人工晶体学报2011，Vol.40Issue(3)：772-778,783,8.
烧结助剂及β-Si3N4添加量对多孔氮化硅陶瓷性能的影响
Effects of Sintering Additive and β-Si3N4 Phase Contents on the Properties of Porous Si3N4 Ceramics
摘要
Abstract
Porous Si3N4 ceramics with excellent properties were successfully prepared by pressureless sintering using Lu2O3, Y203 and Al2O3 as sintering additives and pure β-Si3N4 powder as crystal seed.The influence of sintering aiddtives kind and β-Si3N4 phase contents on phase, microstructure and mechanical properties of porous Si3N4 ceramics was investigated.The results show that the resulting ceramic was composed of rod-like β-Si3N4 crystals with the length of 4.4-10.4 μm, average diameter of 0.6 μm and average aspect ratio of 6.87, when the contents of Lu2O3 and β-Si3N4 powder were 3 wt％and 5 wt％ respectively, and the flexual strength was 330.7 MPa.As the content of β-Si3N4 powder increasing, the average aspect ratio increased to 7, and the porosity of porous Si3N4 ceramics reached 48％, which led to the decrease of flexual strength.关键词
烧结助剂/氮化硅/气孔率/常压烧结/力学性能Key words
sintering additive/ Si3N4/ porosity/ pressureless sintering/ mechanical properties分类
化学化工引用本文复制引用
于方丽,于平平,王俭志,杨建锋..烧结助剂及β-Si3N4添加量对多孔氮化硅陶瓷性能的影响[J].人工晶体学报,2011,40(3):772-778,783,8.基金项目
国家自然科学基金(51072157,50821140308) （51072157,50821140308）
国家教育部博士点专项基金(20100201110036) （20100201110036）
