Preparation of the System of MgO-CaO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-Y<sub>2</sub>O<sub>3</sub><sub> </sub>Wear-Resistant Alumina Ceramics

In order to improve the wear resistance and reduce the sintering temperature of alumina ceramics, Y 2 O 3 powder added in the system of MgO-CaO-SiO 2 -Al 2 O 3 alumina ceramics were prepared by the technique of pressureless sintering. The properties of the ceramic samples were investigated by the measurements of bulk density, wear rate, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the wear rate of alumina ceramic contenting Y2O3 of the 0.8wt% is 0.041‰. Adding the yttrium oxide to the raw materials and then calcine them to ceramics, which can reduces the sintering temperature, promote the densification and improve wear-resistant property of alumina ceramics.