Concordia University

Published purpose

This project aims to develop and demonstrate feasibility of emerging miniaturized combustion-based HVAF spray technology for high resolution deposition of Ti-6Al-4V with near bulk properties in terms of strength and elongation to failure. This technology can provide a step-change in the restoration of engine components in the aerospace and power generation sectors. A commercial miniature HVAF system will be used to create deposits from standard spherical powders and irregular powders. The effect of processing parameters will be investigated and optimized with the goal to attain as-sprayed porosities of 1% or lower at deposition efficiencies exceeding 30%. In flight particle diagnostic tools will be used to relate spray parameters to particle temperature and velocity and ultimately the resulting buildup, delineating suitable processing windows. In a first screening, micro hardness, anticipated for the as-spayed coatings to lay in the range of 200-400 HV, will be assessed. At conditions meeting basic criteria of porosity and hardness, 8-10 mm thick deposits will be produced. Ultimately, as-sprayed and post-treated coating characteristics will be compared.