Abstract
The introduction of pores to improve the toughness of alumina ceramics is considered to be a feasible strategy by using the inhibitory effect of pores on crack propagation. However, the mechanical properties of alumina ceramics are often reduced due to the uncontrollable pore shape. In this work, the nano-scale C@Al2O3 core-shell particles were fabricated and introduced into the alumina powder treated by dielectric barrier discharge plasma-assisted milling, and the alumina ceramics with closed pores of regular shape (approximate sphere) and small size (<1 μm) were prepared. Since the approximate spherical pore structure and small pore size eliminate the adverse effects of stress concentration, and the deflection and pinning effect of closed pores on cracks, the flexural strength and fracture toughness of the prepared samples were improved, increasing by 12.6 % and 18.8 % respectively.
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