Snecma

Office National D'etudes Et De Recherches Aerospatiales (Onera)

Onera (Office National D'etudes Et De Recherches Aerospatiales)

Armines

Jean-Pierre Trottier

Tasadduq Khan

Maurice Rabinovitch

Herve Bibring

Jean-Francois Stohr

Michel Jeandin

A method of manufacturing metal pieces by casting and sintering of a metal alloy powder of the type that includes two phases, a conforming phase during which a load of powder is heated inside a formal casting to execute a rigid preform which is porous and a compacting and sintering phase during which the preform is heated under isostatic pressure. The method and resulting metal piece is characterized in that the conforming phase is conducted so that the preform has open pores and the isostatic pressure is applied by way of an envelope that distorts and is airtight. The method is applied advantageously in the execution of complex formal pieces made of superalloys or made of a titanium alloy.

Method of manufacturing metal pieces by casting and sintering of a metal

A refractory composite material usable in making gas-turbine blades for aviation applications. The composite material comprises a nickel-based superalloy matrix containing cobalt, aluminum in the form of a Ni.sub.3 Al precipitate, and tungsten, and a reinforcing phase of oriented monocrystalline niobium carbide fibers formed in situ during production, by unidirectional solidification. The composition of the composite material by weight expressed in percent is:

Metal-refractory composite material

Composite materials which comprise a matrix of a complex refractory superoy and embedded in said matrix filiform particles of carbide and, in the matrix, a fine precipitation of carbide of the same nature as the one of the filiform particles.

Process for the improvement of refractory composite materials comprising

Growing community of inventors

Bagneux, France

Jean-Pierre Trottier