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Journal of Thermal Spray Technology

, Volume 21, Issue 3–4, pp 651–658 | Cite as

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

  • Jiří NohavaEmail author
  • Petr Haušild
  • Šárka Houdková
  • Radek Enžl
Peer-Reviewed

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.

Keywords

Instrumented indentation HVOF Hardness Elastic modulus Gaussian distribution 

Notes

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.

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Copyright information

© ASM International 2012

Authors and Affiliations

  • Jiří Nohava
    • 1
    Email author
  • Petr Haušild
    • 2
  • Šárka Houdková
    • 3
  • Radek Enžl
    • 4
  1. 1.CSM InstrumentsPeseuxSwitzerland
  2. 2.Department of Materials, Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PraguePraha 1Czech Republic
  3. 3.Research and Testing Institute PlzeňPlzeňCzech Republic
  4. 4.Flame Spray TechnologiesDuivenThe Netherlands

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