Development and performance of a magnetic ionic liquid for use in vacuum-compatible non-contact seals |
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| Affiliation: | 1. Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku Katsushika-ku, Tokyo 125-8585, Japan;2. Department of Industrial Chemistry, Tokyo University of Science, 1-3 Shinjyuku-ku Kagurazaka, Tokyo 162-8601, Japan, Japan;1. College of Environment and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;2. School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, PR China;3. State Key Laboratory of Hollow-Fiber Membrane Materials and Membrane Processes, Tianjin 300387, PR China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. The Clean Energy Automotive Engineering Center, School of Automotive Studies, Tongji University, Shanghai 201804, China;1. Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang, 621000, People''s Republic of China;2. School of Mechatronics Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, People''s Republic of China;1. Departamento de Química (Unidad Departamental de Química Analítica), Universidad de La Laguna (ULL), La Laguna, Tenerife 38206 Spain;2. Department of Chemistry, Iowa State University, 1605 Gilman Hall, Ames, IA 50011, USA;1. College of Mechanical and Electrical Engineering, Hunan Agricultural University, Changsha 410128, China;2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China |
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| Abstract: | For the electron-beam machining of optical media, a very low rotational speed is required to enable the precise fabrication of grooves of various depths and widths. In addition, a lubricant with a very low vapour pressure, such as an ionic liquid, and a vacuum chamber are needed to avoid contamination of workpieces. Accordingly, the development of a vacuum-compatible hydrostatic bearing using an ionic liquid is required to satisfy these rotational conditions and nanometre-order machining accuracy. To use a hydrostatic bearing in a vacuum environment, a non-contact vacuum seal is needed to avoid leakage of the ionic liquid used as the lubricant. Furthermore, making a non-contact seal using an ionic liquid requires the development of a new type of magnetic ionic liquid. Therefore, this paper describes the development of such a magnetic ionic liquid, which consists of magnetite (Fe3O4) particles, a newly synthesized dispersant, and a pyridinium-based ionic liquid. The outgassed products from this magnetic ionic liquid were measured when it was applied to a non-contact seal in a vacuum of about 10−6 Pa. In addition, its mechanical properties, such as viscosity and burst pressure as a non-contact seal, were measured. From these investigations, it was found that the developed magnetic ionic liquid would meet the requirements for non-contact seals to be used in vacuum-compatible hydrostatic bearings. |
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| Keywords: | Vacuum-compatible Magnetic liquid Magnetic ionic liquid Hydrostatic bearings Non-contact seal |
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