Ta. Parthasarathy et al., COMBINED EFFECTS OF EXPOSURE TO SALT (NACL) WATER AND OXIDATION ON THE STRENGTH OF UNCOATED AND BN-COATED NICALON(TM) FIBERS, Journal of the American Ceramic Society, 81(7), 1998, pp. 1812-1818
The environmental stability of uncoated and boron nitride-coated (BN-c
oated) Nicalon(TM) fiber has been investigated by studying the effect
of annealing in air at 1000 degrees C (2 h) on the strength of the fib
ers. The results imply that uncoated and BN-coated fibers both degrade
in strength, with the BN-coated fiber suffering a higher strength los
s, The degradation is significantly enhanced if the fibers are exposed
to salt (NaCl) water prior to the air anneal, if the concentration of
salt is >0.5 wt%, The BN-coated Nicalon(TM) fibers also have been stu
died at 800 degrees and 900 degrees C; the degradation in strength due
to salt water exposure is greater at 800 degrees C than that at 900 d
egrees or 1000 degrees C.