Development and Characterization of Phosphate-Based Glass Coatings via Suspension High-Velocity Oxy-Fuel (SHVOF) Thermal Spray Process

Bano, S.; Rincon Romero, A.; Islam, Md Towhidul; Grant, D. M.; Ahmed, I.; Hussain, T.

Abstract

Phosphate based glasses (PBGs) are promising materials for biomedical applications due to their biocompatible and fully resorbable characteristics in aqueous environments. These glasses can be coated on to metal substrate via the technique of suspension high velocity oxy-fuel (SHVOF) thermal spraying to produce nano structured coatings with improved physical and mechanical properties. PBGs coatings were produced using SHVOF thermal spray process at 50 and 75 kW flame power. The 75 kW coating was rougher (R a = 3.6 ± 0.1 µm) than the 50 kW coating (R a = 2.7 ± 0.1 µm), whereas the 50 kW coating was much thicker (24.6 ± 2.3 µm) than the 75 kW coating (16.0 ± 3.4 µm). Due to the rougher surface, the 75 kW coating showed high degradation and ion release rates. Moreover, structural changes were observed by Raman analysis, the initial glass formulation contained Q 1 (phosphate tetrahedra with one bridging oxygen) and Q 2 (phosphate tetrahedra with two bridging oxygen) species. However, the coatings showed a reduction of Q 2 species and higher concentrations of Q 1 and Q 0 (phosphate tetrahedra with no-bridging-oxygen) species, which led to lower degradation rates and reduced ion release profiles in the glass coating compared to the initial glass.

Citation

Bano, S., Rincon Romero, A., Islam, M. T., Grant, D. M., Ahmed, I., & Hussain, T. (2021). Development and Characterization of Phosphate-Based Glass Coatings via Suspension High-Velocity Oxy-Fuel (SHVOF) Thermal Spray Process. Journal of Thermal Spray Technology, 30(7), 1862-1874. https://doi.org/10.1007/s11666-021-01233-8

• Journal Article Type: Article
• Acceptance Date: Jun 9, 2021
• Online Publication Date: Jul 21, 2021
• Publication Date: 2021-10
• Deposit Date: Jul 9, 2021
• Publicly Available Date: Jul 21, 2021
• Journal: Journal of Thermal Spray Technology
• Print ISSN: 1059-9630
• Electronic ISSN: 1544-1016
• Publisher: Springer Verlag
• Peer Reviewed: Peer Reviewed
• Volume: 30
• Issue: 7
• Pages: 1862-1874
• DOI: https://doi.org/10.1007/s11666-021-01233-8
• Keywords: Materials Chemistry; Surfaces, Coatings and Films; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/5764022
• Publisher URL: https://link.springer.com/article/10.1007/s11666-021-01233-8