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Mechanical and Tribological Properties of Cold-Sprayed Ti Coatings on Ti-6Al-4V Substrates

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Abstract

A cold spray process was used to deposit titanium (Ti) coatings of different thicknesses on commercial Ti-6Al-4V (Ti64) substrates. The hardness of the Ti coatings was measured using a Vickers micro-indenter. It was found that the thicker Ti coatings had higher hardness probably due to the better uniformity and higher density of the coatings. The tribological results showed that the friction and wear of the Ti coatings tested against a steel ball under dry condition became lower with higher thickness probably due to the higher wear resistance of the thicker coatings associated with their higher hardness. The specific wear rates of all the Ti coatings were significantly lower than that of the Ti64 substrate as a result of the higher wear resistance of the Ti coatings associated with their cold-worked microstructures and the formation of high wear resistant oxide layers on their wear tracks during the wear testing.

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Acknowledgments

Authors are grateful for the financial support from the National Research Foundation (NRF), Rolls-Royce (RR), and Nanyang Technological University (NTU), Singapore, with the NRF-RR-NTU research Grant Number of M-RT3.1, and the project team members from RR, Singapore, Harry Eyre, Anna Tai and Nicholas Weeks for their contributions in this work.

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Khun, N.W., Tan, A.W.Y. & Liu, E. Mechanical and Tribological Properties of Cold-Sprayed Ti Coatings on Ti-6Al-4V Substrates. J Therm Spray Tech 25, 715–724 (2016). https://doi.org/10.1007/s11666-016-0396-6

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  • DOI: https://doi.org/10.1007/s11666-016-0396-6

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