TEXTILE PREFORMS SHEATHED IN A BORON NITRIDE COATING, COMPOSITES INCORPORATING THEM AND THEIR PREPARATION

摘要

The invention concerns: textile preforms, sheathed in a boron nitride coatin g; said coating (which has been produced on said pre-constituted textile preforms) having an original structure: granular microporous; composite materials structured by thermolysis, the reinforcing texture of which is constituted by said textile preforms; the respective methods for preparing the textile preforms and said composite materials structured by thermolysis. The invention is characterise d in that their textile preforms, with fibre base (F), sheathed in the original interphase (I BN), embedded in the densifying matrix (M).