INCONEL* alloy MA 6000 is a precipitation hardenable, oxide dispersion strengthened nickel base superalloy produced by mechanical alloying. The alloy was developed as an airfoil section material for advanced gas turbines. The desire for maximum service life prompted a study to evaluate the coatability of alloy MA 6000 and its performance in the coated condition. A commercial NiCoCrAlY (Ta) alloy deposited by low pressure plasma spraying (LPPS) was chosen for this study. In addition, some specimens were coated with an interlayer of the type NiCrAl (Ta) between the alloy MA 6000 substrate and the LPPS coating of NiCoCrAlY(Ta). Specimens of alloy MA 6000 in the coated and uncoated conditions were exposed to oxidation in air plus 5% water vapor and to a combustion atmosphere of JP 5 fuel in a burner rig. The performance of the coatings was evaluated by detailed optical and scanning electron microscopy examination. This paper presents preliminary results of this study and compares the oxidation and burner-rig test results of coated alloy MA 6000, with and without the interlayer, with the performance of uncoated alloy MA 6000.

Subject
Nickel coatings, Coatings, Substrates, Nickel based alloys, Aluminum, Molybdenum alloys, Micrography, Superalloys, Aluminum alloys, Titanium alloys, Alloys, Oxidation, Samples
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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