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Abstract
The retention and fragmentation of the polycrystalline ceramic particles have a significant influence on the properties of the cold sprayed coatings. In this computational study, polycrystalline ceramic models were developed which demonstrated that ceramic fragmentation and retention were influenced by particle grain sizes and their impact velocities. The underlying mechanisms of crack initiation and propagation were outlined. Larger grain sizes showed higher crater depths and lower rebounding velocities, while smaller grain sizes exhibited significantly lower fragmentation. Based on the results, an optimum grain size range was proposed for lower fragmentation and higher retention. Moreover, using multiple particles and first-layer crater models, the beneficial role of surrounding metal particles on reducing fragmentation has been clarified and compared to the experimental observations. The present work provides theoretical insights on the damage mechanism and retention of ceramics during metal-ceramic composite cold spraying.
Published Version
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