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Characterization of Hard Coatings Using Acoustic Emission.

Ivana Sára Škrobáková1, Peter Gogola1, Marián Palcut1

  • 1Institute of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Ulica Jána Bottu 25, 917 24 Trnava, Slovakia.

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Summary

Acoustic emission (AE) testing objectively quantifies physical vapor deposited (PVD) coating damage during indentation. Increased delamination exponentially boosts AE signal energy, reducing reliance on scanning electron microscopy (SEM).

Keywords:
CrNPVD coatingSEMacoustic emissionadhesionindentation testing

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Area of Science:

  • Materials Science
  • Non-Destructive Testing

Background:

  • Acoustic emission (AE) is a non-destructive testing method with broad applications.
  • Physical vapor deposited (PVD) coatings require robust evaluation of their functional properties and damage.

Purpose of the Study:

  • To demonstrate the capability of AE testing in studying PVD coating functional properties.
  • To objectively classify coating damage during indentation testing by quantifying imprint features.

Main Methods:

  • Systematic recording of AE response across nine sample conditions and 27 imprints.
  • Correlation analysis between numerical values from Scanning Electron Microscopy (SEM) observations and AE signal characteristics.

Main Results:

  • An exponential increase in AE signal energy was observed with an increasing delaminated coating area.
  • Identified correlations between SEM-derived values and AE signal characteristics.

Conclusions:

  • AE analysis offers a more objective and potentially faster alternative to SEM-based evaluation for PVD coatings.
  • AE testing can accelerate systematic research and provides practical application insights for PVD coatings.