摘要
研究了烧结助剂质量分数及比例对热压自增韧Si3N4 陶瓷显微结构和力学性能的影响。结果表明 :材料室温抗弯强度和断裂韧性均在烧结助剂的质量分数为 15 %时达到峰值 ,其中 5 %Y2 O3+ 10 %La2 O3+ 85 %Si3N4 体系的抗弯强度达 911.3MPa,断裂韧性达10 .0 2MPa·m1 /2 。同时 ,分析了材料显微结构与力学性能的关系 ,发现自增韧Si3N4 陶瓷中 β-Si3N4
Effects of mass fraction of sintering additives and the ratio between Y2O3 and La2O3 on the microstructure and mechanical properties of Si3N4 were studied. The results show that the flexible strength and the fracture toughness of the ceramics reach their peak values when the mass fraction of sintering additives is 15%. The optimum composition is 5%Y2O3 + 10%La2O3+85%Si3N4, and the materials made from this composition exhibit the best performance with the flexible strength of 911.3 MPa and the fracture toughness of 10.02 MPa·m1/2. In addition, the relation between microstructure and mechanical properties of self-reinforced Si3N4 was discussed. It is found that the microstructure with a distinct bimodal size distribution of grain diameters is beneficial to the mechanical properties of Β-Si3N4 ceramics.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2003年第4期382-385,共4页
Journal of The Chinese Ceramic Society
基金
国防预研重点资助项目 (12 .4.2 .2 )
关键词
自增韧氮化硅
热压
烧结助剂
双峰分布
Additives
Ceramic materials
Fracture toughness
Grain size and shape
Hot pressing
Mechanical properties
Microstructure
Sintering
