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Structure-property relationships in suspension HVOF nano-TiO2 coatings

Structure-property relationships in suspension HVOF nano-TiO2 coatings
Structure-property relationships in suspension HVOF nano-TiO2 coatings
Hardness and tribological properties of microstructured coatings developed by conventional thermal spraying are significantly affected by the feedstock melting condition, however, their effect on the performance of nanostructured coatings by suspension high velocity oxy-fuel (HVOF) are inconclusive. In this work, nano-TiO2 coatings with different degrees of melting (12%, 51%, 81%) of nanosized feedstock were deposited via suspension HVOF spraying, using suspensions with a solid content of 5 wt.%. All the coatings produced had dense structures without visible pores and cracks. Two TiO2 crystal structures were identified in which the rutile content of the coatings increased with increased feedstock melting. Their mechanical, friction and wear behaviours largely relied on the extent of melting of the feedstock. The coating composed of mostly agglomerate particles (12% melted particles) had the lowest coefficient of friction and wear rate due to the formation of a smooth tribo-film on the wearing surface, while the coating composed of mostly fully melted splats (81% melted particles) presented the highest coefficient of friction and low wear rate, whose wear mechanism was dominated by abrasive wear and accompanied by the formation of cracks
HVOF, Suspension, TiO2, Friction and wear behaviour
2079-6412
1-16
Zhang, Feifei
c8490b23-a791-4f9f-9ab0-96520a288764
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Robinson, Ben W.
76b9ab79-e83b-4810-96a1-e300b06cb6ed
de Villiers-Loverlock, Heidi L.
a705563f-e329-43ef-9093-83919eb62d38
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Zhang, Feifei
c8490b23-a791-4f9f-9ab0-96520a288764
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Robinson, Ben W.
76b9ab79-e83b-4810-96a1-e300b06cb6ed
de Villiers-Loverlock, Heidi L.
a705563f-e329-43ef-9093-83919eb62d38
Wood, Robert J.K.
d9523d31-41a8-459a-8831-70e29ffe8a73

Zhang, Feifei, Wang, Shuncai, Robinson, Ben W., de Villiers-Loverlock, Heidi L. and Wood, Robert J.K. (2019) Structure-property relationships in suspension HVOF nano-TiO2 coatings. Coatings, 9 (8), 1-16, [504]. (doi:10.3390/coatings9080504).

Record type: Article

Abstract

Hardness and tribological properties of microstructured coatings developed by conventional thermal spraying are significantly affected by the feedstock melting condition, however, their effect on the performance of nanostructured coatings by suspension high velocity oxy-fuel (HVOF) are inconclusive. In this work, nano-TiO2 coatings with different degrees of melting (12%, 51%, 81%) of nanosized feedstock were deposited via suspension HVOF spraying, using suspensions with a solid content of 5 wt.%. All the coatings produced had dense structures without visible pores and cracks. Two TiO2 crystal structures were identified in which the rutile content of the coatings increased with increased feedstock melting. Their mechanical, friction and wear behaviours largely relied on the extent of melting of the feedstock. The coating composed of mostly agglomerate particles (12% melted particles) had the lowest coefficient of friction and wear rate due to the formation of a smooth tribo-film on the wearing surface, while the coating composed of mostly fully melted splats (81% melted particles) presented the highest coefficient of friction and low wear rate, whose wear mechanism was dominated by abrasive wear and accompanied by the formation of cracks

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More information

Accepted/In Press date: 7 August 2019
e-pub ahead of print date: 9 August 2019
Published date: August 2019
Keywords: HVOF, Suspension, TiO2, Friction and wear behaviour

Identifiers

Local EPrints ID: 433325
URI: http://eprints.soton.ac.uk/id/eprint/433325
ISSN: 2079-6412
PURE UUID: 9fc6c137-8d7f-4b19-9f3e-f14df41881fa
ORCID for Robert J.K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 14 Aug 2019 16:30
Last modified: 18 Feb 2021 16:43

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