Abstract
Abstract Al 2 O 3 –17 vol.% SiC nanocomposites were prepared by powder mixture of submicrosized α-Al 2 O 3 , nanosized γ-Al 2 O 3 and different nanosized β-SiC. Materials were sintered by spark plasma sintering (SPS) technique at two temperatures (1400–1550 °C) and their electrical conductivity and mechanical properties were investigated. High-density composites have been achieved even at the lowest sintering temperatures and the microstructure characterization shows SiC particles located both within the Al 2 O 3 matrix grains and/or at the Al 2 O 3 grain boundaries. It has been demonstrated that microstructure tailoring is possible by suitable selection of starting materials and fast sintering by SPS. Accurate design of nanocomposites microstructures allows obtaining moderately conductive ( 8 Ω cm) materials while the chemical composition is similar.
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