Investigation of molten droplet impact phenomena at different scales by acoustic emission technique

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PhD student Loïse Cao, loise.cao@unilim.fr; CNRS research scientist Vincent Rat, vincent.rat@unilim.fr; CNRS engineer assistant Quentin Dubreuil, quentin.dubreuil@unilim.fr; Associate professor Simon Goutier, simon.goutier@unilim.fr; Associate professor Lucille Despres, lucille.despres@unilim.fr; 
Full professor Thierry Chotard, thierry.chotard@unilim.fr; 

https://doi.org/10.53192/ITSC2026523

Plasma spraying is a multi-parameter process with limited reproducibility [P. Fauchais, 2004]. To overcome this issue, in-situ diagnostics, including acoustic emission (AE), have been increasingly employed due to their capabilities to monitor the coating formation [V. Viswanathan, 2024] and to provide relevant data for training artificial intelligence algorithms. However, it is essential to first deconvolute the physical phenomena involved in the process. This study focuses on the understanding of the spreading and solidification mechanisms of a molten droplet impacting a substrate. These phenomena have been widely investigated in the literature, through both experimental approaches [S. Goutier, 2010] and numerical modeling [S. Oukach, 2012] and are still complex to fully describe. In this context, AE in-situ techniques offer valuable insights into these dynamic events. An experimental campaign was conducted using AE to monitor the impact of molten alumina droplets ranging from micrometer to millimeter size on different substrates materials. The recorded acoustic signals are analyzed to have distinct signatures, which are associated with variations in process conditions. These results help to understand the dynamics of droplet during impact and define AE as a suitable technique for real-time monitoring in plasma spraying process.

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Erscheinungsdatum

March 2026

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