Damage and wear resistance of Al₂O₃–SiC microcomposites with hard and elastic properties

Abstract

Al 2 O 3 SiC composites with different SiC contents of 010 wt % were fabricated and the effects on damage and wear resistance investigated. The composites were fabricated using spark plasma sintering at 1600°C in a partial vacuum (80 MPa). Hertzian indentation evaluations using a spherical indenter indicated that the hardness of the composite is improved by SiC addition. Wear resistance evaluated using the ball-on-disk method showed enhanced wear resistance for the composites, even when SiC addition was less than 2 wt %. Thus, Al 2 O 3 ceramics exhibited significantly improved damage and wear resistance, even though SiC addition was as small as 2 wt %.

Mechanochemical synthesis of nanostructured and composite oxide ceramics: From mechanisms to tailored properties

“…106 For example, aluminum powder could bind to many OH and CH functional groups in ethanol, changing its oxidation behavior and ultimately affecting the formation and properties of Al 2 O 3 -SiC composites. Al 2 O 3 -SiC ceramic composites could be prepared directly from a mixture of aluminum and silicon carbide compounds at a lower temperature, which have high hardness, 107 excellent insulator proper-ties, and mechanical properties. 103 This low-temperature processing not only reduces the overall energy consumption during synthesis but also helps preserve the inherent properties of the constituent materials.…”

Toughening Mechanism of Mullite Matrix Composites: A Review

“…The "intragranular" structure can weaken the effect of the main grain boundary and induce transgranular fracture, resulting in transgranular fracture instead of intergranular fracture when the material is fractured [100][101][102].…”