| ZOU Yang,ZHAO Li-li,YOU Li-jun,CHEN Xiao-ying,YU Yun,SONG Li-xin.Laser Irradiation Characteristics of TiO2 Thermal Control Coatings[J],48(6):189-194 |
| Laser Irradiation Characteristics of TiO2 Thermal Control Coatings |
| Received:October 05, 2018 Revised:June 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.06.022 |
| KeyWord:TiO2 thermal control coatings surface topography defect absorption preferential growth laser damage threshold photothermal performance |
| Author | Institution |
| ZOU Yang |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| ZHAO Li-li |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| YOU Li-jun |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| CHEN Xiao-ying |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| YU Yun |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
| SONG Li-xin |
Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai , China |
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| Abstract: |
| The work aims to study the structure and properties of TiO2 thermal control coatings before and after laser irradi-ation. Single-layer TiO2 and double-layer TiO2-ZrO2 thermal control coatings were prepared by air-spray method. The changes of surface morphology and the crystal structure after laser irradiation were analyzed. The changes of backside central temperature and scattering light intensity of the two coatings during laser irradiation were measured on-line, and photothermal performance of the two coatings was compared. The surface morphology of the coatings changed after irradiation, columnar dendrites and planar crystals appeared in different irradiation areas after laser irradiation, and the color of the double TiO2-ZrO2 coating center became darker. The peak value of XRD on (110) and (220) surfaces of double-layer TiO2-ZrO2 thermal control coatings increased significantly, and the preferential growth phenomenon appeared. The laser damage threshold of single-layer TiO2 coating was 500 W/cm2, 7.2 s, and that of double-layer TiO2-ZrO2 coating was 500 W/cm2, 2.5 s. After laser irradiation, the reflectivity of the two coatings at 1064 nm decreased from 97.7% to 60.1% and 97.3% to 51.0%, respectively. The solar absorption ratio αs was obviously increased and the emissivity of the two coatings decreased. The surface morphology of the coatings before and after laser irradiation is related to cracks, crystal morphology and defect absorption. The increase of Ti3+ defect and oxygen vacancy defect concentration may be the main reason for the darkening of the central region of double-layer TiO2-ZrO2 coating. The laser damage threshold of the single-layer TiO2 coating is higher, and the laser energy absorbed by the coating is more effectively dredged than that of the double-layer TiO2-ZrO2 coating, but the double-layer TiO2-ZrO2 coating has better thermal shock resistance. The photothermal performance of the two coatings decreases significantly after laser irradiation. Laser damage resistance of thermal control coatings is closely related to coating structure design and macroscopic and microscopic structures and photothermal stability of coatings during laser irradiation. |
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