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金属络合物激光三维物化改性技术研究
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摘要
激光表面处理技术以往主要应用于激光淬火和激光毛化等领域,它是利用了激光器功率密度高、快速加热、快速冷却的物理特点,但对于激光与物质作用时引起的化学反应,以及物理和化学反应相互作用的研究则相对较少。
     经过激光照射的某些金属络合物,可大幅度提高其表面参与电子转移和输送的能力,在改善材料的功能方面具有巨大的潜力。国外曾经利用紫外激光器完成了金属络合物的物化改性研究,但对于其它波长的物化改性原理或实验分析均未见文献报导。
     本课题对比可见(532nm)、近红外(1064nm)及中红外(10600nm)三种波长激光,聚焦后照射铜铬络合物表面,改变其分子环境,通过光裂解反应打破其化学键,分解出具有还原性的金属成分,再经过冲击镀铜、化学镀镍等方法,实现其表面不同区域内金属和非金属的共存状态。此研究领域无论是基础研究还是实际应用,都具有创新性和明显的多学科交叉特性。
     根据双原子分子非谐振子振动模型分析,不同波长的激光对金属络合物电子排布及分子结构会产生影响,进而影响其物化改性效果。对比三种波长的扫描样品,通过X光电子能谱实验(XPS)和X射线能量色散实验(EDX)分析,获得在纳米深度及微米深度附近被还原的金属元素含量差异。通过结合能谱及俄歇谱,得到反应后的铬离子及铜离子分别是+3价和+1价,仍然具备失电子的还原能力。化学镀铜、镀镍后的样品,通过X射线荧光光谱实验(XRF)分析,三种波长中1064nm样品效果最为理想,通过环境扫描电子显微镜(ESEM)分析其表面增附效果也得到相同结论。
     基于波长对比试验及三维扫描系统的模拟分析,选择以DPL Nd:YAG激光器作为三维物化改性系统的光源,配合声光调制器、小孔光阑、动态聚焦镜、X、Y振镜以及f-theta透镜组成光学三维扫描系统,并使用三轴伺服机械旋转实现多面体的自动无缝拼接。利用PCI总线与DSP输出控制信号,编写了具有扫描路径优化、曲面填充及多面体旋转拼接等功能的三维自动控制软件。
     利用该系统分析了不同调制频率对改性效果的影响,通过对比实验,找到了激光物化改性的最佳参数。以此为基础制作了手机天线的物化改性样品,并测试RF性能,取得良好效果。最后提出了一些有待进一步解决的技术问题。
The traditional laser modification technology quenched and roughened the surface by its high power density, rapid heating, rapid cooling and other physical characteristics. But little research has been done in the chemical reaction and the interaction of physical and chemical reactions in the laser processing.
     The ability of electron transmission in laser irradiated surface of metal complex, which has the huge potential in the material modification. The UV laser metal complex modification has been reported in foreign papers. But the principle or experiment by other wavelength laser has never been reported.
     A comparative study on laser physical and chemical modification of metal complex by visible wavelength (532nm), NIR wavelength (1064nm) and MIR wavelength (10600nm) is researched in this paper. Irradiated by a focused laser beam, the surface reducibility and adsorbability of copper-chromium complex are improved through photo-fragmentation and laser texturing. And the irradiated area could be chemically plated on copper and nickel. In this way, the quality of metal and nonmetal coexist on the surface of the same material. The basic research or application in this filed has the creativities and multidisciplinary characteristics.
     Based on the diatomic molecular anharmonic oscillator mode, the electronic configuration and molecular structure of metal complex are effected when irradiated by different wavelengths. Compared with three different wavelengths samples, the reduced metal percent is distinguished at the depth from nanometer to micron by XPS and EDX. Analyzed by the binding energy spectrum and the auger spectrum, the valence state of chromium ion and copper ion are +3 and +1 after radiation, which still has the reducibility to release electrons. The 1064nm sample is the most satisfactory after electroless plating, which is measured by XRF. The improvement in the surface texturing, observed by ESEM, is also the same.
     Through the comparative experiments and 3D scanning analysis, the DPL Nd:YAG is selected to be the laser source, which is assembled to the 3D scanning system with a Q-switch, a small aperture, a dynamic focusing lens, X Y scanning mirrors and an f-theta lens. The auto seamless combination has been done by the tri-axial servo rotating system. Based on the PCI bus and DSP, an auto 3D scanning software is developed with the function of auto optimization path, curved surface hatching and polyhedron rotating combination.
     The laser modified effect by different modulation frequency is analyzed in this system. And the optimum parameter is determined through the contrast experiments. Based on it, a satisfied RF capability of a laser modified cell phone antenna is obtained. The improvements are pointed out at the end of the paper.
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