In this study, the effect of particle size on the microstructure and mechanical properties of cold-sprayed nickel coatings was investigated using three particle size ranges of pure nickel powders. The experimental results show that the mechanical properties of the coating fabricated by the fine powder with a D₅₀ of 25 μm are lower (microhardness and tensile strength of 257.5 HV_0.1 and 126 MPa, respectively) compared to those from the coarser particle sizes (D₅₀ = 45 μm and 67 μm) because of the higher yield strength of powder, which makes it difficult to generate sufficient plastic deformation during the spraying process. The powder with the largest particle size, D₅₀ of 67 μm, has a low impact velocity, which does not allow for a high-quality coating due to less plastic deformation, and the porosity is higher up to 0.7%. When the mean particle size of the powder is 45 μm, the coating shows the highest degree of densification, the porosity is 0.4%, and the mechanical properties of the coating are better with the microhardness and tensile strength of 289.2 HV_0.1 and 208 MPa, respectively.

在本研究中，使用三个粒径范围的纯镍粉研究了粒径对冷喷涂镍涂层的微​​观结构和机械性能的影响。实验结果表明，与较粗粒径（ D ₅₀为 25 μm ）的细粉末制备的涂层相比，其机械性能较低（显微硬度和拉伸强度分别为 257.5 HV _{0.1和 126 MPa）。 50}  =45μm和67μm）由于粉末的屈服强度较高，这使得喷涂过程中难以产生足够的塑性变形。最大粒径D ₅₀为67μm的粉末具有较低的冲击速度，由于塑性变形较小而无法获得高质量的涂层，并且孔隙率高达0.7%。当粉末平均粒径为45 μm时,涂层致密化程度最高,孔隙率为0.4%,涂层力学性能较好,显微硬度和拉伸强度分别为289.2 HV _0.1和208 MPa,分别。