Three examples are presented of the utilization of aluminide diffusion coatings to improve the performance of components/materials used at high temperatures. First, the application of a pack aluminide coating to the radial cooling hole surfaces of a hot section industrial gas turbine blade, to address the problem of internal surface base material degradation during engine running, is described. Relevant characteristics of the aluminide coating and its effectiveness in preventing such degradation are reported. Next, a feasibility study of the use of the vapor aluminizing process to produce controlled increases in the through-thickness aluminium content of 50 μm thick foils of two commercial FeCrAl alloys is presented. It embraces a preliminary assessment of the effect of these increases on the oxidation behaviour of the foils at 1200°C. Finally, a pack aluminide coating has been formed on alloy 800 to assess its effect on carburization resistance. A partial characterization of the aluminized material is detailed. Pack carburization of uncoated and aluminized alloy 800 samples at 900°C in air revealed a distinct increase in carburization resistance due to the aluminide coating.

Subject
Carburization, Foil, Coatings, Materials, Composition, Metal surfaces, Diffusion, Aluminum, Commercial alloys, Internal surfaces, Aluminides, Aluminum alloys, Alloys
Keywords:
aluminide diffusion coatings, high temperature performance, industrial gas turbine blades, FeCrAl alloy foils, alloy 800 tube material
© 2005 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).
2005
Association for Materials Protection and Performance (AMPP)
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