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采用有限元软件ANSYS/LS--DYNA建立了15个颗粒与基板的冷喷涂沉积模型,通过多颗粒沉积模型预测工艺条件、不同颗粒/基板组合的沉积行为和微观形貌;制备了Al和Cu冷喷涂涂层,观察了涂层截面形貌和颗粒变形特征,并与模拟结果进行对比.结果表明,多颗粒沉积模型可预测喷涂条件对颗粒沉积过程及涂层微观特征的影响,以及不同颗粒/基板组合的界面微观形貌.当碰撞速度低时,颗粒变形不充分,颗粒交界处易形成孔洞;随着速度增加,颗粒流变填充孔洞,涂层致密.与颗粒相比,硬基板涂层/基板界面平滑,机械互锁作用小;软基板形成射流状金属挤入颗粒之间,增加结合作用.
Fifteen cold-spray deposition models of particles and substrates were established by using finite element software ANSYS / LS-DYNA. The deposition conditions and the deposition behavior and microstructure of different particles / substrate combinations were predicted by multi-particle deposition model. Al and Cu Cold spray coating was used to observe the cross-sectional morphology and deformation characteristics of the coating, and the results were compared with the simulation results.The results show that the multi-particle deposition model can predict the influence of spraying conditions on the particle deposition process and the microscopic characteristics of the coating, / Substrate combination of the micro-morphology of the interface.When the collision speed is low, the particle deformation is not sufficient, easy to form a hole at the junction of the particle; with the increase of speed, particle flow to fill the hole, the coating dense .Compared with the particles Layer / substrate interface is smooth, mechanical interlocking is small; soft substrate to form a jet-like metal squeeze into the particles, increase the binding effect.