Research Of Surface Treatment Technolgoy Of Cu-containing Materials Based On 3D Laser Processing System

Laser surface treatment is a technology that to change the structure of workpiece to obtain some new features by laser irradiation. Three dimensional(3D) laser surface treatment processing is the important direction of the technology, and it has been widely used in electronics manufacturing, materials science and other fields for its advantages on high efficiency, strong controllability and pollution-free. In this research, a theoretical model of Cu to laser absorption rate is constructed based on electromagnetic propagation theory of light and Finel equation aiming at the widely used Cu included materials, and the surface treatment effects of different factors have been analyzed, such as the wavelength, laser average power, laser mode, defocusing distance, and pulse waveform. Basing on the conclusion, a 3D Laser Process system is designed and constructed, and a sample of mobile phone antenna has been made with high performance.Main work of this article contains as follows:1. Absorption Rate Model of Cu to Laser with different wavelength is built according to the transmission theory of electromagnetic wave and Finel equation. Effects of near-infrared and mid-infrared laser to surface feature of Cu material are studied, offering theoretical fundement to Laser surface treatment with Cu material. By means of SEM and XPS analysis on two treated Cu complex, effect of the treatment on Cu complex moleculer structure is explored, achieving the results of surface reduction Cu+1 content and sample surface roughness after two Laser wavelength irradiated.2. Effects of Laser power density and defoucsing distance to laser surface treatment of Cu oxide have been studied. Positive and negative defousing amount to Laser plasma Shock wave mechanical mechanism are also explored incorporation with Laser plasma action principle. Simultaneously, influences of laser to Cu surface temperature field with different defoucsing distance are analyzed on the basis of thermal conduction theory and two dimensional transient temperature field distribution models. Effects of defoucsing distance to Cu ionic state and its content of Cu surface oxide are also obtained basing on SEM and XPS analysis.3. Research of the pulse waveform influence on Cu complex surface treatment is carried out, and effects of molecular structure, surface roughness and wettability of Cu complex with different pulse waveform are also explored with combination of Laser thermal theory. Through the analysis on the surface plating thickness and adhesive force of the chemical plated sample, the best waveform of Cu complex surface treatment is achieved.4. Yb-toped fiber Laser is choosen as the system light source basing on the theoretical analysis. Laser 3D process treatment system is composed of dynamic quadropole lens, X-Y scanning galvanometer group and f-thela flat field focusing lens group, and theoreotical analysis is converted to practical experimental system basing on the design and debugging of Software and Hardware, to analyze and revise the theory and calculation.