Tribological performance of thermally sprayed NiWCrBSi alloy coating by two different oxyacetylene flame stoichiometries

In the present work, the effects of oxidising and standard flame spray techniques on microstructure and wear performance of Low Velocity Oxygen Fuel NiWCrBSi coatings produced onto mild steel substrate were studied. Results showed that coating microstructure was dependent on the stoichiometry of the...

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Bibliographic Details
Published in:Transactions of the Institute of Metal Finishing 2021-11, Vol.99 (6), p.313-323
Main Authors: Idir, Abdelhek, Delloro, Francesco, Younes, Rassim, Bradai, Mohand Amokrane, Sadeddine, Abdelhamid, Benabbas, Abderrahim
Format: Article
Language:English
Subjects:
Engineering Sciences
flame spray coatings
Materials
microstructure
NiWCrBSi
oxidising/standard flame
wear
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Summary:In the present work, the effects of oxidising and standard flame spray techniques on microstructure and wear performance of Low Velocity Oxygen Fuel NiWCrBSi coatings produced onto mild steel substrate were studied. Results showed that coating microstructure was dependent on the stoichiometry of the reacting gas mixture. Coatings produced in oxidising flame conditions showed higher amounts of semi-molten particles and high quantity of WC phases. Those coatings showed a good behaviour in dry sliding wear test, due to their higher hardness and the formation of compact and adherent oxide tribofilms. The wear behaviour of non-molten particles against friction forces is discussed, with the aim of establishing relationships between the tribological response of the material and its process-induced microstructure defects.
ISSN:0020-2967
1745-9192
DOI:10.1080/00202967.2021.1955525