摘要
采用常压烧结工艺制备了含复合稀土氧化物Y2O3和La2O3的Si3N4陶瓷,并利用万能试验机、显微硬度计、X射线衍射仪和扫描电镜等对Si3N4陶瓷的力学性能、相组成和显微组织进行了分析和讨论。结果表明:1600℃时随着烧结助剂的增加,致密度增加;1700℃和1750℃时随着烧结助剂的增加,致密度先增加后降低,添加8%的Y2O3～La2O3在1700℃下烧结60min,Si3N4陶瓷呈长柱状的β-Si3N4晶粒,抗弯强度为960MPa,断裂韧性为7.5MPaom1/2,具有较好的力学性能。
Si3N4 ceramics containing Y2O3 and La2O3 complex rare-earth oxides were fabricated by pressureless sintering, and their mechanical properties, phase composition and microstructura were studied by universal material testing machine, microhardness meter, X-ray diffractometer and scanning electron microscope. The results show with the increase of sintering additives, the density of Si3N4 ceramics increased at 1650℃, but increased first and then decreased at 1700℃ and at 1750℃. When 8% Y2O3-La2O3 was used as the sintering additive, the flexural strength and the fracture toughness of the sample sintered at 1700℃ reached 960MPa and 7.5MPaom1/2, and Si3N, ceramics was made of rod-like β-Si3N4 grains.
出处
《陶瓷学报》
CAS
北大核心
2012年第4期474-477,共4页
Journal of Ceramics
基金
九江学院校级科研项目(编号:10kj09)
大学生自主创新性试验项目(编号:10XSCXXSY15)
