Y-SiAlON/BaSi2Al2O8(BAS) composite ceramics were prepared via a hot-press sintering method using the powders of α-Si3N4,Al2O3,AlN,Y2O3 and BAS as raw materials.The effect of BAS content on phase composition,microstructure and mechani-cal properties was investigated.The results reveal that all the materials are fully densified(relative density > 99%),and are composed of the elongated SiAlON grains.The amount of α-SiAlON decreased and the amount of β-SiAlON increased with increasing the BAS content,resulting ...