Patent ID: 7238390

Claim:
Method for coating a surface of a substrate with at least one refractory layer containing silicon, comprising the steps of: preparing a coating precursor comprising a silicone resin and a mineral filler capable of chemically reacting with the said resin so as to produce a cohesive refractory layer after a calcination operation, said coating precursor being prepared in the form of a powder containing about 10% to 20% by weight of said resin, said resin being selected from the group consisting of polymethylsiloxanes, polymethylsilsesquioxanes and mixtures thereof, comprising a proportion of OH groups substituted for methyl groups; coating the surface by electrostatic powder sprinkling with the coating precursor, so as to form a green layer; performing a calcination heat treatment to eliminate volatile materials from the coating precursor, calcine the green layer and form a cohesive refractory layer.