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Zhu, Jinpeng; Ma, Zhuang; Gao, Yinjun; Gao, Lihong; Pervak, Vladimir; Wang, Lijun; We, Chenghua; Wang, Fuchi (2017): Ablation Behavior of Plasma-Sprayed La1-xSrxTiO3+delta Coating Irradiated by High-Intensity Continuous Laser. In: ACS Applied Materials & Interfaces, Vol. 9, No. 40: pp. 35444-35452
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Abstract

Laser protection for optical components, particularly those in high-power laser systems, has been a major concern. La1-xSrxTiO3+delta with its good optical and thermal properties can be potentially applied as a high-temperature optical protective coating or high-reflectivity material for optical components. However, the high-power laser ablation behavior of plasma-sprayed La1-xSrxTiO3+delta (x = 0.1) coatings has rarely been investigated. Thus, in this study, laser irradiation experiments were performed to study the effect of high-intensity continuous laser on the ablation behavior of the La1-xSrxTiO3+delta coating. The results show that the La1-xSrxTiO3+delta coating undergoes three ablation stages during laser irradiation: coating oxidation, formation and growth of new structures (columnar and dendritic crystals), and mechanical failure. A finite-element simulation was also conducted to explore the mechanism of the ablation damage to the La1-xSrxTiO3+delta coating and provided a good understanding of the ablation behavior. The apparent ablation characteristics are attributed to the different temperature gradients determined by the reflectivity and thermal diffusivity of the La1-xSrxTiO3+delta coating material, which are critical factors for improving the antilaser ablation property. Now, the stainless steel substrate deposited by it can effectively work as a protective shield layer against ablation by laser irradiation.