Experimental investigation of the laser ablation process on wood surfaces
Experimental investigation of the laser ablation process on wood surfaces
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木材表面激光烧蚀工艺的实验研究
DOI：
10.1016/s0169-4332(97)00743-5
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发表时间：
1998
影响因子：
6.7
通讯作者：
R. Dietsch
中科院分区：
文献类型：
--
作者：
M. Panzner;Gregor Wiedemann;K. Henneberg;R. Fischer;Thomas Wittke;R. Dietsch
用传统的机械工具，如锯子或刨子来加工木材，会留下一层被挤压的木材，只会轻微地附着在实木表面。激光烧蚀该层可以提高涂层和胶合接头的耐久性。对于技术应用，全面了解激光烧蚀过程是必要的。给出了准分子激光、Nd:YAG激光和tea - co2激光对不同木材类型和切割方向表面的烧蚀实验结果。利用高速摄像系统和光谱学对烧蚀过程进行了观察。通过SEM图像和能量密度对烧蚀速率的测量，验证了实验参数的影响。在红外和紫外激光波长下发现了纤维素的熔化和碳化等热效应。准分子激光和CO2-TEA激光对木材表面的损伤较弱。这可以用木材在紫外和中红外光谱范围内的高吸收来解释。作为额外的结果，这种技术提供了一种简单的方法来制备具有良好保守细胞结构的木材表面。
Processing of wood by conventional mechanical tools like saws or planes leaves behind a layer of squeezed wood only slightly adhering to the solid wood surface. Laser ablation of this layer could improve the durability of coatings and glued joints. For technical applications, thorough knowledge about the laser ablation process is necessary. Results of ablation experiments by excimer lasers, Nd:YAG lasers, and TEA-CO2lasers on surfaces of different wood types and cut orientations are shown. The process of ablation was observed by a high-speed camera system and optical spectroscopy. The influence of the experimental parameters are demonstrated by SEM images and measurement of the ablation rate depending on energy density. Thermal effects like melting and also carbonizing of cellulose were found for IR- and also UV-laser wavelengths. Damage of the wood surface after laser ablation was weaker for excimer lasers and CO2-TEA lasers. This can be explained by the high absorption of wood in the ultraviolet and middle infrared spectral range. As an additional result, this technique provides an easy way for preparing wood surfaces with excellently conserved cellular structure.