中文摘要：

以 α-Si3N4粉、Al2O3粉、AlN 粉、Y2O3粉和 BaSi2Al2O8（BAS）粉为原料，采用热压烧结技术制备 Y-SiAlON/BAS 复合陶瓷，研究了 BAS 含量对复合陶瓷相组成、微观结构及力学性能的影响。结果表明：所制备的材料均接近完全致密（致密度〉99%），且生成了长棒状 SiAlON 晶粒，随 BAS添加量增加，α-SiAlON 含量减少，β-SiAlON 含量增加，材料硬度急剧下降，断裂韧性和弹性模量略有降低，添加 10% （质量分数）BAS 的 Y-SiAlON陶瓷具有最高的抗弯强度（775.5MPa）。长棒状 SiAlON 晶粒的拔出及裂纹偏转是 Y-SiAlON/BAS 复合陶瓷的主要增韧机制。

英文摘要：

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 in a drastic decrease in the hardness and slight decreases in the fracture toughness and elastic module. The Y-SiAlON/10% （in mass）BAS composite ceramics possessed a flexural strength of 775.5 MPa. The pull-out of elongated SiAION grain and the crack deflection both are the main self-toughness mechanisms for Y-SiAlON/BAS composite ceramics.