Office National D'etudes Et De Recherches Aerospatiales

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

Association Pour La Recherche Et Le Developpement Des Methodes Et

Christophe Delaunay

Andre M Walder

Michel Marty

Tasadduq Khan

Christian A Ducrocq

Shigehisa Naka

Gerard Lemaitre

Yves C Bienvenu

Michel L Allouard

Pierre Thevenin

Didier Loco

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

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Paris, France

Christophe Delaunay