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Microstructure and Tribological Behavior of Low-Temperature HVAF Ti6Al4V Coatings

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Abstract

Ti-6Al-4 V is commonly used in gas turbine engines and is sometimes subject to wear during operation. To address this, cost-effective and environmentally friendly solutions are being explored, with a focus on solid-state additive manufacturing techniques such as cold spray (CS). CS can create a dense structure; however, the existing porosity adversely affects the mechanical properties. To reduce the need for post-heat-treatment, this paper considers inner-diameter high- velocity air-fuel (ID_HVAF) as an alternative repair method which is a relatively low-temperature HVAF process that can deposit coatings with microstructures close to those observed in CS coatings. ID_HVAF process can deposit particles at high velocities and relatively low temperatures so that a significant portion of the particles forming the coatings are deposited in the solid state. This work is based on the deposition of Ti-6Al-4 V coatings using the ID_HVAF gun. During deposition, increasing the nozzle length increases the particle velocity and substrate temperature. The particles hit a softer surface with higher kinetic energy, thus increasing the density of the samples. However, HVAF will still oxidize some Ti-6Al-4 V particles and produce vanadium oxide. To study the tribological behavior, Ti-6Al-4 V counterballs were used to simulate the dovetail interface. According to the result, the top deposited layers were densified by the application of counterbalance force. Compared to an α-β Ti-6Al-4 V bulk sample, the coatings have a smaller wear track width and a greater wear depth, resulting in less wear on the counterballs. Each of the three samples shows a combination of abrasive and adhesive wear. The low cohesion between the particles in the coatings results in smaller oxide debris with a greater amount on the wear track of the coatings. By acting as a roller between the counter ball and the coating, this debris can slightly reduce the coefficient of friction.

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Acknowledgment

The authors would like to thank Drs. Jorg Oberste-Berghaus and Maniya Aghasibeig, Rakesh Bhaskaran Nair Saraswathy and Fadhel Ben-Ettouil for their help in conducting this research.

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Authors and Affiliations

  1. Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada

    P. Khamsepour & A. Dolatabad

  2. Department of Chemical and materials Engineering, Concordia University, Montreal, Québec, Canada

    P. Stoyanov

  3. Department of Mechanical, Industrial & Aerospace Engineering, Concordia University, Montreal, Québec, Canada

    C. Moreau

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Khamsepour, P., Stoyanov, P., Dolatabad, A. et al. Microstructure and Tribological Behavior of Low-Temperature HVAF Ti6Al4V Coatings. J Therm Spray Tech (2024). https://doi.org/10.1007/s11666-024-01800-9

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