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CLC number: TQ174

On-line Access: 2010-10-05

Received: 2010-03-29

Revision Accepted: 2010-06-03

Crosschecked: 2010-09-20

Cited: 2

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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.10 P.771-775

http://doi.org/10.1631/jzus.A1000125


Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting


Author(s):  Jing-yi Zhang, Feng Ye

Affiliation(s):  School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Corresponding email(s):   yf306@hit.edu.cn

Key Words:  Porous Si3N4 ceramics, Gelcasting, Microstructure, Mechanical properties


Jing-yi Zhang, Feng Ye. Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting[J]. Journal of Zhejiang University Science A, 2010, 11(10): 771-775.

@article{title="Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting",
author="Jing-yi Zhang, Feng Ye",
journal="Journal of Zhejiang University Science A",
volume="11",
number="10",
pages="771-775",
year="2010",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000125"
}

%0 Journal Article
%T Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting
%A Jing-yi Zhang
%A Feng Ye
%J Journal of Zhejiang University SCIENCE A
%V 11
%N 10
%P 771-775
%@ 1673-565X
%D 2010
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000125

TY - JOUR
T1 - Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting
A1 - Jing-yi Zhang
A1 - Feng Ye
J0 - Journal of Zhejiang University Science A
VL - 11
IS - 10
SP - 771
EP - 775
%@ 1673-565X
Y1 - 2010
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1000125


Abstract: 
Porous Si3N4 self-reinforce ceramics were prepared by gelcasting using agarose solutions. By changing the agarose content in the slurries, the porous silicon nitride ceramics with different porosities, α→β-Si3N4 phase transformation, and mechanical properties were obtained. When the agarose content changed from 0.2% to 0.8% (w/w, based on powder), the porosities increased from 10.3% to 21.4%, while the fracture strength decreased from 455 to 316 MPa and the fracture toughness decreased from 6.6 to 5.5 MPa·m1/2. Many fibrous β-Si3N4 grains grown from the internal wall of the round pores is the typical microstructure of the gelcasting porous silicon nitride ceramic. Both elongated β-Si3N4 grains and suitable interfacial bonding strength contributes to high fracture toughness by favoring crack deflection and bridging. The growth mechanisms of fibrous grains resulted from the synergy of solution-diffusion-reprecipitation and vapor-liquid-solid (VLS).

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Reference

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