Kl. Choy et al., EFFECT OF TIB2, TIC AND TIN PROTECTIVE COATINGS ON TENSILE-STRENGTH AND FRACTURE-BEHAVIOR OF SIC MONOFILAMENT FIBERS, Composites, 26(8), 1995, pp. 531-539
TiB2, TiC and TiN have been studied as potential protective coatings t
o prevent the deleterious interfacial reactions between SiC fibres and
Ti alloy matrices. These coatings have been deposited on to resistive
ly heated SiC monofilament fibres at reduced pressure in a cold wall r
eactor by a chemical vapour deposition technique. Microstructure, stre
ngth and fracture properties of SIC fibres coated with the different p
rotective coatings were evaluated and compared. The adhesion of the Ti
C coating on SiC fibre was comparatively weaker than that of the TiB2
coating. The strength of SiC monofilaments coated with TIC was lower t
han that of monofilaments coated with TiB2. The morphology of TiN coat
ings revealed severe cracking and spalling. Results of a thermoelastic
stress analysis were helpful in interpreting these experimental obser
vations.