Reinforcement of Al2O3–MgO composite materials by multiwalled carbon nanotubes
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Composite materials based on the Al2O3–MgO system reinforced with multiwalled carbon nanotubes (MWCNTs) were fabricated by vacuum sintering and hot pressing. The ceramic matrices were represented by corundum Al2O3 ceramic with the addition of 0.25 wt % MgO and magnesium aluminate spinel MgAl2O4. The prepared composites based on corundum and magnesium aluminate spinel containing MWCNTs were investigated by optical microscopy and scanning electron microscopy, and their microhardness and fracture toughness were studied. The samples are a densely sintered matrix with the average crystallite size of 3–5 μm with MWCNTs distributed uniformly on grain boundaries forming a reticular carcass. The samples of the Al2O3–MgO composite with 8 vol % MWCNTs demonstrated the flexural strength and fracture toughness two times higher as compared to the initial ceramic material (Al2O3 + 0.25% MgO).
Keywordscomposite MWCNTs vacuum sintering mechanical properties
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