Abstract
Abstract Al 2 O 3 /SiC nanocomposites were synthesized by high-pressure sintering using α-Al 2 O 3 and β-SiC nanopowders as the raw materials. Microstructure and mechanical properties of the sintered samples were investigated using X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM) et al. The results indicate that high-pressure sintering is an effective sintering technique, which can densify Al 2 O 3 /SiC nanocomposites at high pressure (4.5 GPa) and relatively low temperature (1000–1230 °C). Rapid grain growth of Al 2 O 3 is mainly restrained by the separation effect of nanosized SiC grains. Grain boundary, grain boundary-intragranular and nano-nano structured Al 2 O 3 /SiC nanocomposites can be achieved by controlling the sintering temperature and β-SiC content. The highly densified Al 2 O 3 /SiC nanocomposite (AS 5 -1170) exhibits excellent mechanical properties as 429.9 GPa in elastic modulus and 30.7 GPa in nano-hardness.
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