Loading patent…
AssigneeSociete Europeenne de Propulsion
InventorsHenri Tawil, Xavier Bernard, jean-Claude Cavalier
Estimating the term…
The method comprises forming at least one external coating on the surface of the product to be protected, the coating being constituted by a composition mainly containing a mixture of phosphates, of silica, and of alumina belonging to a P.sub.2 O.sub.5 --SiO.sub.2 --Al.sub.2 O.sub.3 system, and, after drying, implementing heat treatment at a temperature that is sufficient at least to transform the external coating into an insoluble cement capable of forming a self-sealing glass. The external coating is formed of a liquid suspension that is applied by spray-painting or by means of a brush, the suspension containing said mixture of phosphates, of silica, and of alumina. Prior to forming the external coating, the product may be impregnated to the core within the residual open pores of the composite material, using a liquid solution of phosphates, of sodium, and of potassium.
A method of providing protection against oxidation for a product made of a composite material containing carbon and a ceramic surface, protection being provided by at least one liquid composition capable of leaving a refractory residue that is non-oxidizing and self-sealing, the method being characterized in that it comprises at least the steps consisting of:
A product made of a composite material containing carbon and protected against oxidation by an external coating that is refractory and non-oxidizing, the product being characterized in that the coating is constituted by a cement that is insoluble in water and that is formed of a composition consisting essentially of a mixture of phosphates, of silica, and of alumina.
A product made of a composite material containing carbon and protected against oxidation by a vitreous external coating that is self-sealing, the product being characterized in that the coating is constituted by a silica glass that is formed of a composition consisting essentially of a mixture of phosphates, of silica, and of alumina.
A method of providing protection against oxidation for a product made of a composite material containing carbon and having an external layer with a ceramic surface, protection being provided by at least one liquid composition capable of leaving a refractory residue that is non-oxidizing and self-sealing, the method being characterized in that it comprises at least the steps consisting of:
Dependencies are inferred from the claim text.