Snecma Moteurs

Philippe Le Biez

Claude Marcel Mons

Christian Coddet

Philippe Perruchaut

Yann Lebret

Pierre Bertrand

Karim Larabi

Jo&euml;l Vigneau

A powder material for forming an abradable coating, the material comprising a metal powder based for the most part on aluminum and containing manganese or calcium. The material is applicable to seals of a turbomachine.

Powder material for an abradable seal

The casing of the invention is of the type supporting series of stationary blades having disposed between them series of blades that are movable in rotation about a longitudinal axis. In characteristic manner, said casing comprises a main element and, at least facing one of the series of moving blades, an assembly comprising a plate made of a honeycomb material and a covering disposed on the face of the plate facing away from the blades so that said cells are open towards the blades, said covering being provided with holes that open out into cells of the plate, thereby forming open cells, said covering closing other cells of the plate, thereby forming closed cells, a cavity being formed between said plate and the inside face of said main element. Preferably, the casing forms the casing of an axial compressor operating at low pressure in a turbojet engine.

Casing, a compressor, a turbine, and a combustion turbine engine including such a casing

The coating of abradable material presents cavities opening out into the surface of the coating, the cavities extending over a fraction of the thickness of the coating and being defined by walls which form a plurality of continuous paths at the inside surface of the annular portion between the axial end faces thereof, and which form an angle of not less than 5&deg; relative to the general direction of end portions of blades that might come into contact with the abradable material.

Abradable coating for gas turbine walls

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Draveil, France

Philippe Le Biez