Characterization of porous silicon nitride ceramics by pressureless sintering using fly ash cenosphere as a pore-forming agent

被引：57
|
作者：
Shao, Yingfeng [1 ]
Jia, Dechang [1 ]
Liu, Boyang [1 ]
机构：
[1] Harbin Inst Technol, Inst Adv Ceram, Harbin 150001, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2009年 / 29卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Sintering; Porosity; Mechanical properties; Si3N4; FABRICATION; STRENGTH; POROSITY;
D O I：
10.1016/j.jeurceramsoc.2008.09.012
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：
A new method for fabricating porous silicon nitride ceramics has been developed by using fly ash cenosphere (FAC) with mean diameter of 87 mu m as a pore-forming agent. Sintering was carried out at 1780 degrees C for 2 It under a nitrogen atmosphere. FAC can also act as a sintering aid besides a pore-forming agent. X-ray diffraction (XRD) and transmission electron microscopy (TEM) studies showed that YSiO2N forms instead of Y2Si3O3N4 when FAC is incorporated. Microstructural analysis revealed that large spherical cavities are scattered in a relative dense matrix. Porous Si3N4 ceramics with density of 2.17-2.30g/cm(3), Young's modulus of 141-150 GPa and strength of 180-320 MPa were obtained by changing the FAC content. (c) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1529 / 1534
页数：6
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