METHOD FOR COATING A SURFACE OF A SOLID SUBSTRATE WITH A LAYER COMPRISING A CERAMIC COMPOUND, AND COATED SUBSTRATE THUS OBTAINED

• Main Authors: JOULIA, AURELIEN, BIANCHI, LUC, MALIE, ANDRE, QUET, AURELIE, HERVE, EMMANUEL, BERNARD, BENJAMIN
• Format: Patent
• Language: English; French
• Published: 26.04.2018
• Subjects: BLASTING; 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; DIFFUSION TREATMENT OF METALLIC MATERIAL; ENGINE PLANTS IN GENERAL; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; STEAM ENGINES; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; WEAPONS

The invention relates to a method for coating at least one surface of a solid substrate with at least one layer comprising at least one ceramic compound by a suspension plasma spraying (SPS) technique, in which at least one suspension of solid particles of at least one ceramic compound is injected into a plasma jet, and then the thermal jet that contains the solid particle suspension is sprayed onto the surface of the substrate, by means of which the layer comprising at least one ceramic compound is formed on the surface of the substrate; method characterised in that, in the suspension, at least 90 vol% of the solid particles have a larger dimension (referred to as d90), such as a diameter, smaller than 15 µm, preferably smaller than 10 µm, and at least 50 vol% of the solid particles have a larger dimension, such as a diameter (referred to as d50), no smaller than 1 µm. The invention also relates to a substrate coated with at least one layer that can be obtained by said method. The invention also relates to a part comprising said coated substrate. The invention further relates to the use of said layer in order to protect a solid substrate against degradations caused by contaminants such as CMAS. Procédé de revêtement d'au moins une surface d'un substrat solide par au moins une couche comprenant au moins un composé céramique par une technique de projection plasma de suspensions «SPS», dans lequel on injecte moins une suspension de particules solides d'au moins un composé céramique dans un jet de plasma puis on projette le jet thermique qui contient la suspension de particules solides sur la surface du substrat, moyennant quoi on forme la couche comprenant au moins un composé céramique sur la surface du substrat; procédé caractérisé en ce que dans la suspension, au moins 90% en volume des particules solides présentent une plus grande dimension (appelée d90), telle qu'un diamètre, inférieure à 15 µm, de préférence inférieure à 10 µm, et au moins 50% en volume des particules solides présentent une plus grande dimension telle qu'un diamètre (appelée d50), supérieure ou égale à 1 µm. Substrat revêtu d'au moins une couche susceptible d'être obtenue par ledit procédé. Pièce comprenant ledit substrat revêtu. Utilisation de ladite couche pour protéger un substrat solide contre les dégradations causées par des contaminants tels que les CMAS.