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WC-Co/Al Multilayer Coatings by Warm Spray Deposition

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Abstract

WC-Co/aluminum multilayer coatings have been developed by using warm spray deposition to improve fracture toughness and damage tolerance of conventional WC-Co coatings and to investigate the effects of ductile layer addition on their fracture properties. Prior to depositing the multilayer coatings, the mechanical properties of three metal coatings of aluminum, copper, and titanium, which were deposited by warm spraying, were evaluated. The aluminum coating showed excellent ductility among them and was selected for use as ductile layers for the multilayer coatings. The fracture behavior of WC-Co/Al coatings was examined by the four-point bending test. The multilayer coatings did not break in a brittle manner after reaching maximum load, but exhibited a plateau as a result of the ductility of the aluminum layers. The fracture behavior was compared with the finite element analysis results, and they showed good agreement in a general trend. It has been concluded that ductile metal reinforcements, by advanced thermal spray techniques such as warm spray deposition, are very effective to enhance the toughness and damage tolerance of sprayed cermet coatings.

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Acknowledgments

Authors greatly acknowledge Fujimi Incorporated (Japan) for providing WC-Co feedstock powder. This work was supported as a part of Fail-Safe Hybrid Materials project (2006-2010) in National Institute for Materials Science Japan.

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Authors and Affiliations

  1. High Temperature Materials Unit, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan

    Makoto Watanabe, Masayuki Komatsu & Seiji Kuroda

Authors
  1. Makoto Watanabe
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  2. Masayuki Komatsu
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  3. Seiji Kuroda
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Corresponding author

Correspondence to Makoto Watanabe.

Additional information

This article is an invited paper selected from presentations at the 2011 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray 2011: Proceedings of the International Thermal Spray Conference , Hamburg, Germany, September 27-29, 2011, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and André McDonald, Ed., ASM International, Materials Park, OH, 2011.

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Watanabe, M., Komatsu, M. & Kuroda, S. WC-Co/Al Multilayer Coatings by Warm Spray Deposition. J Therm Spray Tech 21, 597–608 (2012). https://doi.org/10.1007/s11666-012-9773-y

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  • DOI: https://doi.org/10.1007/s11666-012-9773-y

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