Patents Assigned to Groupement pour les Activites Atomiques et Avancees
  • Refractory insulating products having controlled porosity and the preparing thereof by the wet method
    Patent number: 4142908
    Abstract: Refractory insulating products having controlled porosity, a high resistance to thermal shock, erosion and corrosion by liquid metals such as aluminium, obtained by the wet method, containing (a) an aluminous cement (b) a refractory aggregate, and (c) more than 10% by weight, in relation to the refractory aggregate, of polycrystalline ceramic fibers with at least 70% alumina and at most 30% silica.
    Type: Grant
    Filed: February 27, 1978
    Date of Patent: March 6, 1979
    Assignee: Groupement pour les Activites Atomiques et Avancees
    Inventors: Jean Daviot, Michel Marchais
  • Insulating ceramic substances having controlled porosity and the method for preparing them by sintering
    Patent number: 4119469
    Abstract: The present invention concerns insulating ceramic substances, passive with respect to corrosive molten metals such as aluminium or steel, having a controlled porosity, withstanding without cracking repeated thermal shocks. Such ceramics are obtained by sintering without charge at a low temperature after addition of a fluoride.
    Type: Grant
    Filed: May 3, 1977
    Date of Patent: October 10, 1978
    Assignee: Groupement pour les Activites Atomiques et Avancees
    Inventors: Henri Carbonnel, Francois Chaminade
  • Method of preparing insulating refractory products and the product thereof
    Patent number: 4086097
    Abstract: Refractory products having remarkable resistance to thermal shocks, comprising 60% of the total weight of ceramic fibres, dispersed in 40% of the total weight of cement, obtained by slow heating up to 800.degree. C after the setting and the stripping. A chemical bond is set up in those conditions between the fibre and the calcium aluminate of the cement. Application to the manufacturing of parts remaining in contact with reactive molten metals.
    Type: Grant
    Filed: December 24, 1975
    Date of Patent: April 25, 1978
    Assignee: Groupement pour les Activites Atomiques et Avancees "GAAA" S.A.
    Inventor: Henri Carbonnel
  • Fluid-tight cold-chamber pressure casting apparatus
    Patent number: 4061176
    Abstract: Apparatus comprising a crucible, a level-determining tank, a vacuum pump, an injection cylinder, a mould and appropriate interconnecting pipes. Molten metal is kept under vacuum throughout except that in a modification a gas may be deliberately introduced into the mould to provide a surface treatment of the casting.
    Type: Grant
    Filed: July 26, 1976
    Date of Patent: December 6, 1977
    Assignee: Groupement pour les Activites Atomiques et Avancees "GAAA" S.A.
    Inventor: Henri Carbonnel
  • Installation for the treating of a molten metal
    Patent number: 3961778
    Abstract: Industrial treating of corrosive molten metals by a gas within molten liquid duct of a treating electromagnetic pump comprising an installation in which the input of said treating pump is connected to an ascending pump immersed in said molten metal and the output of said treating pump is connected to a degassing tank provided with a spout pouring out the treated molten metal.
    Type: Grant
    Filed: May 28, 1974
    Date of Patent: June 8, 1976
    Assignee: Groupement pour les Activites Atomiques et Avancees
    Inventors: Henri Carbonnel, Pierre Vaury
  • Partly melting rotating helical ring assembly
    Patent number: 3940150
    Abstract: Partly melting rotating seal assembly surrounding a rotating shaft crossing through a wall limiting a volume of fluid kept under pressure, constituted by a solidified sleeve of the fluid to be sealed or of an intermediate fluid, contained in an external metallic sleeve fast with the wall, provided with cooling means. A very thin thread, fast with the shaft, maintains during the rotation of the shaft, a thin liquid film between the shaft and the solidified sleeve, ensuring sealing along said shaft.
    Type: Grant
    Filed: September 26, 1974
    Date of Patent: February 24, 1976
    Assignee: Groupement pour les Activites Atomiques et Avancees "GAAA"
    Inventors: Jean Martin, Jean-Louis Ollier, Paul Petit