DenSys DS-200 coating is a proprietary HVOF Cr3C2-NiCr cermet coating used in elevated temperature service environments including fluidized bed boilers, coal-fired boilers and municipal waste incinerators. The elevated temperature erosion-corrosion (oxidation) behavior of this HVOF Cr3C2-NiCr coating was investigated using a range of test temperatures, impact angles, erodents, and particle velocities. The erosion-corrosion behavior of HVOF Cr3C2-NiCr coatings was compared with 1018 steel and other thermal-spray coatings including FeCrSiB (Armacor M), Ni-base, Cr2O3-6SiO2-4Al2O3 (Rokide C), Cr2O3-12SiO2-2Al2O3-4MgO (Rokide MBC), and WC-NiCrCo (SMI 712). It was found that the erosion-oxidation resistance of HVOF Cr3C2-NiCr coating was higher than 1018 steel and other coatings at both impact angles 30° and 90°. The erosion-oxidation behavior of coatings was well related to their morphology. The high erosion-oxidation resistance of the HVOF Cr3C2-NiCr coating was attributed to its low porosity, fine grain structure and homogeneous distribution of hard carbides/oxides which form a skeletal network within a ductile and corrosion-resistant metal binder.

Subject
Nickel coatings, Coatings, Materials, Metal wastage, High velocity oxy fuel spraying, Thickness loss, Impact velocity, Wastage, Erosion, Steel, Ash, Erosion corrosion, Thermal spray coatings
Keywords:
HVOF Cr3C2-NiCr cermet coating, erosion-oxidation, brittle material, morphology, bed ash, temperature, velocity, impact angle, erosivity, cracking
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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