Abradable coating made of a material having a low surface roughness
AssigneeSafran Aircraft Engines
InventorsMichael Podgorski, Philippe Charles Alain Le Biez, Ludovic Edmond Camille Molliex, Serge Selezneff
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Abstract
The present invention relates to an abradable coating for a turbine engine part, characterized by the fact that said coating includes a layer made of an abradable material, the surface asperities of which are filled with thermally bonded ceramic grains, forming a smooth, free surface having a low roughness.
Claims9
A method of manufacturing a stator part of a turbine engine, the stator part configured to be outside a rotor part or facing a rotor part, the stator part comprising an internal face that comprises a layer of a MCrAlY abradable coating wherein M is selected from the group consisting of Ni, Co, NiCo, and CoNi, the layer of the MCrAlY alloy being intended to form a seal between the stator part and the rotor part, the method comprising:
- filling surface irregularities of the layer of the abradable coating with ceramic grains, the ceramic grains being alumina, and
- heating the layer of the abradable coating to bind the ceramic grains by partial sintering, a free surface of the layer of the abradable coating comprising portions of the MCrAlY alloy and the alumina.
Dependencies are inferred from the claim text.