Characterization of BN rich layer on ammonia treated Nextel{trademark}312 fibers

Book · Sun Oct 01 00:00:00 EDT 1995

OSTI ID:100580

Khasgiwale, N R; Butler, E P; Tsakalakos, L; Hensley, D A; Cannon, W R; Danforth, S C ^[1]; Gonczy, S T ^[2]

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1. Rutgers, The State Univ. of New Jersey, Piscataway, NJ (United States). Center for Ceramic Research
2. AlliedSignal, Des Plaines, IL (United States)

A BN rich layer grown on Nextel{trademark}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{trademark}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.

• OSTI ID: 100580
• Report Number(s): CONF-941144-; ISBN 1-55899-266-9; TRN: 95:019530
• Resource Relation: Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic matrix composites -- Advanced high-temperature structural materials; Lowden, R.A.; Ferber, M.K. [eds.] [Oak Ridge National Lab., Oak Ridge, TN (United States)]; Hellmann, J.R. [ed.] [Pennsylvania State Univ., University Park, PA (United States). Center for Advanced Materials]; Chawla, K.K. [ed.] [New Mexico Inst. of Mining and Technology, Socorro, NM (United States)]; DiPietro, S.G. [ed.] [Textron Specialty Materials, Lowell, MA (United States)]; PB: 493 p.; Materials Research Society symposium proceedings, Volume 365
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
FABRICATION
MICROSTRUCTURE
ALUMINIUM SILICATES
BORON SILICATES
BORON NITRIDES
TEXTILES
AMMONIA
HEAT TREATMENTS
X-RAY DIFFRACTION
PHOTOELECTRON SPECTROSCOPY
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY
CRYSTALLIZATION
AMORPHOUS STATE
MORPHOLOGY
OXIDATION
EXPERIMENTAL DATA