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Optimising the HVOF Deposition Technology of Al2O3-40%TiO2 Coatings for Energy Industry Applications

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Abstract:

The paper presents a systematic approach to optimize the HVOF deposition technology of Al2O3 40 TiO2 coatings for the protection of components in the energy industry. Key performance factors evaluated include scratch resistance, surface roughness, and friction coefficient, given their importance for the intended applications. By means of a comprehensive experimental program using the Design of Experiment (DOE) method, the main HVOF process parameters were investigated, such as Fuel-to-Oxygen ratio (F/O), Stand-off Distance (SOD), and Powder Feed Rate (PFR), to identify optimal deposition conditions. Scratch resistance tests revealed that increasing the F/O and reducing the SOD significantly improved the tribological properties of the coatings. Surface morphology analysis through optical and electron microscopy confirmed that optimized HVOF parameters lead to dense coatings with low roughness and minimal defects, essential characteristics for components subjected to wear and severe friction. Additionally, tribological measurements demonstrated a significant reduction in the coefficient of friction for the optimized coatings. The obtained results demonstrate the HVOF technology’s capability to produce Al2O3 40 TiO2 coatings with superior properties for protecting energy industry components operating under severe conditions. The presented optimization approach can serve as a guide for best practices in developing new coating systems with enhanced performance.

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Periodical:

Solid State Phenomena (Volume 379)

Pages:

41-52

DOI:

https://doi.org/10.4028/p-y7wTcc

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Online since:

November 2025

Authors:

Alin Constantin Murariu*, Ion Aurel Perianu, Marius Cocard, Eneia Frici

Keywords:

Al2O3, HVOF, Optimised Coatings, TiO2 Powders

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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