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| Abstract No.: |
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Scheduled at:
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Thursday, May 05, 2022, Hall D 2:00 PM
Cold Gas Spraying I
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| Title: |
In-situ observation of critical velocity and fragmentation mechanism of high-velocity alumina ceramic microparticle via cold spraying
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| Authors: |
ZHONGYU Wang* / Trinity College Dublin, Ireland
Shuo Yin / Trinity College Dublin, the University of Dublin, Department of Mechanical, Manufacturing and Biomedical Engineering, Parsons Building, Ireland
Wenya Li/ State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Friction Welding Technologies, Northwestern Polytechnical University, China
Rocco Lupoi/ Trinity College Dublin, the University of Dublin, Department of Mechanical, Manufacturing and Biomedical Engineering, Parsons Building, Ireland
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| Abstract: |
Metal-ceramic composite (MMC) coatings can be achieved by high-velocity impact, a type of bonding that is related to the extrusion of the substrate through the high-strain rate of the particles, a principle by which cold spraying (CS) works. In-situ observation of rebound and fragmentation of hydrodynamically sprayed ceramics during impact is shown by our home-made (Trinity lab, STAM, Ireland) high-velocity digital holographic imaging system. It is also revealed in conjunction with our previous work on accurate modelling of ceramic impact under fluid-structure interaction. While it has been agreed in previous studies that the deposition of cold sprayed ceramic is mainly dependent on its initial velocity, the present findings suggest that there exists a critical velocity at the time of spraying that causes the particles to rebound or fragmentation for deposition. In this work, we further propose a critical velocity for ceramic particles in cold spraying and present the critical velocity applicable to the particle size.
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