| MA Chunsheng,ZHANG Ziyu,YU Changxin,LIU Xue,JIANG Bo,LI Linsen,FU Jingguo.Effect of Electrical Parameters on Bonding Strength and Preparation of AlSn20Cu Microarc Oxidation Ceramic Layers[J],54(11):211-220, 242 |
| Effect of Electrical Parameters on Bonding Strength and Preparation of AlSn20Cu Microarc Oxidation Ceramic Layers |
| Received:October 14, 2024 Revised:October 31, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.11.018 |
| KeyWord:aluminum tin copper alloy microarc oxidation frequency duty cycle bonding strength |
| Author | Institution |
| MA Chunsheng |
Department of Marine Engineering, Dalian Maritime University, Liaoning Dalian , China |
| ZHANG Ziyu |
Department of Marine Engineering, Dalian Maritime University, Liaoning Dalian , China |
| YU Changxin |
Wafangdian Bearing Group Co., Ltd., Liaoning Dalian , China |
| LIU Xue |
Wafangdian Bearing Group Co., Ltd., Liaoning Dalian , China |
| JIANG Bo |
Wafangdian Bearing Group Co., Ltd., Liaoning Dalian , China |
| LI Linsen |
Dalian Maritime Safety Authority, Liaoning Dalian , China |
| FU Jingguo |
Department of Marine Engineering, Dalian Maritime University, Liaoning Dalian , China |
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| Abstract: |
| This work aims to meet the needs of high power density, high reliability and lightweight development of engines, improve the surface comprehensive properties of the main raw material of engine plain bearings (aluminum tin copper alloy), and promote the development of surface strengthening treatment technology for aluminum-tin-copper alloy. The influence of power frequency and forward duty cycle on AlSn20Cu alloy surface microarc oxidation ceramic layers are investigated by the control variable method. The frequency is set at 300, 600, 900, 1 200 and 1 500 Hz, and the forward duty ratio is set at 11%, 30%, 50%, 70% and 89%. The micromorphologies, thickness, porosity and average pore size, surface hardness, phase composition, surface stress, average grain size, bonding state, surface roughness and elastic modulus of ceramic layers are characterized and analyzed by Scanning electron microscopy, Image J software, Micro-Vickers hardness tester, X-ray diffractometer, X-ray high-load scratch meter, Optical profiler and Micro-nano mechanics testing system. The main results show that the changes of power supply frequency and duty cycle affect the growth process of ceramic layers by changing the total effective working hours in a single cycle of pulse current (the total time is shortened with the increase of frequency, and the total time is increased with the increase of duty cycle), and then the thickness, surface hardness, surface stress and elastic modulus of ceramic layer show a corresponding change trend along with the intensity of reaction. When the frequency and duty cycle reach a certain value, the ceramic layer shows excellent bonding strength by virtue of suitable growth rate, surface stress and elastic modulus. The bonding strength stands for the bonding state of ceramic layers and substrates, and self-strength of layers. Ceramic layers have significantly different performance indicators prepared by different power frequency and duty cycle. The change of power frequency influences the time of a single cycle, and the change of duty cycle determines the effective working hours of the current in a single cycle. The increase of the corresponding time makes the microarc oxidation reaction more intense, raises the reaction energy, and then increases the thickness, average grain size, elastic modulus, surface stress and surface roughness of the ceramic layer. However, the influence on the chemical composition, porosity, average pore size and surface hardness is relatively weak. The elastic modulus and surface stress state are directly related to the brittleness and fatigue resistance of coatings, so it is necessary to select the appropriate preparation process parameters based on a number of performance indicators. Compared with the power supply frequency, the duty cycle possesses a more significant effect on the coating growth process. When the duty cycle is too high, the ceramic layer will obviously crack, fall off, and even the matrix is damaged. Therefore, the effective working hours of the current in a single cycle has a greater influence on the ceramic layer than the time of a single cycle. This result can provide important references for the research and development of microarc oxidation power supply. With the increase of the power supply frequency, the binding force of coatings showed a trend of rapid increase at first and then basically unchanged. With the increase of duty cycle, the binding force of coatings increases first and then decreases. This is directly related to the elastic modulus and the surface stress state of coatings. Under the experimental conditions, the ceramic layer prepared with power frequency of 900 Hz and duty ratio of 30% has excellent bonding strength. |
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