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.

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.

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

• Journal Article Type: Article
• Acceptance Date: Jul 10, 2019
• Online Publication Date: Jul 11, 2019
• Publication Date: Jul 15, 2019
• Deposit Date: Jul 16, 2019
• Publicly Available Date: Jul 17, 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
• DOI: https://doi.org/10.1016/j.wear.2019.202965
• Keywords: HVOFID spray; Wear; WC-Co-Cr; Thermal spray
• Public URL: https://nottingham-repository.worktribe.com/output/2312996
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0043164818314959
• Contract Date: Jul 16, 2019