Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting
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...
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Published in | Journal of Zhejiang University. A. Science Vol. 11; no. 10; pp. 771 - 775 |
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Format | Journal Article |
Language | English |
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Hangzhou
Zhejiang University Press
01.10.2010
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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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AbstractList | 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). Porous Si 3 N 4 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-Si 3 N 4 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·m 1/2 . Many fibrous β-Si 3 N 4 grains grown from the internal wall of the round pores is the typical microstructure of the gelcasting porous silicon nitride ceramic. Both elongated β-Si 3 N 4 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). |
Author | Jing-yi ZHANG Feng YE |
AuthorAffiliation | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
Author_xml | – sequence: 1 givenname: Jing-yi surname: Zhang fullname: Zhang, Jing-yi organization: School of Materials Science and Engineering, Harbin Institute of Technology – sequence: 2 givenname: Feng surname: Ye fullname: Ye, Feng email: yf306@hit.edu.cn organization: School of Materials Science and Engineering, Harbin Institute of Technology |
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CitedBy_id | crossref_primary_10_1016_j_jallcom_2021_162945 crossref_primary_10_1016_j_matpr_2017_07_205 crossref_primary_10_3390_nano11020285 crossref_primary_10_1016_j_ceramint_2018_01_165 crossref_primary_10_1016_j_ceramint_2019_02_043 crossref_primary_10_1016_j_matpr_2017_02_035 |
Cites_doi | 10.1016/S0261-3069(99)00075-8 10.1111/j.1151-2916.1979.tb19096.x 10.1111/j.1151-2916.1997.tb03179.x 10.1111/j.1551-2916.2006.01037.x 10.1016/j.msea.2008.09.066 10.1016/S0955-2219(03)00212-7 10.1111/j.1151-2916.1995.tb08667.x 10.1016/S0167-577X(02)01388-5 10.1023/A:1018554217839 10.1016/S0272-8842(97)00042-4 10.1016/j.msea.2007.09.104 10.1016/j.msea.2009.09.064 10.1557/JMR.2001.0262 10.1016/S0955-2219(02)00175-9 |
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References | Quander, Bandyopadhyay, Aswath (CR10) 1997; 32 Shqau, Mottern, Yu, Verweij (CR11) 2006; 89 Díaz, Hampshire (CR2) 2004; 24 Ohji (CR8) 2008; 498 Bocanegra-Bernal, Matovic (CR1) 2010; 527 Li, Yin, Zhang, Chen, Qi (CR7) 2009; 500 Yang, Zhang, Ohji (CR13) 2001; 16 Gilissen, Erauw, Smolders, Vanswijgenhoven, Luyten (CR3) 2000; 21 Lange (CR6) 1979; 62 Soltmann, Böttcher, Koch, Grathwohl (CR12) 2003; 57 Yang, Deng, Ohji (CR14) 2003; 23 Kawai, Yamakawa (CR4) 1997; 80 Kawai, Yamakawa (CR5) 1998; 24 Peterson, Tien (CR9) 1995; 78 C. Kawai (2831_CR5) 1998; 24 X.M. Li (2831_CR7) 2009; 500 A. Díaz (2831_CR2) 2004; 24 R. Gilissen (2831_CR3) 2000; 21 T. Ohji (2831_CR8) 2008; 498 M.H. Bocanegra-Bernal (2831_CR1) 2010; 527 F.F. Lange (2831_CR6) 1979; 62 U. Soltmann (2831_CR12) 2003; 57 S.W. Quander (2831_CR10) 1997; 32 I.M. Peterson (2831_CR9) 1995; 78 C. Kawai (2831_CR4) 1997; 80 J.F. Yang (2831_CR14) 2003; 23 K. Shqau (2831_CR11) 2006; 89 J.F. Yang (2831_CR13) 2001; 16 |
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Snippet | Porous Si3N4 self-reinforce ceramics were prepared by gelcasting using agarose solutions. By changing the agarose content in the slurries, the porous silicon... Porous Si 3 N 4 self-reinforce ceramics were prepared by gelcasting using agarose solutions. By changing the agarose content in the slurries, the porous... |
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SubjectTerms | Civil Engineering Classical and Continuum Physics Engineering Industrial Chemistry/Chemical Engineering Mechanical Engineering 凝胶注模成型 力学性能 多孔硅 微观结构 氮化物陶瓷 氮化硅陶瓷 琼脂糖 |
Title | Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting |
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