The densification of Si3N4 ceramics using different additives via microwave sintering

作者：Sun Mengyong; Li Qinggang; Huang Shifeng; Cheng Xin^*

来源：Journal of the Ceramic Society of Japan, 2014, 122(1430): 914-916.

DOI：10.2109/jcersj2.122.914

• Silicon nitride
• Microwave sintering
• Mechanical properties
• Microstructure

Silicon nitride ceramics were fabricated via 2.45GHz microwave sintering at different systems which included Si3N4-Y2O3-Al2O3 system, Si3N4-Y2O3-Al2O3-ZrO2 system and Si3N4-Y2O3-Al2O3-ZrO2-Li2CO3 system. The system of Si3N4-Y2O3-Al2O3-ZrO2-Li2CO3 exhibited preferable properties which had completely phase transformation, Vickers hardness of 12 GPa and the flexure strength of 400MPa at a lower temperature of 1550 degrees C. The results also showed that ZrO2 had good ability in absorbing microwave and Li2CO3 could promote the densification. Scanning microscopy micrographs revealed the phenomenon of crack deflection, debonding and pull-out of beta-Si3N4 grains.

• 出版日期2014-10
• 单位济南大学