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Role of micro- and nano-CeO 2 reinforcements on characteristics and tribological performance of HVOF sprayed Cr3C2-NiCr coatings
Sardar Vallabhbhai Patel Institute of Technology (SVIT), Vasad, Gujarat (IND).
Sardar Vallabhbhai Patel Institute of Technology (SVIT), Vasad, Gujarat (IND).
Sardar Vallabhbhai Patel Institute of Technology (SVIT), Vasad, Gujarat (IND).
ardar Vallabhbhai Patel Institute of Technology (SVIT), Vasad, Gujarat (IND).
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2023 (English)In: Surface and Coatings Technology, ISSN 0257-8972, Vol. 467, article id 129684Article in journal (Refereed) Published
Abstract [en]

The present study investigates the role of micro- and nano-CeO2 reinforcements on microstructural, mechanical and tribological properties of Cr3C2-NiCr coatings deposited using high-velocity-oxy-fuel (HVOF) spray process. A novel blending method involving ultrasonication, magnetic stirring and 3D-tumbler mixing was used to prepare the micro- and nano-CeO2 reinforced Cr3C2-NiCr feedstock powders. Unreinforced Cr3C2-NiCr coatings were also prepared for comparison purposes. X-ray diffraction, FE-SEM, EDS mapping, optical microscopy and optical profilometry were used to characterize the coatings. Tribological studies were performed on the coatings using modular ball-on-disc tribometer. The results showed that nano-CeO2 reinforced coatings yielded considerable reduction in porosity, surface roughness and CoF values while significantly enhancing the hardness and fracture toughness in comparison to the micro-CeO2 reinforced and unreinforced Cr3C2-NiCr coatings. The addition of nanoCeO2 to the coatings contributed to the microstructure refinement and to the formation of stable tribo-oxide layer, resulting in a lower specific wear rate under identical test conditions. Performance of micro-CeO2 reinforced coatings was intermediate to that of nano-CeO2 reinforced and unreinforced Cr3C2-NiCr coatings.

Place, publisher, year, edition, pages
2023. Vol. 467, article id 129684
Keywords [en]
Microstructure refinement, Cr3C2-NiCr, HVOF, Ultrasonication, Wear
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-20291DOI: 10.1016/j.surfcoat.2023.129684ISI: 001025755500001Scopus ID: 2-s2.0-85162121861OAI: oai:DiVA.org:hv-20291DiVA, id: diva2:1780529
Note

The authors would like to thank Gujarat Council on Science and Technology (GUJCOST) for providing financial assistance through STI policy (GUJCOST/Research Grant/STI/2020-21/2258).

Available from: 2023-07-06 Created: 2023-07-06 Last updated: 2024-05-29Bibliographically approved

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Joshi, Shrikant V.

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