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Phase-inversion tape casting and synchrotron-radiation computed tomography analysis of porous alumina
Authors:Hong Fang  Chunlei Ren  Yaoge Liu  Detang Lu  Louis Winnubst  Chusheng Chen
Affiliation:1. CAS Key Laboratory of Advanced Materials for Energy Conversion and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;2. Department of Mechanical Engineering, University of Science and Technology of China, Hefei, Anhui 230026, PR China;3. Inorganic Membranes, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Abstract:A variant of tape casting based on the phase inversion phenomenon was adopted for fabrication of porous ceramic wafer. A slurry was prepared by dispersing alumina powder in an N-methyl-2-pyrrolidone (NMP) solution of the polymers polyethersulfone (PES) and polyvinylpyrrolidone (PVP). The slurry was cast using a doctor blade, and immersed in water to solidify the polymer solution via phase inversion. The green tape was dried and sintered at 1500 °C. The as-prepared ceramic wafer was characterized using synchrotron-radiation computed tomography (SR-CT). It was revealed that the ceramic wafer contained typical finger-like macrovoids, and the porosity resulting from these macrovoids was ~30%. The overall porosity of the wafer was 59%, as derived from the density data measured by Archimedes method in mercury. It is concluded that the phase inversion tape casting is a simple and effective method for preparation of porous ceramics.
Keywords:Tape casting  Phase inversion  Porous ceramics  Synchrotron-radiation computed tomography  Alumina
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