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以TiO_2为颜料,硅酸钾为粘结剂(以下简称KS-T),采用空气喷涂的方法,在铝基底上制备了一种抗激光烧蚀涂层。研究了粉体粒径大小、固含量、涂层厚度等因素对涂层反射率的影响,获得了1064 nm激光波段下反射率达到96.8%的KS-T涂层。基于热传导方程建立三维有限元模型模拟材料的瞬态温度场分布,测量激光辐照过程中铝基底的背底温度变化,与模拟结果相比较,发现KS-T涂层可以有效地保护基底不被激光烧蚀。模拟结果显示,在辐照一段时间后,样品的反射率出现了下降的现象,分析了反射率下降的可能原因;计算结果还表明考虑界面热阻(ITR)后,涂层/基底界面处出现一个明显的温降,阻止热流向基底的传输,从而使铝基底保持一个较低的温度。
With TiO 2 as a pigment and potassium silicate as a binder (KS-T for short), an anti-laser ablation coating was prepared on an aluminum substrate by air spraying. The influence of particle size, solid content and coating thickness on the reflectivity of the coating was investigated. The KS-T coating with 96.8% reflectivity at 1064 nm was obtained. Based on the heat conduction equation, a three-dimensional finite element model was established to simulate the transient temperature field distribution and measure the temperature change of the aluminum substrate during the laser irradiation. Compared with the simulation results, it was found that the KS-T coating can effectively protect the substrate from being Laser ablation. The simulation results show that after a certain period of irradiation, the reflectivity of the sample appears to decrease, and the possible reasons for the decrease of reflectivity are analyzed. The calculation results also show that the appearance of the coating / substrate interface appears after considering the ITR A significant drop in temperature prevents the transfer of heat to the substrate, keeping the aluminum substrate at a lower temperature.