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US 12,110,799 B2Granted
Abradable coating
AssigneeSafran Aircraft Engines
InventorsGuillaume Fradet, Laurent Paul Dudon, Serge Georges Vladimir Selezneff
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Abstract
The invention relates to an abradable coating for a turbomachine, comprising a mineral compound having a Mohs hardness of 6 or less and a melting temperature of more than 450° C. or even 800° C., and a polymeric compound with a content of between 40% and 70% by volume.
Claims24
An abradable coating for a turbomachine, comprising:
- a mineral compound, the Mohs hardness of which is less than or equal to 6 and the melting temperature of which is greater than 450° C., and
- a polymeric compound, with a content of between 40% and 70% by volume of the abradable coating,
- wherein the mineral compound is selected from:
- calcium fluoride, hydroxyapatite, lanthanum phosphate, diatomite, muscovite or barium sulfate, and
- wherein the porosity is less than 5%.
2 more elements
An abradable coating for a turbomachine, comprising:
- a mineral compound, the Mohs hardness of which is less than or equal to 6 and the melting temperature of which is greater than 450° C., and
- a polymeric compound, with a content of between 40% and 70% by volume of the abradable coating,
- wherein the mineral compound is selected from:
- calcium fluoride, hydroxyapatite, lanthanum phosphate, diatomite, muscovite or barium sulfate,
- wherein the mineral compound is hydroxyapatite and the polymeric compound is polyester.
2 more elements
An abradable coating for a turbomachine, comprising:
- a mineral compound, the Mohs hardness of which is less than or equal to 6 and the melting temperature of which is greater than 450° C., and
- a polymeric compound, with a content of between 40% and 70% by volume of the abradable coating,
- wherein the mineral compound is selected from:
- calcium fluoride, hydroxyapatite, lanthanum phosphate, diatomite, muscovite or barium sulfate,
- wherein the coating is insoluble in water and acetone.
2 more elements
A turbomachine module, comprising:
- a rotor provided with a plurality of moving vanes,
- a stator, and
- at least one abradable coating provided at the interface between a portion of the rotor and a portion of the stator,
- said at least one abradable coating comprising:
- a mineral compound, the Mohs hardness of which is less than or equal to 6 and the melting temperature of which is greater than 450° C., and
- a polymeric compound, with a content of between 40% and 70% by volume of the abradable coating,
- wherein the mineral compound is selected from:
- calcium fluoride, hydroxyapatite, lanthanum phosphate, diatomite, muscovite or barium sulfate,
- wherein the turbomachine module comprising at least one underlayer with a roughness Ra between 9 μm and 40 μm on the portion of the rotor and on the portion of the stator, under the abradable coating.
6 more elements
Dependencies are inferred from the claim text.