Protecting parts made of carbon-containing composite material from oxidation

Abstract

A method of protecting a part made of carbon-including composite material against oxidation, the method including a) applying a coating composition on at least a portion of the outside surface of the part, the coating composition being in the form of an aqueous suspension including: a metallic phosphate; a powder of a compound comprising titanium; and a B 4 C powder; and b) applying heat treatment to the coating composition applied during step a) with a treatment temperature lying in the range 330° C. to 730° being imposed during the heat treatment in order to obtain a coating on the outside surface of the part, the coating including a first phase in which the metallic phosphate is in crystalline form and a second phase in which the metallic phosphate is in amorphous form.

1 . A coating composition in the form of an aqueous suspension comprising:
 a metallic phosphate;   a powder of a compound comprising titanium; and   a B 4 C powder.   
     
     
         2 . A composition according to  claim 1 , further comprising:
 the metallic phosphate at a content by weight lying in the range 27% to 36%;   the B 4 C powder at a content by weight lying in the range 11.5% to 21%; and   the powder of the titanium-comprising compound at a content by weight lying in the range 8% to 18%.   
     
     
         3 . A composition according to  claim 2 , further comprising:
 aluminum phosphate at a content by weight lying in the range 27% to 36%;   the B 4 C powder at a content by weight lying in the range 11.5% to 21%;   the powder of the titanium-comprising compound at a content by weight lying in the range 8% to 18%;   an alkoxylated acetylenic polyol at a content by weight lying in the range 0.1% to 1.5%; and   water at a content by weight lying in the range 33% to 50%.