Numerical calculation of temperature and surface topology during a laser ablation process for ceramic coatings
Numerical calculation of temperature and surface topology during a laser ablation process for ceramic coatings
复制标题
DOI：
10.1007/s11012-015-0220-2
复制
发表时间：
2016-02-01
期刊：
影响因子：
2.7
通讯作者：
Osten, Wolfgang
中科院分区：
文献类型：
--
作者：
Weidmann, Peter;Weber, Ulrich;Osten, Wolfgang
本文提出了一种计算陶瓷厚膜激光烧蚀过程的数值方法。该代码需要涵盖温度相关的材料数据，投影光束强度和非均匀涂层-基底组合，以计算孔形状几何形状，表面下的温度分布和每个脉冲的烧蚀率。因此，烧蚀速度的计算由阿克里尼乌斯方程，而温度分布模拟的热传导方程，这是可以解决的有限差分格式。因此，使用自适应网格，并且将代码扩展到三个空间维度使得能够模拟更复杂的消融几何形状。通过引入实现频率来降低模拟时间，其中仅在必要时运行关键和耗时的步骤。数值模拟的验证是通过比较计算的温度深度分布和孔的几何形状与实验烧蚀的显微照片。
In this paper a numerical procedure is presented to calculate a laser ablation process for ceramic thick film coatings. The code is required to cover temperature dependent material data, projected beam intensities and inhomogeneous coating-substrate combinations to calculate the hole shape geometry, the temperature distribution under the surface and the ablation rate per pulse. Therefore, the ablation speed was calculated by an Arrhenius equation while the temperature distribution was simulated by means of the heat conduction equation, which is solvable by a finite differences scheme. Hence, an adaptive mesh is used and the expansion of the code to three spatial dimensions enables the simulation of more complex ablation geometries. The simulation time was held low by introducing actualization frequencies, where critical and time consuming steps were only run if necessary. A validation of the numerical simulation was done by comparing the calculated temperature depth distribution and hole geometry with micrographs of experimental ablations.