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

Jia-Min WU; Xiao-Yan ZHANG; Jie XU; Ke GAN; Jia-Lu LI; Chen-Hui LI; Jin-Long YANG; Yu-Sheng SHI

doi:10.1007/s40145-015-0158-9

Journal of Advanced Ceramics 2015, 4(4): 260-266 https://doi.org/10.1007/s40145-015-0158-9

Research Article |

Open Access | Issue | Published: 21 September 2015

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

Show Author's Information Hide Author's Information Jia-Min WU^{^a^,^b}, Xiao-Yan ZHANG^{^b}, Jie XU^{^b}, Ke GAN^{^b}, Jia-Lu LI^{^b}, Chen-Hui LI^{^a}(

), Jin-Long YANG^{^b}(

), Yu-Sheng SHI^{^a}

a 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

b State Key Laboratory of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords:

porous Si₃N₄ ceramics, Si₃N₄ poly-hollow microspheres (PHMs), solid loading, aqueous gelcasting, mechanical properties

Cite this article:

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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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.

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

Show Author's information Hide Author's Information Jia-Min WU^{^a^,^b}, Xiao-Yan ZHANG^{^b}, Jie XU^{^b}, Ke GAN^{^b}, Jia-Lu LI^{^b}, Chen-Hui LI^{^a}(

), Jin-Long YANG^{^b}(

), Yu-Sheng SHI^{^a}

a 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

b State Key Laboratory of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract

Keywords: porous Si₃N₄ ceramics, Si₃N₄ poly-hollow microspheres (PHMs), solid loading, aqueous gelcasting, mechanical properties

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Publication history

Received: 21 February 2015

Revised: 07 June 2015

Accepted: 12 June 2015

Published: 21 September 2015

Issue date: April 2015

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Acknowledgements

Our research work presented in this paper was supported by China Postdoctoral Science Foundation (Nos. 2013M530618 and 2015M572136), National Natural Science Foundation of China (Nos. 51172120 and 51372093), Fundamental Research Funds for the Central Universities (HUST: 2015J07), Open Fund of State Key Laboratory of New Ceramic and Fine Processing (Tsinghua University) (No. KF201518) and the 02 Important and Special Project for the State Science and Technology (No. 2013ZX2104-001-002).

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