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Comparison of Isolated Indentation and Grid Indentation Methods for HVOF Sprayed Cermets

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Abstract

This paper compares the results of two approaches of instrumented indentation for characterization of mechanical properties of HVOF coatings. Three types of HVOF sprayed coatings (Cr3C2-NiCr, WC-Co, (Ti, Mo)(C,N)-NiCo) were investigated by the means of isolated nanoindentation and grid indentation methods. The results of the isolated indentation revealed hardness and elastic modulus of the individual phases in very good agreement with the corresponding bulk material. The grid indentation method, based on statistical evaluation of a large number of indentations, was influenced by the carbide-matrix interface, which gave rise to a third peak apart from the two peaks corresponding to the carbides and metallic matrix. As a consequence, the bimodal Gaussian fit was insufficient and a trimodal fit had to be used. The results extracted from low load grid nanoindentations were quite close to the results of isolated indentations whereas higher load grid nanoindentation revealed overall properties of the coating.

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Acknowledgment

This research was carried out in the frame of the GACR P108/12/1872 and Czech Ministry of Education No. MSM 4771868401 research projects.

Author information

Authors and Affiliations

  1. CSM Instruments, Rue de la Gare 4, 2034, Peseux, Switzerland

    Jiří Nohava

  2. Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 00, Praha 1, Czech Republic

    Petr Haušild

  3. Research and Testing Institute Plzeň, Tylova 46, 301 00, Plzeň, Czech Republic

    Šárka Houdková

  4. Flame Spray Technologies, Dijkgraaf 40, 6921 RL, Duiven, The Netherlands

    Radek Enžl

Authors
  1. Jiří Nohava
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  2. Petr Haušild
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  3. Šárka Houdková
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  4. Radek Enžl
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Corresponding author

Correspondence to Jiří Nohava.

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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Nohava, J., Haušild, P., Houdková, Š. et al. Comparison of Isolated Indentation and Grid Indentation Methods for HVOF Sprayed Cermets. J Therm Spray Tech 21, 651–658 (2012). https://doi.org/10.1007/s11666-012-9733-6

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  • DOI: https://doi.org/10.1007/s11666-012-9733-6

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