zone if heated to an elevated SRZ reaction temperature for an SRZ reaction period of time. The formation of the secondary reaction zone is avoided by first removing the initial-coating additive zone and the initial-coating diffusion zone, and thereafter depositing a subsequent aluminum-containing coating onto the article substrate. The subsequent aluminum-containing coating includes a subsequent-coating additive zone and a subsequent-coating diffusion zone.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: January 18, 2005
    Assignee: General Electric Company
    Inventors: Theodore Robert Grossman, Ronald Gustav Rajala, Dwayne Edward Burnett, William Scott Walston, Wendy Howard Murpjy
  • Patent number: 6844086
    Abstract: A coated superalloy article is prepared by furnishing a nickel-base superalloy article substrate having a rhenium content of not less than about 4.0 percent by weight, and thereafter depositing an aluminum-containing coating onto a surface of the article substrate. The aluminum-containing coating includes an additive zone having an average aluminum content of not greater than about 27 percent by weight, and a diffusion zone of interdiffusion with the article substrate. A ratio of a thickness of the additive zone to a thickness of the diffusion zone is not greater than about 3:1, and is preferably about 1:1.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: January 18, 2005
    Assignee: General Electric Company
    Inventors: Theodore Robert Grossman, Ronald Gustav Rajala, Dwayne Edward Burnett, William Scott Walston, Wendy Howard Murpjy
  • Publication number: 20040209110
    Abstract: A beta-phase NiAl overlay coating containing a dispersion of ceramic particles and a process for depositing the overlay coating. If the coating is used to adhere a thermal barrier coating (TBC), the TBC exhibits improved spallation resistance as a result of the dispersion of ceramic particles having a dispersion-strengthening effect on the overlay coating. The overlay coating contains at least one reactive element and is deposited so that the some of the reactive element deposits as the ceramic particles dispersed in the overlay coating.
    Type: Application
    Filed: April 18, 2003
    Publication date: October 21, 2004
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Jeffrey Allan Pfaendtner, Ramgopal Darolia, William Scott Walston, Brett Allen Rohrer Boutwell, Irene Spitsberg, James Anthony Ruud, Joseph David Rigney
  • Publication number: 20040151836
    Abstract: A method for applying an aluminide coating on a gas turbine engine blade having an external surface and an internal cooling cavity having an internal surface that is connected to the external surface by cooling holes. The method is conducted in a vapor coating container having a hollow interior coating chamber, and includes the steps of loading the coating chamber with the blade to be coated; providing an aluminide coating gas in the loaded coating chamber; flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified gas flow rate and time to move the aluminide coating gas through the cooling holes and internal cooling cavity and deposit an aluminide coating on the internal surface of the blade; and then flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified higher temperature and time to deposit an aluminide coating on the external surface of the blade.
    Type: Application
    Filed: February 4, 2003
    Publication date: August 5, 2004
    Inventors: Roger Dale Wustman, William Scott Walston, Matthew David Saylor, Brian Harvey Pilsner, Jeffrey Allan Pfaendtner
  • Publication number: 20040151834
    Abstract: A method for applying an aluminide coating on a gas turbine engine blade having an external surface and an internal cooling cavity having an internal surface that is connected to the external surface by cooling holes. The method is conducted in a vapor coating container having a hollow interior coating chamber, and includes the steps of loading the coating chamber with the blade to be coated; providing an aluminide coating gas in the loaded coating chamber; maintaining the loaded coating chamber comprising the aluminide coating gas at a specified temperature and time to deposit an aluminide coating on the external surface of the blade; and then flowing an inert carrier gas into the loaded coating chamber comprising the aluminide coating gas at a specified gas flow rate and time to move the aluminide coating gas through the cooling holes and internal cooling cavity and deposit an aluminide coating on the internal surface of the blade.
    Type: Application
    Filed: February 4, 2003
    Publication date: August 5, 2004
    Inventors: Roger Dale Wustman, William Scott Walston, Matthew David Saylor, Brian Harvey Pilsner, Jeffrey Allan Pfaendtner
  • Publication number: 20040109786
    Abstract: A composition of matter is about 1 to about 3 percent rhenium, from about 6 to about 9 percent aluminum, from 0 to about 0.5 percent titanium, from about 4 to about 6 percent tantalum, from about 12.5 to about 15 percent chromium, from about 3 to about 10 percent cobalt, from about 2 to about 5 percent tungsten, from 0 to about 0.2 percent hafnium, from 0 to about 1 percent silicon, from 0 to about 0.25 percent molybdenum, from 0 to about 0.25 percent niobium, balance nickel and minor elements. The composition is preferably made into a substantially single crystal article, such as a component of a gas turbine engine.
    Type: Application
    Filed: December 6, 2002
    Publication date: June 10, 2004
    Inventors: Kevin Swayne O'Hara, William Scott Walston, Charles Gitahi Mukira, Melvin Robert Jackson
  • Publication number: 20040042927
    Abstract: A superalloy article has a composition consisting essentially of, in weight percent, from about 4 to about 12 percent cobalt, from about 3.5 to about 7 percent tungsten, from about 2 to about 9 percent chromium, from about 0.5 to about 4.5 percent tantalum, from about 5.5 to about 7.5 percent aluminum, from 0 to about 5.5 percent rhenium, from about 0.1 to about 1.2 percent titanium, from 0 to about 3 percent molybdenum, from 0 to about 3 percent ruthenium, from about 0.5 to about 2 percent columbium, about 0.01 percent maximum boron, about 0.07 percent maximum carbon, from about 0.3 to about 1 percent hafnium, about 0.01 percent maximum zirconium, about 0.03 percent maximum yttrium, from 0 to about 0.5 percent vanadium, about 0.01 percent maximum cerium, and about 0.01 percent maximum lanthanum, balance nickel and impurity elements. The article is preferably substantially a single crystal or oriented polycrystal in a shape such as a gas turbine blade.
    Type: Application
    Filed: August 27, 2002
    Publication date: March 4, 2004
    Inventors: Kevin Swayne O'Hara, William Scott Walston, Earl Warren Ross