Partially stabilized zirconia ceramic thermal barrier coatings were plasma sprayed on the valve faces and tulips and the piston crowns and cylinder heads of a locomotove size diesel engine at a designated thickness of 375μm (0.015″). They were tested in the engine on a test stand over a range of throttle settings for 500 hours using No. 2 diesel oil fuel. Properly applied coatings performed with essentially no change in composition, morphology or thickness. Improperly applied coatings underwent mild to severe spalling for reasons that could be readily identified. The durability of the coatings in the diesel engine combustion zone operating environment was dependent upon the quality control of the plasma spray process.

Subject
Coating performance, Coating application, Coatings, Materials, Cylinders, Substrates, Valves, Micrography, Substrate surfaces, Engines, Ceramics, Deposit corrosion, Barrier coatings
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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