Study on mechanical property prediction model of cold sprayed coating

研究了影响冷喷涂涂层力学性能的主要因素。冷喷涂涂层的主要机理是在颗粒界面真实接触区域发生的局部结合。真实接触面积承受冷喷涂层的材料强度。然而，真正的接触键合比理想的金属键合弱。而且冷喷涂层的密度比块体材料的密度低。密度降低主要发生在真实接触区域。从这些实验证据来看，真实接触区的微观组织也是影响机械性能的重要因素。因此，冷喷涂材料的强度主要取决于其真实接触面积和界面结构。

This work investigated dominant factor on mechanical properties of cold sprayed coating. Local area bonding, which is occurred in true contact area in particle interface is key mechanism of cold spray coating. True contact area bears material strength of cold sprayed coating. However, true contact bonding is weaker than ideal metallic bonding. Moreover, the density of cold spray coating is lower than that of bulk material. The density reduction is mainly occurred in true contact area. From these experimental evidences, the microstructure of true contact area is also important factor of mechanical property. Therefore, materials strength of cold spray is controlled by true contact area and interface structure of its.