Characterization of BN-films deposited onto carbon fibres by a continuous CVD-process

Abstract

Pyrolytic BN-films have been prepared continuously on HT-carbon fibres by conventional CVD using the reaction of BCl₃ with NH₃ at temperatures between 700–1000° C and at ambient pressure. The film thickness varied with the N: B ratio, the dilution of the reactant gases, the flow conditions in the reactor tube and the velocity of roving. Good infiltration was obtained up to a thickness of about 50 nm at a speed of roving of 5 m/h. The coatings were characterized by XPS, TEM, REM, X-ray diffraction and thermogravimetric analysis.