摘要
研究了MgO-Al_2O_3-Re_2O_3(Re=Lu,Y)三元烧结助剂体系对无压烧结Si_3N_4陶瓷显微结构和力学性能的影响。研究结果表明,添加MgO-Al_2O_3-Lu_2O_3三元助剂制备的Si_3N_4陶瓷显微结构具有明显的双峰分布,晶粒较粗化,致密度、硬度、弯曲强度、断裂韧性分别为96.4%、14.59 GPa、964 MPa、7.64 MPa·m^(1/2);而添加MgO-Al_2O_3-Y_2O_3三元助剂制备的Si_3N_4陶瓷具有细化的显微结构,致密度、硬度、弯曲强度、断裂韧性分别为99.9%、15.29 GPa、758 MPa、6.60 MPa·m^(1/2)。
The effect of ternary MgO-Al_2O_3-Re_2O_3(Re = Lu,Y) additives on the microstructure and mechanical properties of Si_3N_4 ceramics was studied.Obviously bimodal distribution and coarse grains were found in the Si_3N_4 ceramics with MgO-Al_2O_3-Lu_2O_3 additives.The relative density,hardness,fracture toughness and flexural strength are 96.4%,14.59 GPa,964 MPa and 7.64 MPa ? m^(1/2),respectively.However,the Si_3N_4 ceramics with MgO-Al_2O_3-Y_2O_3 additives show fine microstructre.The relative density,hardness,fracture toughness and flexural strength are 99.9%,15.29 GPa,758 MPa and 6.60 MPa ? m^(1/2),respectively.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2016年第1期80-84,共5页
Journal of Synthetic Crystals
基金
广东省引进创新科研团队计划(2013G061)
国家自然科学基金-广东联合基金重点项目(U1401247)
关键词
SI3N4陶瓷
无压烧结
显微结构
力学性能
双峰分布
Si3N4ceramic
pressureless sintering
microstructure
mechanical property
bimodal distribution
