| ZHANG Yanle,WANG Hongbo,ZENG Dejun,SUN Zhengyu.Hydrophobicity and High Temperature Resistance of BN Tube-sheet Composite Structure Modified Stainless Steel Mesh[J],54(2):213-221 |
| Hydrophobicity and High Temperature Resistance of BN Tube-sheet Composite Structure Modified Stainless Steel Mesh |
| Received:March 08, 2024 Revised:June 20, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2025.02.018 |
| KeyWord:BN nanotube BN nanosheet composite structure composites hydrophobic modification high-temperature resistance |
| Author | Institution |
| ZHANG Yanle |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| WANG Hongbo |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| ZENG Dejun |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
| SUN Zhengyu |
School of Materials Science and Engineering, Chang'an University, Xi'an , China |
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| Abstract: |
| The problems of water vapor corrosion, frosting and icing of machinery working parts in high temperature environments have always been the greatest difficulties in the operation of equipment. The application of hydrophobic materials is a key technology to effectively avoid the contact between water and machinery equipment. This study achieved a combination of hydrophobicity and high temperature resistance for stainless steel meshes, through preparing a BN tube-sheet composite structure coating on the surface of the stainless steel mesh, so as to significantly increase the surface density and the air cushion effect of the mesh. In this paper, a BN superhydrophobic nanotube-sheet composite structure was prepared on a stainless steel mesh by the mass ratio of B2O3∶B∶Fe =8∶2∶1, a BN coating on the stainless steel mesh with excellent superhydrophobic properties was obtained by chemical vapor deposition (CVD). XRD was used to analyze the phase constituent. The surface morphology at different high temperature (1 220, 1 230, 1 240, 1 250 ℃) and the weight of the material at different high temperature (650, 700, 750 and 800 ℃) were analyzed by scanning electron microscopy (S-4800) and thermogravimetric- differential thermal synchronous analyzer (TG-DTA). The hydrophobic properties of the stainless steel mesh surface were evaluated by measuring the wetting angle (JC2000D1) before and after high temperature treatment. The influence of deposition temperature on the morphology of the composite structure and the quantitative relationship between the morphology, hydrophobicity and high temperature resistance of the material were studied. The results showed that BN phase was presented for all surfaces, at the deposition temperature from 1 220 to 1 250 ℃, the diameter of the BN nanotube increased from 50 to 710 nm by high temperature chemical vapor deposition at stainless steel wires. It was found that the nanosheets of their surfaces continued to be denser. The BN nanotube sheet composite structure formed at 1 230 ℃ had a diameter of about 151 nm and was very dense. The wetting angle increased and then decreased with the increase of deposition temperature. The maximum wetting angle of 151.5° was obtained at 1 230 ℃, which achieved superhydrophobic effect. When the temperature was higher than 1 230 ℃, the diameter of the nanotubes was further coarsened and the wetting angle decreased. After a 700 ℃ high temperature oxidation resistance test, it was found that the modified stainless steel mesh still maintained a good hydrophobic effect. The BN nanotube sheet composite structure could significantly improve the surface roughness of the stainless steel mesh, and its morphology was mainly affected by the deposition temperature. The stainless steel mesh with the BN nanotube sheet composite structure deposited at 1 230 ℃ could reach a wetting angle of 151.1°. The BN nanotube composite structure can significantly improve the air cushion effect, and its morphology is mainly affected by the deposition temperature. The BN modified stainless steel mesh still maintains an excellent hydrophobic effect, which is much better than that of the polymer chemically modified material. The combination of hydrophobicity and high temperature resistance is implemented successfully, which lays a superiority foundation for the development of new high temperature resistant hydrophobic materials. |
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