Abstract
Hydroxyapatite coating have been deposited on titanium alloys (Ti–6Al–4V) substrate by varying plasma power from 20 to 35 kW using atmospheric plasma spraying. Effect of plasma power variation on the microstructure as well as corrosion behaviour of the coatings has studied exhaustibly in simulated body fluid (SBF). Microstructural analysis revealed that increasing the plasma power from 20 to 35 kW has led to a more densified coating by minimizing the level of porosity and partially melted region as well. This enhanced property is attributed to the higher velocity of the in-flight particles with their shorter residence time at 35 kW. The molten particles strike the substrate without losing much of its energy during its flight, which further boosted the closed packing of the coating layers ensuing a reduced inter-splat region. These improved microstructural properties also escorted to enhancement in corrosion resistance with increase in the plasma power. This enhancement in corrosion behaviour at higher power is attributed to reduction in pores and voids in the coatings which hindered the penetration of SBF solution into the coatings.
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The authors acknowledge the financial support from the Indian Institute of Technology, Patna, Bihar. Authors Anup Kumar Keshri and Krishna Kant Pandey acknowledge the financial assistance received from Indian Space Research Organization, Government of India (ISRO/ RES/3/735/16–17).
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Singh, S., Pandey, K.K. & Keshri, A.K. Effect of Plasma Power on Corrosion Behaviour of Plasma Sprayed Hydroxyapatite Coatings. Met. Mater. Int. 27, 4455–4462 (2021). https://doi.org/10.1007/s12540-020-00704-x
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DOI: https://doi.org/10.1007/s12540-020-00704-x