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Strength and stability studies on mini-tow ceramic composites made with nitrided Nextel (TM) 312 fibers and silicon oxycarbide

Gonczy, S. T. and Oba, K. and Faber, K. T. (1998) Strength and stability studies on mini-tow ceramic composites made with nitrided Nextel (TM) 312 fibers and silicon oxycarbide. In: 22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A. Ceramic Engineering and Science Proceedings. Vol.19. No.19-3. American Ceramic Society , Westerville, OH, pp. 147-154. ISBN 9780470375587.

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Nitridation of Nextel(TM) 312 alumino-borosilicate fibers produces a boron-nitride-rich surface layer which acts as a debond layer in ceramic composites. This interface-fiber system offers a low cost alternative to CVD deposition of coatings on alumina and silicon carbide fibers. Ceramic fiber composites were made with 6 infiltration/pyrolysis cycles of a nitrided multifilament Nextel(TM) 312 mini-tow, using Blackglas(TM) resin to produce a silicon oxycarbide matrix. In the as-prepared condition the Nextel-Blackglas(TM) mini-tow composites had a mean tensile breaking load of 53 Newtons, a coefficient of variation of 26%, and limited fiber pull-out. The Nextel(TM) composites were then heat-treated in air at 600°, 800°, and 1000°C to determine oxidation stability. After 600°C oxidation for 200 hours, the Blackglas(TM) Nextel(TM) composites retained 75% of the as-prepared tensile break load with a fibrous fracture surface. Oxidation for 24 hours at 1000°C and for 100 hours at 800°C reduced the retained tensile breaking load by 47% and 66% respectively, showing reduced strain-to-failure and distinct embrittlement of the composite.

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Faber, K. T.0000-0001-6585-2536
Additional Information:Copyright © 1988 The American Ceramic Society. The authors would like to thank Dr. Jack Sikonia of AlliedSignal for the contribution of Nextel™ tow and Blackglas™ resin.
Series Name:Ceramic Engineering and Science Proceedings
Issue or Number:19-3
Record Number:CaltechAUTHORS:20140908-181325422
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49410
Deposited By: George Porter
Deposited On:12 Sep 2014 21:44
Last Modified:10 Nov 2021 18:43

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