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为了探索CO2激光对聚酰胺材料的热效应融化机理,在常温下,利用低功率CO2激光对聚酰胺PA12进行定位和扫描辐照融化实验,通过光学显微镜和扫描电镜(SEM)观察形貌特征,以及X射线衍射仪(XRD)分析微观结构,研究激光参数和辐照方式对融化特征的影响。实验发现,在光斑直径2 mm时,激光功率<1 W试样融化不明显,激光功率>3 W热分解显著,激光功率密度0.32 W/mm2是试样融化阈值;激光定位辐照获得固体试样的浅表层融化,当激光扫描辐照时,试样融化深度随激光功率和扫描次数的增大而加深直至完全融化;试样融化后的结晶度有明显提高。实验结果和理论研究相吻合,这对于利用CO2激光进行聚酰胺材料的微成型加工有指导意义。
In order to explore the thermal effect of CO2 laser on the melting mechanism of polyamide materials, PA12 was positioned and scanned by low-power CO2 laser at room temperature, the morphological characteristics were observed by optical microscope and scanning electron microscope (SEM) X-ray diffraction (XRD) analysis of the microstructure, the study of laser parameters and the impact of irradiation on the melting characteristics. The experimental results show that when the laser spot diameter is 2 mm, the laser power is less than 1 W, the sample melt is not obvious, the laser power is more than 3 W, and the laser power density is 0.32 W / mm2, which is the sample melting threshold. Like the superficial melting, when the laser scanning irradiation, the specimen melting depth deepens with the increase of laser power and scanning times until completely melted; the crystallinity of the sample after melting is significantly improved. The experimental results are consistent with the theoretical research, which is instructive for the micro-fabrication of polyamide materials by CO2 laser.