Thermal and mechanical properties of hot pressed translucent Y2O3 doped Mg-α/β-Sialon ceramics

► The effect of different amount of Y2O3 addition on thermal, mechanical and optical properties was studied on Sialon ceramics. ► The role of different Sialon phases and intergranular phase on the properties of Sialon ceramics was studied. ► Nitrogen rich intergranular phase containing Sialon ceramics shows good mechanical properties and high thermal conductivity.