Patents by Inventor Christian A. B. Ducrocq

Christian A. B. Ducrocq 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).

  • Niobium and titanium based alloys resistant to oxidation at high temperatures
    Patent number: 5284618
    Abstract: A niobium and titanium based alloy having a density less than 6.5 and possessing a high resistance to oxidation at high temperatures in the region of 900.degree. C. has a chemical composition comprising, in atomic percentages:more than 24% Nbfrom 30 to 48% Tifrom 21 to 38% Aland possibly up to 8% of at least one of Cr, Mo, V and Zr.
    Type: Grant
    Filed: March 20, 1992
    Date of Patent: February 8, 1994
    Assignees: Association pour la Recherche et le Developpement des Methodes et Processus Industriels "A.R.M.I.N.E.S.", Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
    Inventors: Michel L. Allouard, Yves C. Bienvenu, Christophe Delaunay, Christian A. B. Ducrocq, Gerard Lemaitre, Michel Marty, Andre Walder
  • Superalloy compositions with a nickel base
    Patent number: 5104614
    Abstract: Superalloy with a nickel base matrix having good mechanical properties when ot in respect of tensile strength, creep resistance, low cycle fatigue and resistance to crack-propagation of which the composition in percentages by weight is as follows: Cr 11 to 13; Co 8 to 17; Mo 6 to 8; Nb less than or equal to 1.5; Ti 4 to 5; Al 4 to 5; Hf less than or equal to 1; C, B, Zr each less than or equal to 500 ppm; Ni remainder to 100. The alloy can be manufactured advantageously by powder metallurgy techniques and used in the manufacture of turbo machine disks.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: April 14, 1992
    Assignees: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A.", Association pour la Recherche et le Developpement des Methodes et Processus Industriels - "A.R.M.I.N.E.S.", Tecphy, Office National d'Etudes et de Recherches Aerospatiales - "O.N.E.R.A."
    Inventors: Christian A. B. Ducrocq, Didier P. A. Lestrat, Bernard Paintendre, James H. Davidson, Michel Marty, Andre Walder
  • Inclusion decanting process for nickel-based superalloys and other metallic materials
    Patent number: 5102449
    Abstract: In a method of remelting metallic materials, particularly nickel-based superalloys, in which the melting operation is carried out in a cooled copper crucible under clean vacuum conditions by means of electromagnetic inductors, the magnetic field applied to the mass of molten metal has a frequency between 50 Hz and 5.times.10.sup.6 Hz, preferably between 5.times.10.sup.3 Hz and 5.times.10.sup.5 Hz, so as to effect simultaneously electromagnetic stirring of the liquid metal and a surface concentration at the cold walls of the mass to be recast of all the non-conductive particles, especially ceramic inclusions, thereby achieving an inclusion decanting.
    Type: Grant
    Filed: September 4, 1991
    Date of Patent: April 7, 1992
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
    Inventors: Christian A. B. Ducrocq, Marcel Garnier, Gerard Lemaitre, Pascal J. Rivat, Pierre M. Vernay
  • Electro-magnetic nozzle device for controlling a stream of liquid metal tapped from a crucible
    Patent number: 5074532
    Abstract: An electro-magnetic nozzle device for controlling the jet of liquid metal tapped at the outlet of a melting crucible comprises an electro-magnetic inductor and a magnetic field concentrator which surrounds the outlet of the crucible and is constituted by at least four three-dimensional sectors arranged evenly around the crucible outlet and separated from each other by radial slits, each sector having an internal water-cooled cavity, radially inner and outer walls of which the inner wall is of less height than the outer wall, and windings disposed in the inner and outer walls forming an electro-magnetic inductor.
    Type: Grant
    Filed: July 10, 1990
    Date of Patent: December 24, 1991
    Assignee: Societe Nationale d'Etude et de Construction de Moteurs d'Aviation "S.N.E.C.M.A."
    Inventors: Christian A. B. Ducrocq, Marcel Garnier, Pascal J. Rivat, Maurita Roscini