Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2020-01-17 , DOI: 10.1016/j.surfcoat.2020.125377 Ming Pang , Xiao-Han Zhang , Quan-Xiu Liu , Yi-Xuan Fu , Guang Liu , Wen-Dan Tan
Based on the thermal elastic-plastic finite element theory and ANSYS finite element analysis software, a numerical model of Mo/8YSZ functionally gradient thermal barrier coatings prepared by the plasma spraying technology on the surface of aluminum alloy was established. The model considered the change of the thermophysical properties of the material with temperature and analyzed the influence of different preheating temperatures of the substrate on the value and distribution of the residual stress of the functionally gradient thermal barrier coating. The results showed that as the preheating temperature of the substrate increased, the distribution range of the radial residual tensile stress of the coating gradually decreased, and the distribution range of the radial residual compressive stress gradually increased. However, as the preheating temperature of the substrate increased, the distribution range of the axial residual tensile stress of the coating gradually increased and the distribution range of the axial residual compressive stress gradually decreased. With the increase of the preheating temperature of the substrate, the maximum value of the radial residual tensile stress, the maximum value of the radial residual compressive stress and the maximum value of the axial residual compressive stress of the component increased, but the maximum value of the axial residual tensile stress of the component showed a tendency of decreasing first and then increasing. Compared with the axial residual tensile stress of the component, the change of the preheating temperature of the substrate had a greater impact on the axial residual compressive stress, the radial residual compressive stress and the radial residual tensile stress of the component. Compared with other locations of the interface between the substrate and the coating, there was a larger abrupt change in the residual stress at a position about 0.5 mm from the edge of the interface. Considering the distribution of residual stress and sudden changes in stress, the preheating temperature of the substrate should be controlled at 150 °C.
中文翻译:
基体预热温度对等离子喷涂Mo / 8YSZ功能梯度热障涂层残余应力的影响
基于热弹塑性有限元理论和ANSYS有限元分析软件,建立了等离子喷涂技术在铝合金表面制备Mo / 8YSZ功能梯度热障涂层的数值模型。该模型考虑了材料的热物理性质随温度的变化,并分析了基材不同的预热温度对功能梯度隔热层残余应力的值和分布的影响。结果表明,随着基材预热温度的升高,涂层径向残余拉应力的分布范围逐渐减小,径向残余压应力的分布范围逐渐增大。然而,随着基材的预热温度的升高,涂层轴向残余拉应力的分布范围逐渐增大,轴向残余压应力的分布范围逐渐减小。随着基板的预热温度的升高,部件的径向残余拉应力的最大值,径向残余压应力的最大值和组件的轴向残余压应力的最大值增加,但是构件的轴向残余拉应力呈现先减小后增大的趋势。与部件的轴向残余拉应力相比,基板预热温度的变化对轴向残余压应力的影响更大,组件的径向残余压缩应力和径向残余拉伸应力。与基材和涂层之间的界面的其他位置相比,在距界面边缘约0.5 mm处的残余应力有较大的突变。考虑到残余应力的分布和应力的突然变化,基板的预热温度应控制在150°C。