Elevated Temperature Solid Particle Erosion Performance of Plasma-Sprayed Co-based Composite Coatings with Additions of Al{sub 2}O{sub 3} and CeO{sub 2}

Journal Article · Wed Nov 15 04:00:00 EST 2017 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-017-2973-3· OSTI ID:22860798

Desai, Vijay; Ramesh, M. R. ^[1]

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1. National Institute of Technology Karnataka, Department of Mechanical Engineering (India)

In this paper, investigation into solid particle erosion behavior of atmospheric plasma-sprayed composite coating of CoCrAlY reinforced with Al{sub 2}O{sub 3} and CeO{sub 2} oxides on Superni 76 at elevated temperature of 600 °C is presented. Alumina particles are used as erodent at two impact angles of 30° and 90°. The microstructure, porosity, hardness, toughness and adhesion properties of the as-sprayed coatings are studied. The effects of temperature and phase transformation in the coatings during erosion process are analyzed using XRD and EDS techniques. Optical profilometer is used for accurate elucidation of erosion volume loss. CoCrAlY/CeO{sub 2} coating showed better erosion resistance with a volume loss of about 50% of what was observed in case of CoCrAlY/Al{sub 2}O{sub 3}/YSZ coating. Lower erosion loss is observed at 90° as compared to 30° impact angle. The erosion mechanism evaluated using SEM micrograph revealed that the coatings experienced ductile fracture exhibiting severe deformation with unusual oxide cracks. Reinforced metal oxides provide shielding effect for erodent impact, enabling better erosion resistance. The oxidation of the coating due to high-temperature exposure reforms erosion process into oxidation-modified erosion process.

• OSTI ID: 22860798
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 11 Vol. 26; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERIUM OXIDES
CHROMIUM COMPOUNDS
COBALT COMPOUNDS
COMPOSITE MATERIALS
CRACKS
DEFORMATION
MICROSTRUCTURE
PHASE TRANSFORMATIONS
POROSITY
QUATERNARY ALLOY SYSTEMS
SCANNING ELECTRON MICROSCOPY
SPRAY COATING
SPRAYED COATINGS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM OXIDES