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

Yingfeng Shao; Dechang Jia; Boyang Liu

doi:10.1016/j.jeurceramsoc.2008.09.012

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

Yingfeng Shao
, Dechang Jia^*
, Boyang Liu

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

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.

Original language	English
Pages (from-to)	1529-1534
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	29
Issue number	8
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2008.09.012
State	Published - May 2009

Keywords

Mechanical properties
Porosity
SiN
Sintering

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10.1016/j.jeurceramsoc.2008.09.012

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

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.",

keywords = "Mechanical properties, Porosity, SiN, Sintering",

author = "Yingfeng Shao and Dechang Jia and Boyang Liu",

year = "2009",

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TY - JOUR

T1 - Characterization of porous silicon nitride ceramics by pressureless sintering using fly ash cenosphere as a pore-forming agent

AU - Shao, Yingfeng

AU - Jia, Dechang

AU - Liu, Boyang

PY - 2009/5

Y1 - 2009/5

N2 - 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.

AB - 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.

KW - Mechanical properties

KW - Porosity

KW - SiN

KW - Sintering

UR - https://www.scopus.com/pages/publications/62749127070

U2 - 10.1016/j.jeurceramsoc.2008.09.012

DO - 10.1016/j.jeurceramsoc.2008.09.012

M3 - 文章

AN - SCOPUS:62749127070

SN - 0955-2219

VL - 29

SP - 1529

EP - 1534

JO - Journal of the European Ceramic Society

JF - Journal of the European Ceramic Society

IS - 8

ER -

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

Abstract

Keywords

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