PRODUCTION AND CHARACTERIZATION OF C AND SIC LAYERS ON C FIBERS

The construction, testing and operation of a semi-technical system for the multi-stage coating of endless fibres by means of thermally-activ ated CVD is described. One objective of this is to apply layer systems under conditions similar to those used in production with long-term r eproducibility. Rovings coated in this way, for example, are made of h igh-tensile carbon fibres, and used as reinforcing components in the m anufacture of modem composite materials. Research programs and laborat ory test batches are characterized extensively by methods of surface a nd solid state analysis such as SEM, TEM, AES, XPS and RAMAN. Analytic al investigations are supplemented by strength measurements made at se veral sites on the fibre coating and on the later application.