The development of structural carbon fiber reinforced carbon matrix (carbon-carbon) has been received lots of attention due to the potential application in the new generation of aircraft, missile systems, and hypersonic planes. These applications involve long exposure to highly oxidizing environments. Therefore, development of a reliable anti-oxidation system for C/C composites is required to maintain integrity of these materials at high temperature applications.

A ternary hafnium-silicon-carbon compound system is deposited on C/C composites using chemical vapor deposition. Extensive testing has proved that this coating can provide a very good oxidation resistance up to 1900°C under cyclic cooling/heating in air. Analytical techniques such as EDXA, AES, XRD, and XPS were used to characterize the deposited coating and to modify the parameters of deposition technique to reproduce this protective system for C/C composites.

Subject
Chemical compounds, Coatings, Materials, Substrates, Diffusion, Silicon carbide, Composites, Weight loss, Oxygen, Carbon, Deposit corrosion, Oxidation, High temperature
Keywords:
carbon/carbon, oxidation, coating, CVD, thermal cycling, protection
© 1993 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1993
Association for Materials Protection and Performance (AMPP)
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