α-SiAlON陶瓷近烧结温区显微组织演变分析  

Microstructure Evolution of α-SiAlON Ceramic in Near Sintering Temperature Range

作　　者：赵飞[1] 张玉利[2] 徐庆石 

机构地区：[1]吉林化工学院材料科学与工程学院,吉林吉林132022 [2]北京有色金属研究总院有研亿金新材料有限公司,北京102200 [3]中航工业沈阳飞机工业(集团)有限公司,辽宁沈阳110034

出　　处：《陶瓷学报》2014年第6期588-592,共5页Journal of Ceramics

基　　金：国家科技支撑计划课题(编号:2012BAE06B07)

摘　　要：为了研究α-SiAlON陶瓷近烧结温度范围内显微组织变化并分析其断裂形貌,以α-Si3N4、Al2O3及AlN作为形成α-SiAlON相的主要原料,以Y2O3作为烧结助剂,采用冷等静压成型及无压烧结工艺制备了α-SiAlON陶瓷。利用XRD分析试样相组成,用SEM观察试样显微组织形貌,用EDS分析试样的元素组成。结果表明:利用国产Si3N4粉体在1800℃烧结能够形成α-SiAlON相、短柱状颗粒形成阶段是粉末转化为柱状晶的过渡阶段、SiAlON相柱状晶的三维乱序堆叠可以有效提高陶瓷基体的抗裂纹扩展能力,进而提升陶瓷的强度和韧性。In order to study its microstructure change and fracture morphologies in near sintering range, α-SiAlON ceramic was fabricated by cold isostatic pressing and pressureless sintering, using α-Si3N4, Al2O3 and AlN as matrix powders, and Y2O3 as a sintering aid. Its samples were characterized by XRD, SEM and EDS. The results show that： α-SiAlON phase can be formed by sintering domestic α-Si3N4 particles at 1800℃; short columnar grains are formed during the transition from powders to columnar crystals; the disorderly three-dimensional stacking of α-SiAlON columnar grains can improve the crack resistance of the matrix, thus enhancing the strength and toughness of α-SiAlON ceramic.

关 键 词：Α-SIALON 柱状晶 断裂 显微组织 无压烧结 

分 类 号：TQ174.75[化学工程—陶瓷工业]