Ti-6Al-4V is one of the most widely used titanium alloys nowadays and has mechanical properties and corrosion resistance superior to that of steel and aluminum alloys. Hence, new technologies have been developed due to the fact that titanium components make excellent candidates for manufacturing from powder as new repair technologies, such as thermal spray techniques.

One of these technologies would be High Velocity Air Fuel (HVAF) thermal spray method, consisting on using a mixture of combustible and compressed air for accelerating the powder stream trough a nozzle, where little research has been done on Ti-6Al-4V coatings. Therefore, in this project, High Velocity Air Fuel sprayed coatings of Ti-6Al-4V will be studied regarding its tribological properties, mechanical properties such as hardness, microstructure analysis before and after applying different heat treatments, and finally erosion performance. All of the results will be contrasted with Ti-6Al-4V substrate and also with research from the literature in order to get a better understanding of its performance.

This thesis aims to expand the study of High Velocity Air Fuel Ti-6Al-4V coatings and to set a starting point for further studies in the repairing of this alloy by coating technology.