METHOD FOR PRODUCING AN ABRADABLE COATING, ABRADABLE COATING AND COATED PART

• Main Authors: HERISSON DE BEAUVOIR, Thomas, ESTOURNES, Claude, ANSART, Florence, ROUSSELLE, Mélanie, FRADET, Guillaume
• Format: Patent
• Language: English; French
• Published: 21.03.2024
• Subjects: ARTIFICIAL STONE; BLASTING; CEMENTS; CERAMICS; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINE PLANTS IN GENERAL; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; LIME, MAGNESIA; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PERFORMING OPERATIONS; REFRACTORIES; SLAG; STEAM ENGINES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING; TREATMENT OF NATURAL STONE; WEAPONS

The invention relates to a method for producing an abradable ceramic composite coating on a substrate, the method comprising: obtaining (E1) a composition (30) in powder form comprising a matrix powder and a ceramic filler hydrated precursor powder having a lamellar crystallographic structure, wherein the ceramic filler powder represents from 5 to 40% of the combined volume of the matrix powder and the ceramic filler powder; compressing the prepared powder composition at a pressure greater than 150 MPa; and a step of reactive sintering (E2) the obtained powder composition, during which the pressure is maintained at a temperature of less than 550°C, and the particles of the matrix powder in the sintered powder composition have an aspect ratio of 2 or greater. The invention also relates to an abradable ceramic coating obtained according to the method. The invention also relates to a superalloy part for a turbomachine, for example a turbine part, comprising such a coating. Procédé de fabrication d'un revêtement composite céramique abradable sur un substrat, comprenant : l'obtention (E1) d'une composition pulvérulente (30) comprenant une poudre de matrice et une poudre de précurseur hydraté de charge céramique possédant une structure cristallographique lamellaire, la poudre de charge céramique représentant 5 à 40 % du volume combiné de la poudre de matrice et de la poudre de charge céramique, la compression de la composition pulvérulente préparée à une pression supérieure à 150 MPa, et une étape de frittage réactif (E2) de la composition pulvérulente obtenue, pendant laquelle la compression est maintenue, à une température inférieure à 550°C et les particules de la poudre de matrice dans la composition pulvérulente frittée présentent un facteur de forme supérieur ou égal à 2. Revêtement céramique abradable obtenu selon le procédé. Pièce en superalliage pour turbomachine, par exemple de turbine, comprenant un tel revêtement.