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The Effect of Heat Treatment on the Oxidation Mechanism of Blended Powder Cr3C2-NiCr Coatings

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Abstract

The advantageous oxidation and wear properties of Cr3C2-NiCr thermal spray coatings have resulted in them being extensively applied to combat erosion at high temperatures. Under these conditions, oxide layers take on an ever more significant role in determining the composite response. The response of blended powder-based carbide coatings for erosion applications has formed the basis for application of cermet-based coatings at elevated temperature. In this study, the oxidation mechanisms of as-sprayed and heat-treated Cr3C2-NiCr blended powder-based coatings are characterized. Interdiffusion between the coating phases with long-term exposure increased the Cr content of the matrix phase. This had a significant effect on the oxidation mechanism. The implications of the change in oxidation mechanism and oxide morphology on the coating response to high-temperature erosion are discussed.

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Acknowledgments

The authors gratefully acknowledge the assistance of WOKA GmbH, Metal Spray Suppliers (NZ) Ltd, and Holster Engineering (NZ) Ltd for supplying the powder and coatings for this work. The financial assistance provided by Material Performance Technologies (NZ) and The University of Auckland is greatly appreciated.

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Authors and Affiliations

  1. School of Engineering and Advanced Technology, Massey University, Auckland, New Zealand

    S. Matthews

  2. Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand

    B. James & M. Hyland

Authors
  1. S. Matthews
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  2. B. James
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  3. M. Hyland
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Corresponding author

Correspondence to S. Matthews.

Additional information

This article is an invited paper selected from presentations at the 2009 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Expanding Thermal Spray Performance to New Markets and Applications: Proceedings of the 2009 International Thermal Spray Conference, Las Vegas, Nevada, USA, May 4-7, 2009, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2009.

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Matthews, S., James, B. & Hyland, M. The Effect of Heat Treatment on the Oxidation Mechanism of Blended Powder Cr3C2-NiCr Coatings. J Therm Spray Tech 19, 119–127 (2010). https://doi.org/10.1007/s11666-009-9381-7

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  • DOI: https://doi.org/10.1007/s11666-009-9381-7

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