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Application of HVOF WC-Co-Cr coatings on the internal surface of small cylinders: Effect of internal diameter on the wear resistance

Pulsford, J.; Venturi, F.; Pala, Z.; Kamnis, S.; Hussain, T.

Authors

J. Pulsford

Z. Pala

S. Kamnis

T. Hussain



Abstract

Due to the restrictions and mediocre performance of current methods of coating complex shaped parts in which line of sight processes currently struggle, the development of new coating methods is essential, with High Velocity Oxy-Fuel (HVOF) thermal spray coatings being a good candidate. In this study, a new compact High Velocity Oxy-Air Fuel (HVOAF) thermal spray torch designed to coat internal surfaces was traversed within cylindrical pipes of internal diameters (IDs) of 70 mm, 90 mm and 110 mm and a WC-10Co-4Cr coating was applied with a commercially available powder feedstock. Powder and coating microstructures were analysed using SEM/EDX and XRD. Fracture toughness and microhardness of the coatings were measured, and dry sliding wear performance was investigated at two loads: 96 and 240 N. It was found that the coating sprayed at 90 mm (medium ID) had a lower specific wear rates at both test loads due to the highest fracture toughness and microhardness; whereas, the coating sprayed at 110 mm (high ID) showed the highest specific wear rates at both low and high conditions due to poor fracture toughness.

Journal Article Type Article
Publication Date Jul 15, 2019
Journal Wear
Print ISSN 0043-1648
Electronic ISSN 1873-2577
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 432-433
Article Number 202965
Pages 1-10
APA6 Citation Pulsford, J., Venturi, F., Pala, Z., Kamnis, S., & Hussain, T. (2019). Application of HVOF WC-Co-Cr coatings on the internal surface of small cylinders: Effect of internal diameter on the wear resistance. Wear, 432-433, 1-10. https://doi.org/10.1016/j.wear.2019.202965
DOI https://doi.org/10.1016/j.wear.2019.202965
Keywords HVOFID spray; Wear; WC-Co-Cr; Thermal spray
Publisher URL https://www.sciencedirect.com/science/article/pii/S0043164818314959

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