Experiments of micro characteristics of pulse-transfer for micro metallic powders
| Autor: | 林峰 Lin Feng, 侯丽雅 Hou Li-ya, 杨眉 Yang Mei, 王振琪 Wang Zhen-qi, 章维一 Zhang Wei-yi |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Fabrication
Materials science Metallurgy Flow (psychology) Microfluidics chemistry.chemical_element Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Pulse (physics) Metal Chromium Experimental system chemistry law visual_art visual_art.visual_art_medium Composite material |
| Zdroj: | Optics and Precision Engineering. 19:1030-1038 |
| ISSN: | 1004-924X |
| DOI: | 10.3788/ope.20111905.1030 |
| Popis: | 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 ten μg 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. |
| Databáze: | OpenAIRE |
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