Part made of a carbon-carbon composite with an SIC surface- treated matrix resistant to oxidation and a process for producing it

摘要

A structural part made of carbon-carbon composite with a matrix surface-treated with SiC, resistant to oxidation and a process for manufacturing it.PPAccording to the invention, the structural part has a fibrous preform (2) composed solely of carbon fibers (4) immersed in a matrix (6) of carbon whose porosities (7, 8) contains ultrafine crystalline SiC powder (10) that serves as a gaseous diffusion barrier. The quantity of crystalline SiC powder is 5% to 30% by weight of the preform-matrix-powder unit. This part can resist up to 1700. degree. C. without external protection against oxidation.