To study the effect of deposition behavior of the reinforcement on microstructure and property of cold-sprayed metal matrix composite coating, four Al5056 composite powders containing 15 wt.%, 30 wt.%, 45 wt.% and 60 wt.% SiC were mixed to prepare the composite coatings by cold spraying. Effect of the SiC deposition behavior on microstructure, SiC distribution, micro-/nanohardness, surface residual stress and shear strength of the coatings were studied. Experimental results show that the increase in SiC content in the powder increased the SiC collision with the deposited SiC particles, which caused the difference in SiC content and distribution in the composite coatings. The SiC deposition behavior caused the SiC morphology to evolve from integrity to small cracks and complete fragmentation. The SiC deposition behavior effectively influenced its peening effect on the deformed Al5056 particles, that is, as the SiC fragmentation threshold arrived, the nanohardness, surface residual stress and shear strength of the coating showed the corresponding transition point. The surface residual stress state of the deformed Al5056 matrix could in turn affect the SiC deposition by increasing the SiC deposition efficiency at the minimum compressive stress.

为了研究增强物的沉积行为对冷喷涂金属基复合涂层的微观结构和性能的影响，将四种分别含有15％，30％，45％和60％SiC的Al5056复合粉末进行了混合通过冷喷涂制备复合涂料。研究了SiC沉积行为对涂层组织，SiC分布，显微/纳米硬度，表面残余应力和剪切强度的影响。实验结果表明，粉末中SiC含量的增加增加了SiC与沉积的SiC颗粒的碰撞，这导致了SiC含量和在复合涂层中分布的差异。SiC的沉积行为导致SiC形态从完整性演变为小裂纹和完全破碎。SiC的沉积行为有效地影响了其对变形的Al5056颗粒的喷丸效果，即，随着SiC碎裂阈值的到达，涂层的纳米硬度，表面残余应力和剪切强度均显示出相应的转变点。通过在最小压缩应力下提高SiC沉积效率，变形的Al5056基体的表面残余应力状态又可以影响SiC沉积。