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Combined Effects of Exposure to Salt (NaCl) Water and Oxidation on the Strength of Uncoated and BN‐Coated Nicalon™ Fibers
Author(s) -
Parthasarathy Triplicane A.,
Folsom Craig A.,
Zawada Larry P.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02551.x
Subject(s) - materials science , annealing (glass) , composite material , mechanical strength , boron nitride , fiber , degradation (telecommunications) , salt (chemistry) , boron , chemistry , telecommunications , organic chemistry , computer science
The environmental stability of uncoated and boron nitride‐coated (BN‐coated) Nicalon fiber has been investigated by studying the effect of annealing in air at 1000°C (2 h) on the strength of the fibers. The results imply that uncoated and BN‐coated fibers both degrade in strength, with the BN‐coated fiber suffering a higher strength loss. 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 fibers also have been studied at 800° and 900°C; the degradation in strength due to salt water exposure is greater at 800°C than that at 900° or 1000°C.