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        Multi-Scale Mechanical Behaviour of a Highly Porous Alumina Based Foam

        Dorel Buncianu,Nicolas Tessier‑Doyen,Joseph Absi,Radu Negru,Liviu Marşavina 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10

        This work aims to characterize mechanical properties (strength and fracture toughness) of an alumina-based ceramic foamexhibiting a pore volume fraction around 88% with a multi-scale porosity ranging from 300 to < 2 μm with a slight interconnectivityof cells. Young’s modulus determined by three different methods (resonance, ultrasonic and compression) has beenestimated to approximately 4 GPa which is a remarkable value for materials exhibiting such a porous volume. Moreover,regarding solid material, a value of 380 GPa taking into account the imperfect purity of alumina and the effect of grainboundaries has been determined by indentation at nano-scale. Values predicted by Ashby–Gibson and Pabst analytical modelsprovide reliable results concerning the significant interconnectivity of porous cells in the microstructure. Finally, compressive,bending strengths and fracture toughness are respectively close to 2 MPa, 1 MPa and 0.1 MPa m1/2. These values arein agreement with the results obtained by some authors for alumino-silicate based foams exhibiting close compositions.

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