Method for smoothing the surface of a part made from a CMC material
AssigneesHerakles, Snecma
InventorsEric Bouillon, Nicolas Eberling-Fux, Serge Chateigner
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Abstract
A method of smoothing the surface of a ceramic matrix composite part presenting a surface that is undulating and rough. The method includes forming a ceramic coating on the surface of the part, the coating being made by applying a liquid composition on the surface of the part, the composition containing a ceramic-precursor polymer and a factory solid filler, curing the polymer, and transforming the cured polymer into ceramic by heat treatment. The method further includes impregnating the ceramic coating with a liquid metallic composition.
Claims11
A part made of thermostructural composite material comprising refractory fiber reinforcement densified by a ceramic matrix, the part also being provided with a ceramic coating comprising a ceramic phase and grains of a solid filler in powder form, the part further comprising a layer of metallic composition formed on an accessible surface of said ceramic coating, the metallic composition binding together the grains of the solid filler and/or particles of the ceramic coating and the layer of metallic composition forming on the accessible surface of the ceramic coating a layer that presents a smooth surface state, the metallic composition being retained in the ceramic coating and the metallic composition being made of a material that is different from that of the rains of the solid filler.
A part comprising:
- a densified component made of a thermostructural composite material consisting of a refractory fiber reinforcement densified by a ceramic matrix, and
- a ceramic coating arranged on an external surface of the densified component, the ceramic coating comprising a ceramic phase and grains of a solid filler in powder form, wherein a layer of metallic composition is formed on an accessible surface of said ceramic coating, the metallic composition binding together the grains of the solid filler and/or particles of the ceramic coating and the layer of metallic composition forming on the accessible surface of the ceramic coating a layer that presents a smooth surface state, the metallic composition being made of a material that is different from that of the grains of the solid filler.
A part made of thermostructural composite material comprising refractory fiber reinforcement densified by a ceramic matrix, the part also being provided with a ceramic coating comprising a ceramic phase and grains of a solid filler, the part further comprising a layer of metallic composition formed on an accessible surface of said ceramic coating, the metallic composition binding together the grains of the solid filler and/or particles of the ceramic coating and the layer of metallic composition forming on the accessible surface of the ceramic coating a layer that presents a smooth surface state, the metallic composition being retained in the ceramic coating, wherein the metallic composition is based on silicon-germanium alloy or on silicon-nickel alloy.
Dependencies are inferred from the claim text.