Role of MgO nanoparticles on zirconia-toughened alumina-5 wt-% CeO 2 ceramics mechanical properties

Abstract

The poor hardness of zirconia-toughened alumina (ZTA) with 5 wt-% CeO₂ (ZTA5CeO₂) ceramic has limited its applications as a cutting insert. Therefore, in this work, the possibility of MgO nanoparticles (20 nm) as reinforcement to ZTA5CeO₂ ceramics was investigated. Mgo nanoparticles with different weight percentages (0-2 wt-%) were added to ZTA5CeO₂ ceramics. ZTA5CeO₂ with 0.5 wt-%MgO showed the highest fracture toughness of 9.14 MPa.√m. The addition of 0.5 wt-%MgO nanoparticles showed the excellent role of MgAl₁₁CeO₁₉ grains as a crack deflector, which consequently produced a reasonable hardness value of 1591 HV and lowered the wear areas to 0.0528 mm².

Keywords

Cutting inserts Fracture toughness MgO nanoparticles Nose wear area ZTA

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