Patents Examined by M. Phipps
  • Method of ion nitriding steel workpieces
    Patent number: 5240514
    Abstract: In subjecting a steel workpiece to nitriding by glow discharge, formation of brittle nitrogen compound is restrained and the surface hardened layer with a nitrogen diffusion layer of high toughness is obtained by making the gas atmospheric condition the gas mixing ratio of N.sub.2 :H.sub.2 =1:2-40. By mixing Ar gas in the above gas atmospheric condition additionally, glow width is adjusted and glow discharge is allowed to enter into narrow concaves at the surface of a workpiece.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: August 31, 1993
    Assignee: NDK, Incorporated
    Inventors: Kiyomi Yasuura, Katunori Hanakawa, Yoshihisa Miwa
  • Nickel aluminide base single crystal alloys
    Patent number: 5167732
    Abstract: Nickel aluminide single crystal alloys having improved strength and ductility at elevated temperatures, produced by major elemental additions to strengthen the Ni.sub.3 Al phase by solid solutioning and/or secondary phase formation. The major elemental additions comprise (by weight) 7-20% Al, 0.5-9% molybedenum, 0.5-10% tungsten and 2-15% titanium. Optional minor elemental additions of boron, manganese, silcon and/or hafnium are preferred.
    Type: Grant
    Filed: October 3, 1991
    Date of Patent: December 1, 1992
    Assignee: Textron, Inc.
    Inventor: Subhash K. Naik