Patents by Inventor Mohan G. Hebsur

Mohan G. Hebsur 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).

  • Oxidation resistant and low coefficient of thermal expansion Nia1-CoCrAly alloy
    Patent number: 6805725
    Abstract: A bond coat composition for use in thermal barrier coatings comprises a NiAl—CoCrAlY matrix containing particles of AlN dispersed therein. The bond coat composition is prepared by croymilling NiAl and CoCrAlY in liquid nitrogen.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: October 19, 2004
    Assignee: Ohio Aerospace Institute
    Inventor: Mohan G. Hebsur
  • Oxidation resistant and low coefficient of thermal expansion NiAl-CoCrAlY alloy
    Patent number: 6793706
    Abstract: A bond coat composition for use in thermal barrier coatings comprises a NiAl—CoCrAlY matrix containing particles of AlN dispersed therein. The bond coat composition is prepared by croymilling NiAl and CoCrAlY in liquid nitrogen.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: September 21, 2004
    Assignee: Ohio Aerospace Institute
    Inventor: Mohan G. Hebsur
  • Oxidation resistant and low coefficient of thermal expansion NiA1-CoCrAly alloy
    Patent number: 6454992
    Abstract: A bond coat composition for use in thermal barrier coatings comprises a NiAl—CoCrAlY matrix containing particles of AlN dispersed therein. The bond coat composition is prepared by croymilling NiAl and CoCrAlY in liquid nitrogen.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: September 24, 2002
    Assignee: Ohio Aerospace Institute
    Inventor: Mohan G. Hebsur
  • Pest resistant MoSi2-based materials containing in-situ grown &bgr;-Si3N4 whiskers
    Patent number: 6391811
    Abstract: A MoSi2 pest resistant material includes in-situ grown &bgr;-Si3N4 whiskers. In addition to excellent pest resistance, the material provides a lower coefficient of thermal expansion for better match with continuous reinforcing fibers such as SiC fibers. A two stage heating and pressing production technique enables lower temperature processing with substantially full densification.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: May 21, 2002
    Assignee: Ohio Aerospace Institute
    Inventor: Mohan G. Hebsur
  • Pest resistant MoSi2-based materials containing in-situ grown &bgr;-Si3N4whiskers
    Patent number: 6288000
    Abstract: A MoSi2 pest resistant material includes in-situ grown &bgr;-Si3N4 whiskers. In addition to excellent pest resistance, the material provides a lower coefficient of thermal expansion for better match with continuous reinforcing fibers such as SiC fibers. A two stage heating and pressing production technique enables lower temperature processing with substantially full densification.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: September 11, 2001
    Assignee: Ohio Aerospace Institute
    Inventor: Mohan G. Hebsur
  • Nial-base composite containing high volume fraction of AlN for advanced engines
    Patent number: 5635654
    Abstract: A particulate reinforced NiAl-AlN composite alloy has a NiAl matrix and greater than about 13 volume percent fine particles of AlN within the matrix. The particles preferably have a diameter from about 15 nanometers to about 50 nanometers. The particulate reinforced NiAl-AlN composite alloy may be prepared by cryomilling prealloyed NiAl in liquid nitrogen using grinding media having a diameter of from about 2 mm to about 6 mm at an impeller speed of from about 450 RPM to about 800 RPM. The cryomilling may be done for a duration of from about 4 hours to about 20 hours to obtain a cryomilled powder. The cryomilled powder may be consolidated to form the particulate reinforced NiAl-AlN composite alloy. The particulate reinforced alloy can further include a toughening alloy. The toughening alloy may include NiCrAlY, FeCrAY and FeAl.
    Type: Grant
    Filed: May 5, 1994
    Date of Patent: June 3, 1997
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Mohan G. Hebsur, John D. Whittenberger, Carl E. Lowell
  • Pest resistant MoSi.sub.2 materials and method of making
    Patent number: 5429997
    Abstract: A pest resistant molybdenum disilicide composition is provided for use in high temperature structural applications. The composition includes molybdenum disilicide and silicon nitride and can be used to prepare improved reinforced composites.
    Type: Grant
    Filed: April 7, 1993
    Date of Patent: July 4, 1995
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Mohan G. Hebsur
  • Niobium-aluminum base alloys having improved, high temperature oxidation resistance
    Patent number: 4983358
    Abstract: A niobium-aluminum base alloy having improved oxidation resistance at high temperatures and consisting essentially of 48%-52% niobium, 36%-42% aluminum, 4%-10% chromium, 0%-2%, more preferably 1%-2%, silicon and/or tungsten with tungsten being preferred, and 0.1%-2.0% of a rare earth selected from the group consisting of yttrium, ytterbium and erbium. Parabolic oxidation rates, k.sub.p, at 1200.degree. C. range from about 0.006 to 0.032 (mg/cm.sup.2).sup.2 /hr. The new alloys also exhibit excellent cyclic oxidation resistance.
    Type: Grant
    Filed: September 13, 1989
    Date of Patent: January 8, 1991
    Assignee: Sverdrup Technology, Inc.
    Inventors: Mohan G. Hebsur, Joseph R. Stephens