Deposition of aluminum powder by cold spray micronozzle

Spatial resolution of cold spray depends on the exit dimension of converging-diverging nozzle used for particle acceleration. Typical diameter of cold spray nozzle lies in the range between 4 and 10 mm. In this study, micronozzle with 0.5 mm throat diameter and 1 mm exit diameter is applied for cold spray deposition of aluminum powder. Numerical simulation and experimental velocity measurements demonstrate that aluminum particles could be accelerated to the velocity sufficient for coating deposition if room temperature helium is applied as working gas. The diameter of spraying spot in this case does not exceed 1.7–1.8 mm that is significantly lower than for standard cold spray nozzle. However, the density and the bond strength of obtained aluminum coating are significantly lower than those for standard cold spray aluminum deposits.

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