Abstract No.:

Effect of SiC particle size and methods for preparing powder on the microstructure of cold spray Al5056/SiC composite coatings

Sébastien Gojon* / IRTES-LERMPS, Université de Technologie de Belfort-Montbéliard, Site de Sévenans, France
Hanlin Liao / IRTES-LERMPS, France
Christophe Verdy / IRTES-LERMPS, France
Omar El Kedim/ IRTES-LERMPS, France

To improve the mechanical properties of aluminum coating, ceramic reinforcement such as Silicon Carbide (SiC) was used resulting in metal matrix composites (MMC). Two routes were investigated to make MMC powders: a ball-milled Al5056-SiC composite and a mixed Al5056-SiC composite with the same volume fraction of SiC particles (15%vol.). Three sizes of ceramic were used (5, 15, 25 µm). For the ball-milled MMC powders, morphology and microstructure were investigated as a function of SiC grain size and ball-milling time. These different MMC powders were cold sprayed with nitrogen and air. The gas temperature and pressure were 600°C and 3 MPa. MMC coatings were deposited on aluminum alloy (Al2017) substrate. The morphology, the microstructure and the hardness of MMC coatings were characterized by optical microscopy, scanning electron microscopy and Vickers hardness. The morphology of the MMC is divided into the matrix, aluminum alloy (Al5056), and the reinforcement (SiC) embedded in the matrix. It is shown that the hardness of composite depends on the size of hard component and the preparation method.

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