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为了深入研究聚甲基丙烯酸甲酯(PMMA)的CO_2激光辐照融化特性,依据热传导和能量守恒原理,建立低功率CO_2激光辐照融化理论分析模型,解析计算CO_2激光辐照融化PMMA的激光参数阈值,分析激光参数与温度变化相互关系,采用数码显微系统、SEM扫描电镜和XRD分析仪,测试分析PMMA试样的融化形貌和组织特征变化。结果表明,激光功率密度31.8~47.7 W/cm~2可以满足PMMA融化且不发生热分解,实验结果与激光融化阈值理论计算基本相符,可为PMMA的CO_2激光融化机制及其成型工艺研究提供参考依据。
In order to further study the melting characteristics of CO_2 laser irradiated by polymethylmethacrylate (PMMA), the theoretical model of low-power CO_2 laser irradiation melting was established based on the principle of heat conduction and energy conservation. The laser parameters of PMMA irradiated by CO_2 laser were analyzed and calculated The relationship between laser parameters and temperature was analyzed. The microstructure, morphology and microstructure of PMMA samples were analyzed by digital microscope, SEM and XRD. The results show that the laser power density of 31.8 ~ 47.7 W / cm ~ 2 can satisfy the melting of PMMA without thermal decomposition. The experimental results are in good agreement with the theoretical calculation of laser melting threshold, which can provide references for the research of PMMA laser melting mechanism and its molding process. in accordance with.