J. Phys. III France
Volume 2, Numéro 8, August 1992
Page(s) 1413 - 1420
DOI: 10.1051/jp3:1992185
J. Phys. III France 2 (1992) 1413-1420

Chemical vapour deposition of very thin coatings on carbon fibre bundles

T. Stumm1, E. Fitzer1 and G. Wahl2

1  Institut für Chemische Technik, Universität Karlsruhe, 7500 Karlsruhe, Germany
2  Institut für Oberflächentechnik, Universität Braunschweig, 5300 Braunschweig, Germany

(Received 1st February, accepted 4 April 1992)

The continuous deposition of thin coatings of refractory materials on carbon fibre rovings is considered as the impregnation of a endless cylinder with slit-like pores in the direction parallel with the cylinder axis. From such a model, the limits of process parameters for the simultaneous coating of all individual monofilaments are derived. In detail a correlation between the deposition parameters and the resulting layer thickness is discussed for a deposition with high and low conversion respectively.

The deposition of thin (0.02 to 0.5  $\mu$m) SiC and TiN layers on carbon monofilaments is described in systematic experiments using a steady state laboratory equipment. The effect on the mechanical properties of the reinforcement fibers is shown.

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