Tribological performance assessment of Al2O3-YSZ composite coatings deposited by hybrid powder-suspension plasma spraying
Journal article, 2021

The advent of high-throughput plasma spray systems that allow axial feeding encourages the study of using
liquid feedstock for various next-generation functional applications. The current study explores the benefit of
such a plasma spray system to deposit hybrid powder-suspension Al2O3-YSZ ceramic matrix composite (CMC)
coatings for tribological applications. The tribological performance of the hybrid processed CMC coatings was
assessed using scratch, ball-on-plate wear and erosion tests and compared with that of monolithic powderderived
Al2O3 coatings. As-deposited and tribo-tested coatings were characterized using Scanning Electron Microscopy,
X-ray Diffraction and Energy Dispersive Spectroscopy to analyse their microstructure and phase
constitution. The results showed that the tribological performance of the hybrid powder-suspension Al2O3-YSZ
CMC coating was significantly improved by enhancing the wear resistance under scratch, dry sliding ball-onplate
and erosion tests as compared to the conventional APS deposited monolithic Al2O3 coating. About 36%
decrease in the dry sliding ball-on-plate specific wear rate and up to 50% decrease in the erosion wear rate was
noted in the hybrid powder-suspension Al2O3-YSZ CMC coating as compared to the conventional APS deposited
monolithic Al2O3 coating. The study concludes that the hybrid powder-suspension route can create CMC coatings
with unique multi-length scale microstructures which can be attractive for combining different tribological attributes
in the same coating system.



Scratch & wear




Axial plasma Spray


Ashish Ganvir

University West

Sneha Goel

University West

Sivakumar Govindarajan

Adwait Rajeev Jahagirdar

University West

Stefan Bjorklund

University West

Uta Klement

Chalmers, Industrial and Materials Science, Materials and manufacture

Shrikant Joshi

University West

Surface and Coatings Technology

0257-8972 (ISSN)

Vol. 409 126907

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Metallurgy and Metallic Materials

Areas of Advance


Materials Science



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Latest update

2/5/2021 3