The pre-synthesized Ni-20Cr nano-crystalline powder was deposited on K21590 boiler steel by cold-spray process. Nano-crystalline Ni-20Cr powder was synthesized by the investigators using ball milling. The nano-structured coating was developed using cold-spray process with an average coating thickness of 200 µm and microhardness of 600 HV having porosity < 1.5%. The high-temperature oxidation behavior of bare and coated samples was studied under cyclic conditions at 900°C for 50 cycles. The kinetics of oxidation was established using weight change measurements for the bare and the coated boiler steel. Various characterization techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy Energy Dispersive Spectroscopy (SEM/EDS) were used to analyze the oxidation products. The coating was found to offer excellent oxidation resistance and successful in reducing the weight gain of the steel by 71 %.

Subject
X-ray diffraction, Nickel coatings, Coatings, Materials, Composition, Substrates, Microhardness, Oxide scales, Powders, Steel, Boilers, Thermal spray coatings, Oxidation
Keywords:
Cold-spray, ball mill, high-temperature oxidation, oxide scale, boiler steels
© 2014 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).
2014
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.