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 coating;said coating (which has been produced on saidpre-constituted textile preforms) having an original structure: granularmicroporous; composite materials structured by thermolysis, thereinforcing texture of which is constituted by said textile preforms; therespective methods for preparing the textile preforms and saidcomposite materials structured by thermolysis. The invention is characterisedin that their textile preforms, with fibre base (F), sheathed inthe original interphase (I BN), embedded in the densifying matrix (M).