| LI Xiang,YAO Zhong-ping,LI Xue-jian,XU Hong,XIA Qi-xing,CHEN Chang-ju,JIANG Zhao-hua.Application of Micro-arc Oxidation Technology in Thermal Control Coating[J],48(7):24-36 |
| Application of Micro-arc Oxidation Technology in Thermal Control Coating |
| Received:March 26, 2019 Revised:July 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.07.003 |
| KeyWord:thermal control coating micro-arc oxidation solar absorptivity emissivity Ti alloy Mg alloy Al alloy |
| Author | Institution |
| LI Xiang |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| YAO Zhong-ping |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| LI Xue-jian |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| XU Hong |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| XIA Qi-xing |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| CHEN Chang-ju |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
| JIANG Zhao-hua |
College of Chemical Engineering and Chemistry, Harbin Institute of Technology, Harbin , China |
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| Abstract: |
| Thermal control coatings are widely used in aviation, aerospace and many other fields. In this paper, the working principle and types of thermal control coatings are introduced. The present research status of thermal control coatings on Ti, Mg and Al alloys by micro arc oxidation is emphatically discussed. At present, the maximum absorptivity of Ti, Mg and Al alloy ther-mal control coatings with high absorption emission ratio can reach 0.96, 0.94, 0.90, respectively; the maximum emissivity can reach 0.95, 0.87, 0.90, respectively. The absorptivity of Ti, Mg and Mg-Li alloy coatings with low absorption emission ratio can reach 0.237, 0.35, 0.33, respectively; the emissivity can reach 0.99, 0.88, 0.85, respectively. In addition, the composition, structure and morphology of the coating and the effect of micro-arc oxidation process conditions on the thermal control performance are also an-alyzed. The composition, structure and morphology characteristics of micro-arc oxidation thermal control coatings can be controlled by adjusting the electrolyte formulation and process parameters. When the reaction time is prolonged, the current density is in-creased, the thickness of the coating is increased, the roughness is increased, the absorptivity and emissivity of the coating with high absorption emission ratio are increased, the absorptivity and emissivity of the coating with low absorption emission ratio are decreased and the emissivity is increased. The addition of anions, cations or nano/micron particles in the electrolyte, or the regula-tion of the distribution of different components in the micro-arc oxidation coating plays an important role in improving the absorp-tivity and emissivity of the coating. Finally, the comprehensive properties of micro-arc oxidation thermal control coatings, the prac-tical application environment, the application of composite technology, and the development of intelligent micro-arc oxidation ther-mal control coatings are prospected. |
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