Mechanical properties of hybrid composites prepared by ice-templating of alumina |
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| Affiliation: | 1. Central European Institute of Technology, Brno University of Technology, Czech Republic;2. Central European Institute of Technology—Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Czech Republic;1. CEITEC BUT, Brno University of Technology, Purkynova 123, 61669 Brno, Czech Republic;2. Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2896/2, 61669 Brno, Czech Republic;3. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 513/22, 61662 Brno, Czech Republic;1. Biomedical Instrumentation Laboratory, University of Alberta, Edmonton, AB, Canada;2. Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada |
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| Abstract: | Ceramic-polymer hybrid composites are often designed for its high strength and low density. Ice-templating (freeze casting) is a promising method for preparation of such composites. However, the most of the reported mechanical properties were gained from a small volume of material. In this work 70 cm3 of the lamellar composite with lamella length, up to 70 mm was prepared by ice-templating followed by polymer infiltration. The volume of ceramic (alumina) in starting suspensions was varied from 25 to 45 vol.% and the same manufacturing process was applied. The fracture toughness and flexural strength were determined on prepared beams from plates by loading in bending. The fractographic analysis conducted on the fracture surfaces and obtained mechanical properties demonstrated that an optimal strength/density ratio lies between 51 and 55% of alumina volume fraction. The density ranking from 2.6 to 2.8 cm?3 of these composites results in values of Weibull strength above 110 MPa. |
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| Keywords: | Ice-templating Alumina Epoxide Hybrid composites Strength |
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