Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1475647 | Journal of the European Ceramic Society | 2009 | 6 Pages |
Abstract
A new method for fabricating porous silicon nitride ceramics has been developed by using fly ash cenosphere (FAC) with mean diameter of 87 μm as a pore-forming agent. Sintering was carried out at 1780 °C for 2 h 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 2.17–2.30 g/cm3, Young’s modulus of 141–150 GPa and strength of 180–320 MPa were obtained by changing the FAC content.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Yingfeng Shao, Dechang Jia, Boyang Liu,