The unlubricated sliding wear behavior of several coating materials pairs that are candidates for the piston ring-cylinder wall application in adiabatic diesel engines was determined in air at 25°, 425° and 730°C. Plasma sprayed metal bonded carbide composites on a washer component were worn in a 90° reversing oscillatory mode against a slurry deposited and impregnated mixed oxide on a wider surface disc at contact pressures from 0.17 to l4MPa. It was determined that the morphology of the coatings was more important than the composition in establishing wear rates. The ductile binder metal of the carbides was the dominant constituent on the wear interface of both the washer and the disc. Wear rates generally increased with temperature. A pre-test wear-in at 25°C and a low contact pressure enhanced the wear resistance of the plasma sprayed carbide materials both at higher pressures and higher temperatures.

Subject
Wear, Test methods, Coatings, Materials, Carbides, Molybdenum, Composition, Metal surfaces, Tungsten carbide, Surface morphology, Surfaces, Oxide surfaces, Weight loss
© 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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