| ZHENG Junjie,LIU Xiangfeng,LIU Chao,FU Jiajun,WANG Qinghua.Fabrication and Repairing Performance of Superhydrophobic Zirconia Ceramic by Laser-chemical Treatment[J],53(24):165-177 |
| Fabrication and Repairing Performance of Superhydrophobic Zirconia Ceramic by Laser-chemical Treatment |
| Received:January 22, 2024 Revised:July 09, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.24.015 |
| KeyWord:zirconia ceramic superhydrophobic surface laser processing mechanical stability repairing performance |
| Author | Institution |
| ZHENG Junjie |
School of Mechanical Engineering, Southeast University, Nanjing , China |
| LIU Xiangfeng |
School of Mechanical Engineering, Southeast University, Nanjing , China |
| LIU Chao |
School of Mechanical Engineering, Southeast University, Nanjing , China |
| FU Jiajun |
School of Mechanical Engineering, Southeast University, Nanjing , China |
| WANG Qinghua |
School of Mechanical Engineering, Southeast University, Nanjing , China |
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| Abstract: |
| Zirconia ceramic shows potential application value with high-performance in the fields of structural ceramics, functional ceramics, biomaterials, and catalyst carriers. However, the inherent hydrophilicity of zirconia limits its application in some situations. Therefore, the fabrication of superhydrophobic zirconia ceramic surface through surface modification technology has important research value. Current research indicates that laser texturing can be effectively applied to prepare superhydrophobic zirconia ceramic surfaces. Nerveless, the existing femtosecond and picosecond laser processes have high costs and require long-term air post-treatment, resulting in low preparation efficiency. In addition, due to the fact that superhydrophobic surfaces are prone to fail in some harsh environments, the self-healing function of superhydrophobic surface is also limited. It is very necessary to design an efficient and low-cost laser preparation technology to achieve rapid preparation of self-healing superhydrophobic zirconia ceramic surfaces. At the stage of sample preparation, the zirconia ceramic samples were ultrasonically treated for 5 min to remove surface impurities. A laser marking machine with 355 nm ultraviolet laser light source was used to perform laser surface texture treatment (Fig.1). The laser textured sample was soaked in the mixture of 0.5 mL of silane solution for 3 h and then dried at 200 ℃ for 30 min to obtain superhydrophobic zirconia ceramic. At the stage of performance evaluation, a contact angle measurement device was used to measure the water contact angle of the surface of the laser textured zirconia ceramic. Then, the morphological characteristics and composition of the surface were analyzed by confocal laser scanning microscope, SEM, and XPS. Moreover, the mechanical stability of the superhydrophobic zirconia ceramic surface was explored through a load sandpaper friction experiment. Meanwhile, the superhydrophobic zirconia ceramic surface was repaired by silicone oil-heat method, thereby achieving the reuse of materials. The test results indicated that the laser scanning speed and spacing had obvious effect on wettability of the zirconia ceramic surface. Under the condition that the scanning speed was 20 mm/s and the scanning spacing was 100 μm, the superhydrophobic zirconia ceramic surface exhibited superior water contact angle of 159.6°. The surface had a neatly arranged and dense micro/nanostructure, which could intercept more air layers. Moreover, the composition of the superhydrophobic zirconia ceramic surface underwent significant changes during the preparation process. The surface exhibited oxidized reaction by laser ablation, resulting in the decrease of the hydrophobic groups (C—C (H)) and the increase of the hydrophilic groups (O—C==O). The surface exhibited excellent hydrophilicity with high surface energy. After silanization and heat treatment, non-polar C-F bonds in silane solution and groups such as alkyl were deposited on the surface. The superhydrophobic zirconia ceramic surface was obtained under the combined effects of relevant micro/nanostructures and low surface energy. The friction experiment results suggested the microstructure of the sample surface was destroyed under friction, and the surface wettability was also changed. Through the repair process, the surface superhydrophobicity could be restored. This was caused by the further deposition of hydrophobic groups in the silicone oil during the silicone oil-heat treatment repair process. After heat treatment, silicon atoms were deposited to form a thin film. Thus, the recovery of superhydrophobicity on the sample surface after friction was achieved. In summary, the sample surface prepared by the laser-chemical process shows excellent superhydrophobicity and self-healing properties. This provides a support for the applications of zirconia in the fields of structural ceramics, functional ceramics, biomaterials, and catalyst carriers. |
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