Microstructure and properties of pressureless-sintered porous Si3N4 using PMMA as pore-forming agent

作者：Zhao, Zhihao; Li, Xiaolei^*; Su, Dong^*; Meng, Qingyu; Wu, Mengjiao; Ji, Huiming

来源：Integrated Ferroelectrics, 2016, 171(1): 46-51.

DOI：10.1080/10584587.2016.1171193

• Porous Si3N4
• mechanical properties
• pore forming agents
• pressureless sintering

In this study, porous -Si3N4 ceramics containing different types of sintering additives (Yb2O3 and Lu2O3) were produced successfully by addition of PMMA (0 to 40 vol%) and pressureless sintering. The effects of PMMA content and different types of sintering additives (Yb2O3 and Lu2O3) on the microstructure and mechanical properties of the Si3N4 ceramics was studied. Porous Si3N4 ceramics with 5 wt% Yb2O3-doping had better mechanical properties than the ceramics with 5 wt% Lu2O3-doping. The flexural strength and fracture toughness of the porous Si3N4 ceramics with 5 wt% Yb2O3-doping were in ranges from 349 to 109MPa and 6.8 to 3.8 MPam(1/2) with porosity of 15-37%. With the increase of the porosity, the flexural strength and fracture toughness all decreased.

• 出版日期2016
• 单位天津大学