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Effect of Bn Interfacial Coating on the Strength of a Silicon Carbide/Silicon Nitride Composite

Published online by Cambridge University Press:  15 February 2011

Kirk P. Norton  and
Holger H. Streckert
Kirk P. Norton
Affiliation:
General Atomics, P.O. Box 85608, San Diego, CA 92186–9784
Holger H. Streckert
Affiliation:
General Atomics, P.O. Box 85608, San Diego, CA 92186–9784
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Abstract

Boron nitride has been identified as a good fiber/matrix interface coating for SiC fibers in a Si3N4 matrix. Boron nitride thin films prepared from BCl3 and NH3 at 1000°C and from B2 H6 and NH3 at 550°C were deposited on SiC (Nicalon®) cloth in a low pressure chemical vapor deposition reactor. The coating thickness was varied from 0.1 μm up to 4 μm. Six layers of cloth for each coating thickness were incorporated into a chemical vapor infiltrated matrix of amorphous Si3N4.

Flexural strength data and composite toughness were obtained from three-point bend tests. Scanning electron microscopy and metallographic analysis of fracture surface morphology were used to determine the failure mode.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 250: Symposium R – Chemical Vapor Deposition of Refractory Metals and Ceramics II , 1991 , 239
Copyright
Copyright © Materials Research Society 1992

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