| Inorganic Materials and Ceramic Matrix composites |
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| Surface Modification of Nano TiO2 Powders by Dielectric Barrier Discharge Plasma Assisted Ball Milling |
| WEI Yukun1, 2, LIAO Haifeng1, 2, YAN Haitao1, 2, WU Xiaole3, DAI Leyang1, 2
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1 Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, School of Marine Engineering, Jimei University, Xiamen 361021, China
2 Fujian Shipping Research Institute of Jimei University, Xiamen 361021, China
3 Jiujiang Military Representative Office of the General Armament Department, Jiujiang 332000, China |
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Abstract In order to improve the dispersive stability of nano TiO2 powders in lubricating oil, several surface modifiers, such as stearic acid, oleic acid, quaternary ammonium salt/sodium laurate and so on, have been selected to prepare surface modified nano TiO2 powders by dielectric barrier discharge plasma assisted ball milling for 11 h. These prepared samples were analyzed by SEM, FT-IR, XPS, XRD, TG-DSC and lipophilic degree. The results show that the particle size of TiO2 powder prepared by ball milling is between 50—200 nm. The crystallite size decreases by 12%—68% and the lattice distortion increases significantly. The nano TiO2 powders are in situ modified by lipophilic groups -CH2 and -CH3 in the modifier on the surface. The lipophilicity of modified nano TiO2 powders has been improved dramatically because of stable covalent chemical bonds formed by the chemical reaction between carboxylic acids in organic compounds and hydroxyl groups on the surface of TiO2, which results in the improvement of dispersion stability of nano TiO2 in lubricating oil. In the ball milling assisted by high-energy plasma, the rapid heating effect of plasma is one of the main reasons for promotion of the TiO2 powder refinement, improvement of the powder activity and effect of the surface modification.
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Published: 14 July 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51779103), Fujian Science and Technology Planning Project (2018H0026), the Natural Science Foundation of Fujian Province (2019J01708), Open Research Fund of Fujian Shipping Research Institute of Jimei University. |
About author:: Yukun Wei, a graduate student in the School of Marine Engineering, Jimei University, mainly studies the preparation of nano-composite lubricant additives and its application in marine engineering.
Leyang Dai,a professor and doctoral supervisor at the School of Marine Engineering, Jimei University. In 2006, he obtained a Ph.D. in materials processing engineering from South China University of Technology. He has published more than 30 papers in domestic and foreign academic journals and applied for 8 national invention patents. His research focus: prevention and control of marine engine friction and wear, ocean corrosion and protection, turbine fault diagnosis, etc. |
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2020, Vol. 34 
