Coating precursor and method for coating a substrate with a...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 24/08 (2006.01) C04B 35/622 (2006.01) C04B 35/634 (2006.01) C04B 41/46 (2006.01) C04B 41/49 (2006.01) C04B 41/50 (2006.01) C04B 41/86 (2006.01) C04B 41/87 (2006.01) C08G 77/14 (2006.01) C09D 183/04 (2006.01) C22B 21/00 (2006.01) C22B 21/06 (2006.01) C23C 18/12 (2006.01) C23C 26/00 (2006.01) C23F 11/18 (2006.01) C08K 3/00 (2006.01)

Patent

CA 2464340

The invention concerns coating precursor comprising a silicone resin, a mineral filler and an organic solvent capable of dissolving said resin and suspending the mineral filler, said silicone resin and said mineral filler being capable of chemically reacting so as to produce a solid layer on a substrate after the organic solvent has evaporated and a cohesive refractory layer after a calcination process. The invention also concerns a method for coating a specific surface of a substrate with at least a cohesive refractory silicone-containing layer which consists in coating the substrate with a coating precursor of the invention, so as to form a raw layer and in carrying out a heat treatment so as to calcine said raw layer and form a cohesive refractory layer. The invention enables to obtain a protective coating resistant to oxidizing surroundings, liquid metal or a solid or molten salt.

L'invention a pour objet un précurseur de revêtement comprenant une résine silicone, une charge minérale et un solvant organique apte à dissoudre ladite résine et à mettre en suspension la charge minérale, ladite résine silicone et ladite charge minérale étant aptes à réagir chimiquement de manière à produire une couche solide sur un substrat après évaporation du solvant organique et en couche réfractaire cohésive après une opération de calcination. L'invention a également pour objet un procédé pour revêtir une surface déterminée d'un substrat d'au moins une couche réfractaire contenant du silicium dans lequel on enduit le substrat d'un précurseur de revêtement selon l'invention, de façon à former une couche crue et on effectue un traitement thermique apte à entrainer la calcination de ladite couche crue et la formation d'une couche réfractaire cohésive. L'invention permet d'obtenir un revêtement protecteur apte à resister à des environnements oxydants, à du métal liquide ou à un sel solide ou en fusion.

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