冷喷涂过程中气固两相流动行为及喷涂工艺优化研究新进展

Cold spray has been applied in producing metals or metal matrix composites coatings, additive manufacturing and repairing of components due to its solid-state deposition nature and prominent metallurgical advantages and has been attracting more and more scholars and entrepreneurs around the world in recent years. In the last ten years, great progess has been made on the theoretical study of bonding mechanisms in cold spray. The acceleration behavior of particles during cold spray is an important prerequisite for understanding the bonding mechanisms. Therefore, in this paper, the state-of-the-art of gas-solid two-phase flow behavior during cold spray and process parameters optimization were summarized by referring to the relevant research results in recent ten years and the experience of the authors. Firstly, the aerodynamic characteristics inside and outside the cold spray nozzle were analyzed. Secondly, the acceleration and heating behaviors of cold spray particles were discussed. And then, the optimization strategy of process parameters in cold spray was introduced. Finally, the research perspective was given.