Fabrication of porous alumina–zirconia ceramics by gel-casting and infiltration methods |
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| Affiliation: | 1. School of Chemical Engineering, Qinghai University, Xining 810016, China;2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China;3. National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, PR China;1. School of Chemistry and Chemical Engineering, Henan University of Science and Technology, Luoyang, 471023, China;2. School of Material Science and Engineering, Zhengzhou University, NO.100 Science Avenue, Zhengzhou, 450001, China;1. Faculty of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Hodogayaku, Yokohama, Kanagawa 240-8501, Japan;2. Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogayaku, Yokohama, Kanagawa 240-8501, Japan |
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| Abstract: | Porous alumina–zirconia ceramics were obtained by infiltrating porous alumina ceramics, which were prepared by tert-butyl alcohol (TBA)-based gel-casting method. Back scattering images of the fracture surface and energy dispersive spectroscopy were performed to obtain composition profiles on the fracture surface and across sections of the sintered composites. The porosity, pore size distribution and compressive strength were also investigated. The results show that the content of zirconia can be adjusted effectively by infiltration times and it decreases with increasing distance from the surface of the samples. The porosity and compressive strength can also be controlled by the infiltration times. With increases of the infiltration times from 1 to 3 cycles, the open porosity decreases slightly from 62.43% to 56.62%, while the compressive strength of the porous alumina–zirconia ceramics increases from 13.57 ± 1.21 to 26.87 ± 2.01 MPa, indicating that the porous ceramics with high porosity and high strength can be prepared by TBA-based gel-casting method combined with the infiltration process. |
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| Keywords: | Porous ceramics Alumina–zirconia Gel-casting Infiltration |
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