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Characterization of Dip‐Coated Boron Nitride on Silicon Carbide Fibers
Author(s) -
Shen Lu,
Tan Beng Jit,
Willis William S.,
Galasso Francis S.,
Suib Steven L.
Publication year - 1994
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.1151-2916.1994.tb07260.x
Subject(s) - materials science , auger electron spectroscopy , boron nitride , x ray photoelectron spectroscopy , boron , coating , composite material , ultimate tensile strength , boron carbide , boric acid , nitride , carbon fibers , chemical engineering , metallurgy , layer (electronics) , composite number , chemistry , physics , organic chemistry , nuclear physics , engineering
Amorphous boron nitride thin coatings (∼0.2 μm) have been formed on Nicalon and C‐Nicaion (pre‐carbon‐coated Nicalon) yarns via dip coating in boric acid solution followed by heating and nitriding in NH 3 gas at 1000°C. X‐ray photoelectron spectroscopy (XPS) and Auger electron spec‐troscopy (AES) studies have shown the formation of boron nitride. The coating was boron rich and contains oxygen. The N/B and O/B ratios range from 0.6 to 0.8 and from 0.1 to 0.25, respectively. Tensile strength measurements revealed that the BN‐coated C‐Nicalon yarn maintained ∼85% of its original strength while BN‐coated Nicalon lost ∼85% of its original strength. Auger depth profiles showed that there was a consumption of carbon during the heating and nitridation process for both BN‐coated Nicalon and C‐Nicalon fibers. However, the depletion of carbon in BN‐coated Nicalon fibers was much more severe than that in BN‐coated C‐Nicalon fibers.