Process Parameter Impact on Suspension-HVOF-Sprayed Cr2O3 Coatings

Jarkko Kiilakoski; Richard Trache; Stefan Björklund; Shrikant Joshi; Petri Vuoristo

doi:10.1007/s11666-019-00940-7

Process Parameter Impact on Suspension-HVOF-Sprayed Cr₂O₃ Coatings

Jarkko Kiilakoski, Richard Trache, Stefan Björklund, Shrikant Joshi, Petri Vuoristo

Materials Science and Environmental Engineering

Research output: Contribution to journal › Article › Scientific › peer-review

17 Citations (Scopus)

17 Downloads (Pure)

Abstract

Chromium oxide (Cr₂O₃) is commonly used as an atmospheric plasma-sprayed (APS) coating from powder feedstock in applications requiring resistance to sliding wear and corrosion, as well as amenability to texturing, e.g., in anilox rolls. Recently, high-velocity oxy-fuel spray methods involving suspension feedstock have been considered an extremely promising alternative to produce denser and more homogeneous chromium oxide coatings with lower as-sprayed surface roughness, higher hardness and potentially superior wear performance compared to conventional APS-sprayed coatings. In this study, the impact of process parameters namely auxiliary air cleaning nozzles and a transverse air curtain on suspension high-velocity oxy-fuel-sprayed Cr₂O₃ suspensions is presented. The produced coatings are characterized for their microstructure, mechanical properties and wear resistance by cavitation erosion. The results reveal the importance of optimized air nozzles and air curtain to achieve a vastly improved coating structure and performance.

Original language	English
Pages (from-to)	1933–1944
Number of pages	12
Journal	Journal of Thermal Spray Technology
Volume	28
Issue number	8
DOIs	https://doi.org/10.1007/s11666-019-00940-7
Publication status	Published - 2019
Publication type	A1 Journal article-refereed

Funding

The authors gratefully acknowledge the financial support from ‘the graduate school of the President of Tampere University of Technology’, the ‘K.F. and Maria Dunderberg Foundation’ and Business Finland (Finnish innovation funding, trade, investment and travel promotion organization), its ‘‘Ductile and Damage Tolerant Ceramic Coatings’’ project and the participating companies. The authors would like to thank Mr. Anssi Metsähonkala of Tampere University for manufacturing the coatings. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Keywords

CrO
influence of spray parameters
mechanical properties
SHVOF
suspension spraying

Publication forum classification

Publication forum level 1

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1007/s11666-019-00940-7Licence: CC BY

Kiilakoski2019_Article_ProcessParameterImpactOnSuspenFinal published version, 4.02 MBLicence: CC BY

http://urn.fi/URN:NBN:fi:tuni-201912026472Licence: CC BY

Cite this

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abstract = "Chromium oxide (Cr2O3) is commonly used as an atmospheric plasma-sprayed (APS) coating from powder feedstock in applications requiring resistance to sliding wear and corrosion, as well as amenability to texturing, e.g., in anilox rolls. Recently, high-velocity oxy-fuel spray methods involving suspension feedstock have been considered an extremely promising alternative to produce denser and more homogeneous chromium oxide coatings with lower as-sprayed surface roughness, higher hardness and potentially superior wear performance compared to conventional APS-sprayed coatings. In this study, the impact of process parameters namely auxiliary air cleaning nozzles and a transverse air curtain on suspension high-velocity oxy-fuel-sprayed Cr2O3 suspensions is presented. The produced coatings are characterized for their microstructure, mechanical properties and wear resistance by cavitation erosion. The results reveal the importance of optimized air nozzles and air curtain to achieve a vastly improved coating structure and performance.",

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AB - Chromium oxide (Cr2O3) is commonly used as an atmospheric plasma-sprayed (APS) coating from powder feedstock in applications requiring resistance to sliding wear and corrosion, as well as amenability to texturing, e.g., in anilox rolls. Recently, high-velocity oxy-fuel spray methods involving suspension feedstock have been considered an extremely promising alternative to produce denser and more homogeneous chromium oxide coatings with lower as-sprayed surface roughness, higher hardness and potentially superior wear performance compared to conventional APS-sprayed coatings. In this study, the impact of process parameters namely auxiliary air cleaning nozzles and a transverse air curtain on suspension high-velocity oxy-fuel-sprayed Cr2O3 suspensions is presented. The produced coatings are characterized for their microstructure, mechanical properties and wear resistance by cavitation erosion. The results reveal the importance of optimized air nozzles and air curtain to achieve a vastly improved coating structure and performance.

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