Microstructure and mechanical properties of hot pressed Al2O3/SiC nanocomposites |
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| Authors: | M Parchovianský D Galusek J Sedlá?ek P ?van?árek M Ka?iarová J Dusza P ?ajgalík |
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| Affiliation: | 1. Faculty of Chemical and Food Technology STU, Radlinského 9, 812 37 Bratislava, Slovakia;2. Vitrum Laugaricio – Joint Glass Center of the Institute of Inorganic Chemistry, SAS, Alexander Dub?ek University of Tren?ín, and RONA, j.s.c, ?tudentská 2, 911 50 Tren?ín, Slovakia;3. Institute of Materials Research, Slovak Academy of Sciences, Watsnova 47, SK-043 53 Ko?ice, Slovakia;4. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, SK-845 36, Bratislava, Slovakia |
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| Abstract: | Al2O3/SiC micro/nano composites containing different volume fractions (5, 10, 15, and 20 vol.%) of SiC were prepared by mixing a sub-micron alumina powder with respective amounts of either micro- or nano-sized silicon carbide powders. The powder mixtures were hot pressed 1 h at 1740 °C and 30 MPa in the atmosphere of Ar. The effect of SiC addition on the microstructure and mechanical properties, i.e. hardness, fracture toughness, and room temperature flexural strength were investigated. The flexural strength increased with increasing volume fraction of silicon carbide particles. The maximum flexural strength (655 ± 90 MPa) was achieved for the composite containing 20 vol.% of coarse-grained SiC, which is more than twice as high as in the Al2O3 reference. Hardness and fracture toughness were also moderately improved. The observed improvement of mechanical properties is mainly attributed to alumina matrix grain refinement and grain boundary reinforcement. |
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