Cold Spray Lab Report

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BACKGROUND The process by which kinetic energy is used to accelerate solid powder particles at an enormous velocity through a de Laval (supersonic nozzle) unto a substrate is known as cold gas dynamic spray or simply cold spray. The process is accomplished when a machine sprays on very minuscule particles of approximately 5 microns in diameter unto a surface building up layers of the particle. These particles are ejected at supersonic speeds onto a substrate, clocking over 1000m/s or Mach 4 speeds. Due to the high velocity impact of the particle, it acts as a liquid and “splashes” unto the surface of the substrate, forming a diffused bond with the surface. The heat transfer from the powder to the substrate is relatively nominal hence the name cold…show more content…
How would such material respond to the extreme conditions experienced in-service, like deformation, fretting, fatigue, corrosion, wear, etc. Prior research of experimental investigations and theoretical studies would be acknowledged so as to ensure that material and time is not wasted. Analysis of deposited material would be achieved using the commercial finite element program ABAQUS/CAE version 6.14. DESIGN TASK A method for preparing and testing a sample of the material comprises of the following steps: 1.Select material type to be used. (metals, polymers, ceramics or in combination) 2.Preparing a powder specimen of the material. (size of 15µm or thereabout) 3.Selection of an appropriate substrate. 4.Sample is fed into 3D equipment and ejected unto substrate via a high velocity inert gas. 5.Physical and chemical properties of the deposited material is tested and modelled. POTENTIAL CONTRIBUTIONS OF THE PROPOSED

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