METHOD FOR FORMING A SMOOTH GLAZE-LIKE COATING ON A SUBSTRATE MADE OF A CERAMIC MATRIX COMPOSITE MATERIAL CONTAINING SIC, AND PART MADE OF A CERAMIC MATRIX COMPOSITE MATERIAL PROVIDED WITH SUCH A COATING

摘要

The invention relates to a method, including: depositing, onto the entire surface of a substrate, a refractory-cement paste mainly consisting of silica and alumina and mixed with a liquid, the cement paste filling in the hollow portions of the raised pattern of the surface; performing a heat treatment in order to harden the cement after the latter has set and obtain a first layer (22) of refractory-cement coating; depositing, onto the first layer, a slurry consisting of a glass frit suspended in a liquid and mainly consisting of a powder consisting of silica, boron oxide, alumina and at least one alkaline metal oxide; and performing a heat treatment for coating by softening and spreading the glass in order to obtain a second coating layer (24) forming a glaze covering the first layer, the composition of the glass frit being selected so as to form glass having a coating temperature of less than 1100°C and a glass-transition temperature of less than 750°C.