Preparation and characterization of Ternary ceramic composite Al2O3- Y2O3-ZrO2

Abstract

In this work, Ceramic samples of the Al₂O₃-Y₂O₃-ZrO₂ system were prepared using the powder technology. The chemical composition of the samples were in the hypoeutectic, eutectic and hypereutectic compositions. The XRD phase analysis revealed growth of the phases: YAM(Y₄Al₂O₉), Y₀.₁₅Al₀.₈₅O₁.₉₃(YSZ) and formation of YAlO₃(YAP) in the case of hypereutectic composition. The hardness of the hypoeutectic, eutectic and hypereutectic samples treated at 1350(ºC) had increased by 55%, 44% and 130%, respectively. This increment of the hardness could be due to the formed phases by heat treatment at 1350 ^oC.