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Characterization of BN Rich Layer on Ammonia Treated Nextel™312 Fibers

Published online by Cambridge University Press:  15 February 2011

N.R. Khasgiwale ,
E.P. Butler ,
L. Tsakalakos ,
D.A. Hensley ,
W.R. Cannon ,
S.C. Danforth  and
S.T. Gonczy
N.R. Khasgiwale
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
E.P. Butler
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
L. Tsakalakos
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
D.A. Hensley
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
W.R. Cannon
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
S.C. Danforth
Affiliation:
Center for Ceramic Research, Rutgers University, Piscataway, NJ 08855
S.T. Gonczy
Affiliation:
Alliedsignal, Des Plaines, IL 60017
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Abstract

A BN rich layer grown on Nextel™312 fibers by appropriate ammonia treatments was evaluated using various complimentary techniques including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM)/ Parallel Electron Energy Loss Spectroscopy (PEELS in TEM). Three different ammonia treatments were studied. Ammonia treatment resulted in crystallization of the Nextel™312 fiber. The BN rich surface layer formed due to ammonia treatment was clearly detected in XPS and PEELS both before and after oxidation. The layer thickness was estimated to be between 5–10 nm. The layer was stable after oxidation treatment at 600°C for 100 hours. High resolution TEM observations of the fiber surface revealed a variable BN rich layer thickness. Patches of turbostratic BN were observed under certain conditions, however mostly the layer appeared to be amorphous.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 365: Symposium M – Ceramic Matrix Composites–Advanced High-Temperature Structural Materials , 1994 , 389
Copyright
Copyright © Materials Research Society 1995

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