光学精密工程2011，Vol.19Issue(5)：1030-1038,9.DOI:10.3788/OPE.20111905.1030
金属微粉体脉冲输送的微特性实验
Experiments of micro characteristics of pulse-transfer for micro metallic powders
摘要
Abstract
To achieve the stable and precise transfer of micro metallic powders in the laser microcladding fabrication,the micro characteristics of micro metallic powder transfer, called pulse-transfer, are studied based on a new principle of microfluidic drive and control, in which microfluidic flows are driven by the pulsed local inertia force in micro channels. By using this technique, the flow of microfluidics can be controlled in pulse (or digital) demands. An experimental system of pulse-transfer for micro metallic powders is built to determine influencing rules of four system parameters, voltage amplitude U, frequence f, the inner diameter d of micro-nozzle, and the angle of transfer θ, on micro characteristics (powder transfer rate and stablity) of irregular micro chromium powders. The system parameters are optimized according to the influencing rules for transferring irregular micro chromium powders, and the effects of powder transfer are experimentally investigated. Experimental results indicate that the pulse-transfer system has excellent micro characteristics, and its powder transfer rate Q is within a few tenμg per second and relative stadard deviation C · V for evaluating transfer stability is smaller than 7％. The transfer of micro metallic powders with greater stability and precision is experimentally verified by using the technique of microfluidic digitalization,which demonstrates that the research method can be applied to experimental and theoretical studies of micro powder transfer in different fields of engineering.关键词
脉冲输送/粉体输送/微特性/微流体数字化/激光粉体熔融沉积Key words
pulse -transfer/ powder transfer/ micro characterisitics/ digitalization of microfluid / Direct Laser Powder Deposition(DLPD)分类
矿业与冶金引用本文复制引用
侯丽雅,王振琪,章维一,杨眉,林峰..金属微粉体脉冲输送的微特性实验[J].光学精密工程,2011,19(5):1030-1038,9.基金项目
国家自然科学基金项目(No.50975152) （No.50975152）
南京理工大学自主科研专项计划资助项目(No.2010GJPY006) （No.2010GJPY006）
教育部博士学科点专项科研基金资助项目(No.20060288005) （No.20060288005）
