Properties and Processing of Porous Si3N4 ceramics

被引：2
|
作者：
Zhao, Xiaotong [1 ]
Wang, Hailong [1 ]
Shang, Wei [1 ]
Chen, Jianbao [1 ]
Xu, Hongliang [1 ]
Lu, Hongxia [1 ]
Chen, Deliang [1 ]
Fan, Bingbing [1 ]
Zhang, Rui
机构：
[1] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China
来源：
HIGH-PERFORMANCE CERAMICS VIII | 2014年 / 602-603卷
关键词：
Porous silicon nitride; sol-gel; freeze-drying processing; porosity; thermal conductivity; SILICON-NITRIDE CERAMICS; MICROSTRUCTURE; POROSITY;
D O I：
10.4028/www.scientific.net/KEM.602-603.375
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Porous silicon nitride (Si3N4) ceramics green were prepared by sol-gel and freeze drying processing. Al2O3 and MgO were selected as sintering additives. Porous Si3N4 ceramics were sintered at 1200 similar to 1300 degrees C. The porosity of porous Si3N4 ceramics reached 60 similar to 80%, the pore size of porous Si3N4 ceramics dried by freeze drying is less than 5 mu m. Two kinds of pores were formed, including open pores with pore size of 1 similar to 5 mu m and closed pores pore size with the nanometer level. The compression strength of porous Si3N4 ceramics was 15 similar to 25 MPa. Thermal conductivity of porous Si3N4 ceramics was 0.08-0.1 W/m.K.
引用
收藏
页码：375 / 379
页数：5
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