Feedstock mixture of Al and Ti powder for cold gas dynamic spray (CGDS)
Cold gas dynamic spray, CGDS (or kinetic spray) is a rapidly developing coating and manufacturing technology in which metal particles are deposited at velocities of over 700 m/s without significant melting. The severe plastic deformation of the particles on impact produces a deposit that is very dense, with low oxide content and no thermally induced tensile stresses. This image is a SEM (secondary electron mode) micrograph of the mixture of spherical Al and Ti powders (55.2 at% Ti, 44.8 at% Al), produced by mixing the powders for 30 minutes in a Turbular mixer. The mixture was then deposited on bead blasted aluminium substrates using a CGDS system, build in the Institute for Manufacturing, Department of Engineering, University of Cambridge. Image courtesy of Dr. Tatiana Novoselova, The University of Liverpool.