Experimental Study On Localized Electrodeposition Under Laser Irradiation Shock Effect

With the development and advancement of society,micro structures which are outstanding and functional are urgently demanded.Micro machining technology has been developing rapidly.As a new microfabrication technology,localized electrodeposition under laser irradiation shock effect is extremely suitable for microfabrication.Localized electrodeposition combining with laser uses mechanical shock effect and thermal effect,which is generated by irradiating the micro processing area,to change the state of the electrode and liquid mass transfer environment,and improve effectively the electrochemical processing speed and processing quality,reach the target of microfabrication.However,there are a lot of defects in the micro structure fabricated by normal localized electrodeposition,such as stoma,crackle,stray deposition.In order to overcome these defects,the experimental study on the localized electrodeposition under laser irradiation shock effect is carried out.Laser enhanced electrodeposition mechanism is analyzed,the formation of mechanical shock effect under laser irradiation has been real-time detected.The main research contents are as follows:1.The mechanism of laser enhanced electrodeposition was investigated.The basic theory of electrodeposition included: liquid phase mass transfer,electron transfer,metal crystallization.The formation of mechanical shock effect and the thermal effect in the micro processing area under laser irradiation were discussed,the mechanical and thermal models were also established based on these.Finally,the impact of mechanical shock effect and thermal effect on the localized electrochemical deposition were also discussed.According to the established mechanical and thermal model,the numerical simulation of the flow field and the micro deformation of the substrate under the micro machining process was carried out.2.The experimental system of localized electrodeposition under laser irradiation was established,including laser irradiation shock system,electrodeposition system,motion control system,process detection system,and detection equipment.Using A hydrophone was used to detect the real-time force shock effect with laser irradiation on the deposition solution,and analyzing it.3.The experimental research based on the system was carried out.In order to analyze the influence of pulse width on localization,the experimental study of localized electrodeposition was carried out with different power supply parameters.According to that,the power supply parameters were chosen.Based on that,experiment of fabricating rounded deposition was also carried out.The influence of the single pulse energy and the processing current on the localization were analyzed.Finally,the effect of different single pulse energy on the quality of the deposition were analyzed,such as grain,section grain,surface morphology,micro-hardness and processing speed.By analyzing the machining mechanism,the experimental process and results are shown that compared with the traditional localized electrodeposition,in the micro processing area,the equilibrium potential of the electrode shifts positively and stirring effect is enhanced.As a result,the electrodeposition rate is accelerated and grain is refined.The greater is the processing current,much more is the spurious deposition,the lower is the localization.With the increase of single pulse energy,much fewer is the spurious deposition,the higher is the localization.The smaller is the grain,the micro-hardness is improved.Therefore,the localized deposition with laser irradiation has great application prospect and development space.