冷喷涂TC4涂层临界沉积速度计算及制备涂层性能研究
发布时间：2019-03-29 06:14
【摘要】：目的研究冷喷涂TC4涂层的临界沉积速度及粒子温度对临界沉积速度的影响规律,并研究气体压强对沉积涂层性能的影响规律。方法理论研究上,采用有限元LS-DYNA软件中的Johnson-Cook塑性模型,选取3D164计算单元建立模型,研究粒子在不同温度和不同速度下碰撞基体后的形貌特征,确定粒子沉积临界速度。试验研究上,采用N_2作为冷喷涂驱动气体,在TC4合金上制备TC4涂层,然后采用SEM、Image J图像分析软件、硬度计等分析已沉积涂层的孔隙率和硬度等性能。结果 25、400、500、600℃温度下,计算表明10μm的TC4合金粒子在TC4基板上的临界沉积速度分别为730、465、392、361 m/s,即随粒子温度升高,粒子临界沉积速度降低,粒子沉积成涂层更容易。采用冷喷涂工艺在TC4基板上沉积TC4涂层,在N_2温度600℃、气体压力3 MPa的条件下,制备的TC4涂层厚度约1000μm,与TC4钛合金基体结合紧密,涂层孔隙率约为6.46%。结论气体温度升高,粒子临界沉积速度降低;气体压强变大,制备的涂层厚度就大且更加致密。
[Abstract]:Aim to study the effect of critical deposition velocity and particle temperature on the critical deposition rate of cold sprayed TC4 coating and the effect of gas pressure on the properties of the coating. Methods in the theoretical study, the Johnson-Cook plastic model of finite element LS-DYNA software was used to establish the model with 3D164 calculation unit. The morphologies of particles after collision at different temperatures and speeds were studied, and the critical velocity of particle deposition was determined. In the experiment, TC4 coating was prepared on TC4 alloy by using N _ (2) as the driving gas of cold spraying. Then, the porosity and hardness of deposited coating were analyzed by SEM,Image-J image analysis software, hardness tester and so on, and the porosity and hardness of deposited coating were analyzed by using SEM,Image-J image analysis software and hardness tester. Results at 25400500600 鈩，
本文编号：2449231
[Abstract]:Aim to study the effect of critical deposition velocity and particle temperature on the critical deposition rate of cold sprayed TC4 coating and the effect of gas pressure on the properties of the coating. Methods in the theoretical study, the Johnson-Cook plastic model of finite element LS-DYNA software was used to establish the model with 3D164 calculation unit. The morphologies of particles after collision at different temperatures and speeds were studied, and the critical velocity of particle deposition was determined. In the experiment, TC4 coating was prepared on TC4 alloy by using N _ (2) as the driving gas of cold spraying. Then, the porosity and hardness of deposited coating were analyzed by SEM,Image-J image analysis software, hardness tester and so on, and the porosity and hardness of deposited coating were analyzed by using SEM,Image-J image analysis software and hardness tester. Results at 25400500600 鈩，
本文编号：2449231
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