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Research Article | Open Access

Preparation of porous Si3N4 ceramics via tailoring solid loading of Si3N4 slurry and Si3N4 poly-hollow microsphere content

Jia-Min WUa,b, Xiao-Yan ZHANGb, Jie XUb, Ke GANb, Jia-Lu LIb, Chen-Hui LIa( ), Jin-Long YANGb( ), Yu-Sheng SHIa
State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
State Key Laboratory of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

Porous Si3N4 ceramics were prepared by aqueous gelcasting using Si3N4 poly-hollow microspheres (PHMs) as pore-forming agent. The effects of solid loading of Si3N4 slurry and Si3N4 PHM content on the properties of porous Si3N4 ceramics were investigated. Only β-Si3N4 phase is observed in porous Si3N4 ceramics, and Si3N4 PHMs distribute uniformly both in Si3N4 green samples and porous Si3N4 ceramics. Results show that solid loading of Si3N4 slurry and Si3N4 PHM content could considerably influence the properties of porous Si3N4 ceramics. With the increase of solid loading of Si3N4 slurry (decrease of Si3N4 PHM content), the distributing state of Si3N4 PHMs changes from contacting with each other to just embedding in the matrix, thus their porosity decreases, while their shrinkage, flexural strength, and fracture toughness increase.

Keywords

porous Si3N4 ceramicsSi3N4 poly-hollow microspheres (PHMs)solid loadingaqueous gelcastingmechanical properties

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Journal of Advanced Ceramics
Volume 4 Issue 4,
December 2015
Pages 260-266
DOI: 10.1007/s40145-015-0158-9

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WU J-M, ZHANG X-Y, XU J, et al. Preparation of porous Si3N4 ceramics via tailoring solid loading of Si3N4 slurry and Si3N4 poly-hollow microsphere content. Journal of Advanced Ceramics, 2015, 4(4): 260-266. https://doi.org/10.1007/s40145-015-0158-9

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Received: 21 February 2015
Revised: 07 June 2015
Accepted: 12 June 2015
Published: 21 September 2015
© The author(s) 2015

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