Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Office National D'etudes Et De Recherches Aerospatiales

Association Pour La Recherche Et Le Developpement Des Methodes Et

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

Office National D'etudes Et De Recherche Aerospatiales (onera)

Tecphy

Andre M Walder

Michel Marty

Christophe Delaunay

Christian A Ducrocq

Tasadduq Khan

Brigitte Martin

James Henry Davidson

Andre R Hivert

Philippe M Galmiche

Shigehisa Naka

Gerard Lemaitre

Yves C Bienvenu

Didier P Lestrat

Catherine Duquenne

Bernard Paintendre

Henri Octor

Michel L Allouard

Pierre Thevenin

Michele Soucail

Didier Loco

Jean Charles Lautridou

A process for forming metal components of controlled porosity by welding, in which a predetermined amount of metal elements ( ) of oblong shape is introduced into a mold ( ) in which it is distributed isotropically. The metal elements are then subjected to increasing pressure (P) until the component has its final shape. The walls of the mold are then held in position and an electric current (I) flows through the metal elements and welds them together by local melting at the points of contact due to the Joule effect.

Method and device for forming porous metal parts by sintering

A nickel-based superalloy possessing good mechanical properties when hot regarding traction, creep and cracking resistance has a chemical composition which comprises, in percentages by weight: Co 14.5 to 15.5 ; Cr 12 to 15 ; Mo 2 to 4.5 : Al 2.5 to 4; Ti 4 to 6; Hf not more than 0.5 ; C 100 to 300 ppm; B 100 to 500 ppm; Zr 200 to 700 ppm; possibly W up to 4.5; and nickel as the remainder. Components made from these alloys have an excellent microstructural stability when operating at temperatures up to 800.degree. C.

Nickel-based superalloys with high temperature stability

Tantalum-based and niobium-based alloys made up entirely of a crystalline medium exhibiting a substantially continuous centered cubic structure, comprising an intermetallic compound of formula Ti.sub.2 AlMo, and having the following compositions on an atomic basis:

Niobium or tantalum based high specific strength inter metallic

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:

Niobium and titanium based alloys resistant to oxidation at high

An element is disclosed for filtering and/or purifying hot gases, comprising a fibrous structure with a predetermined degree of porosity and formed of metal alloy fibrils of the MCrAlX type, in which M is a matrix chosen from iron and/or nickel and/or cobalt, and X is an element reinforcing the adhesion of the oxide layer which is formed on the fibrils in contact with the hot gases, chosen from zirconium, yttrium, cerium, lanthanum and misch metal.

Element for filtering and/or purifying hot gases, and a process for

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.

Superalloy compositions with a nickel base

A process for forming a titanium base alloy comprises compacting a powder formed of particles of titanium or of a mother alloy thereof and of a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume which is less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder. Then the alloy is heat treated at a temperature higher than the point of transformation into phase .beta. and quenched. The product is typically selected among S, P, B, As, Se, Te, Y and the lanthanides.

Process for forming a titanium base alloy with small grain size by

A metal article having perforations therein whose transverse cross-sectional dimension is less than 0.4 mm has formed thereon a surface diffusion alloy by applying a refractory filter element to the workpiece surface prior to the diffusion treatment, the filter element being a refractory felt based on metal fibres including chromium in a proportion by weight of from 10 to 60%. The felt is oxidized to give a layer of chromium oxide. This is followed by conventional thermochemical powder diffusion treatment in the presence of at least one chromium oxide-reducing element selected from aluminium, yttrium, titanium and the lanthanides.

Process for forming surface diffusion alloy layers on refractory

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L'Hay-les-Roses, France

Andre M Walder