| FENG Yong-bing,MAO Shui-qiang,CHEN Yi-ping,CHENG Hui-yang,LIN Jun-cen,YU Min-bo.Laser Cleaning Process of Wire Clamp of Pure Aluminum and Its Effect on Electrical Conductivity[J],51(9):387-394 |
| Laser Cleaning Process of Wire Clamp of Pure Aluminum and Its Effect on Electrical Conductivity |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.09.041 |
| KeyWord:laser dry cleaning wire clamp surface morphology, mass percentage of elements conductivity |
| Author | Institution |
| FENG Yong-bing |
Jinhua Power Transmission Engineering Co., Ltd., Zhejiang Jinhua , China |
| MAO Shui-qiang |
Jinhua Power Transmission Engineering Co., Ltd., Zhejiang Jinhua , China |
| CHEN Yi-ping |
Jinhua Power Transmission Engineering Co., Ltd., Zhejiang Jinhua , China |
| CHENG Hui-yang |
Jinhua Power Transmission Engineering Co., Ltd., Zhejiang Jinhua , China |
| LIN Jun-cen |
Jinhua Power Transmission Engineering Co., Ltd., Zhejiang Jinhua , China |
| YU Min-bo |
Hangzhou Yingmin Technology Co., Ltd., Hangzhou , China |
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| Abstract: |
| Laser dry cleaning method was used to clean the oxidized surface of assumed pure aluminum wire clamp. Nanosecond pulsed laser was used to clean the oxidized surface of pure aluminum plate, the surface morphology before and after laser dry cleaning was observed under Scanning Electron Microscope (SEM), and the mass percentages of elements were tested and then analyzed by X-ray Energy Dispersive Spectrometer (EDS). Then the surface conductivity was measured by conductivity tester (SIGMATEST 2.069). The surface morphology of aluminum plate before and after laser dry cleaning was observed by ultra depth of field three-dimensional microscope. The influence of laser dry cleaning on the surface morphology, element content and conductivity was studied, and the best laser dry cleaning process parameters were determined. Results show that O and Cl elements on the oxidized surface could be effectively removed by laser dry cleaning. After cleaning, the mass percentages of Al, O, and Cl on the surface could reach 94.02%, 5.95% and 0.03% respectively. The mass percentage of Al increased at most 151.66% compared with the 37.36% of the oxidized surface, while the O and Cl elements decreased at most 90.01% and 99.03% respectively compared with the 59.55% and 3.09% of the surface without cleaning. The surface conductivity after cleaning could reach 34.88 MS/m, 9% higher than 32.00 MS/m of the oxidized aluminum plate surface. When the laser energy density is too low, it is not enough to vaporize the oxide on the surface of aluminum plate; When the laser energy density is too high, the oxide on the surface of aluminum plate vaporizes, but at the same time, it also leads to a higher heat input, and due to the active chemical properties of aluminum, the surface of aluminum plate would be oxidized again. Finally, the optimal laser dry cleaning process parameters was determined as follows:laser power 120 W, repetition rate 60 kHz, scanning speed 2 875 mm/s, hatching space 0.058 mm, scanning times 3 times. Laser dry cleaning can effectively remove the impurity elements on the surface of oxidized aluminum plate, which greatly increases the mass percentage of aluminum element, and therefore improves the surface conductivity of aluminum plate. |
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