Image icon  Cold Gas Dynamic Spray (CGDS): as-sprayed Al/Ti deposits

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Description: 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 an optical micrograph on as-sprayed Al/Ti deposits (feedstock mixture of spherical Al and irregular sponge Ti powders), showing characteristic duplex microstructure. The as-sprayed state shown consists of an Al “matrix” with larger irregular particles of sponge Ti embedded in it. As can be seen, the small Al particles have coalesced into a single mass, by plastic deformation, with just few pores being visible (porosity is less than 3%). The Al/Ti mixture was deposited using a CGDS system, build in the Institute for Manufacturing, Department of Engineering, University of Cambridge.
Keywords: cold spray • CGDS • cold gas spray • coating • deposition • aluminium • titanium • powder • micrsocopy • porosity • image
Categories: Materials > Metals & alloys > Aluminium & alloys
Materials > Metals & alloys > Titanium & alloys
Processes > Shaping > Spraying
Processes > Shaping > Powder methods
Processes > Surface treatments > Surface coatings
Testing, analysis & experimentation > Microscopy
Created by: Dr. Tatiana Novoselova, The University of Liverpool
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Date created: 27 January 2004
Date added: 17 May 2011
Resource ID: 3640