Graphite and PMMA as pore formers for thermoplastic extrusion of porous 3Y-TZP oxygen transport membrane supports |
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| Affiliation: | 1. Dept. of Chemical Sciences ? University of Padova, Via F. Marzolo 1, 35131 Padova, Italy;2. CNR-ICMATE, Via F. Marzolo 1, 35131 Padova, Italy;1. Institute of Materials Science and Engineering, National Central University, Jhongli City 32001, Taiwan, ROC;2. Department of Mechanical Engineering, National Central University, Jhongli City 32001, Taiwan, ROC;3. Department of Chemical Engineering and Materials Science, Yuan Ze University, Jhongli City 32003, Taiwan, ROC;1. School of Chemical Engineering, The University of Queensland, Brisbane 4072, Australia;2. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry & Chemical Engineering, Nanjing Tech University, No. 5 Xin Mofan Road, Nanjing 210009, Jiangsu, PR China;3. Department of Chemical Engineering, Curtin University of Technology, Perth, 6102 WA, Australia |
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| Abstract: | A gas permeable porous support is a crucial part of an asymmetric oxygen transport membrane (OTM). Here, we develop feedstocks for thermoplastic extrusion of tubular, porous 3Y-TZP (partially stabilized zirconia polycrystals, (Y2O3)0.03(ZrO2)0.97)) ceramics, using graphite and/or polymethyl methacrylate (PMMA) as pore formers. The influence of pore former content and type, 3Y-TZP particle size and support sintering temperature on the microstructure, porosity and gas permeability were studied. Using at least 40 vol% pore former, consisting of graphite and PMMA in the volume ratio 2:1, tubes with gas permeability exceeding the target of 10?14 m2 are obtained. In the temperature range 1250–1400 °C the support gas permeability is insensitive to the sintering temperature, and the feedstocks shrink more than 15% during sintering, making them ideal for co-sintering with functional OTM layers. This demonstrates the suitability of thermoplastic extrusion for fabrication of porous 3Y-TZP OTM supports, or for other technologies requiring porous ceramics. |
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| Keywords: | Porosity Gas permeability Thermoplastic extrusion Oxygen transport membranes YSZ |
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