Extrusion of ceramic tubes with complex structures of non-uniform curvatures made from nano-powders |
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| Affiliation: | 1. Department of Mechanical Engineering, Wolfson Centre for Materials Processing, Brunel University, Uxbridge, Middlesex, West London UB8 3P11, UK;2. Department of Chemical Engineering, School of Engineering, Interdisciplinary Research Centre (IRC) in Materials Processing, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;1. School of Chemistry and Chemical Engineering, Huaiyin Normal University, Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, No. 111 West Changjiang Road, Huaian 223300, Jiangsu Province, PR China;2. State Key Laboratory of Materials‐Oriented Chemical Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing 210009, Jiangsu Province, PR China;1. Center for Thin Film Technologies and Applications, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan, Taipei 24301, Taiwan;2. Department of Materials Engineering, Ming Chi University of Technology, 84 Gungjuan Rd., Taishan, Taipei 24301, Taiwan;1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;3. Department of Chemical Engineering, Curtin University, Perth WA 6458, Australia;4. College of Energy, Nanjing Tech University, Nanjing 210009, China;1. Department of Mechanical Engineering, Clemson University, Clemson, SC 29631, USA;2. Nuclear Engineering Division, Argonne National Laboratory, Argonne, IL 60439, USA;3. School of Nuclear Science and Technology, Xi’an Jiaotong University, 28 Xi’an Ning West Road, Xi’an 710049, China;4. Materials Science & Technology Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-6136, USA;5. Department of Nuclear, Plasma and Radiological Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA;6. X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA |
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| Abstract: | A computer-controlled extrusion technique was introduced for making ceramic tubes (with a wall thickness of 2 mm and external diameter of 8.0 mm) with tightly controlled bends from ceramic pastes prepared from nano-size boehmite powders. Firstly, the rheological flow behaviour of the paste and related flow parameters were calculated in order to show their effect on the curvature of the tubes. Secondly, an extrusion die with three adjustable pins set 120° apart, an extrusion device and a computer program were developed. The bending of the tube is adjusted automatically through stepper motor-driven pins and 2-D or near 3-D shapes are produced by altering the geometrical flow conditions during the paste extrusion. The computer program developed allows the extrusion time to be controlled for any desired die configuration, i.e. the time between the movement of the pins in any direction, therefore, this adjustment alters the geometrical configuration for flow, inducing bending in the tube. Finally, the effects of the extrusion speed and geometrical flow conditions on the curvature and shape of the tubes were reported. It is also shown that complicated shapes, such as near helical tubes or spiral ceramic tubes can be produced by moving the pins in an appropriate manner. |
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