Y-SiAlON/BaSi_2Al_2O_8复合陶瓷的微观结构与力学性能  

Microstructure and Mechanical Properties of Y-SiAlON/BaSi_2Al_2O_8 Composite Ceramics

作　　者：吕建华 叶枫[2] 刘春凤[2] 刘利盟[2] 黄玉东[3] 周玉[2] 

机构地区：[1]北京遥测技术研究所,北京100076 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150001 [3]哈尔滨工业大学化工学院,哈尔滨150001

出　　处：《硅酸盐学报》2012年第9期1253-1258,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(90716022)资助项目

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。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.

关 键 词：SIALON 钡长石 复合陶瓷 裂纹 拔出 裂纹偏转 

分 类 号：TQ174[化学工程—陶瓷工业]