Pore Morphology Design of Porous Si<sub>2</sub>N<sub>2</sub>O Ceramics via Silica Poly-Hollow Microspheres

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Pore Morphology Design of Porous Si2N2O Ceramics via Silica Poly-Hollow Microspheres
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Affiliation:State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,,School of Materials Science and Engineering,North University of China,State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University
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In this research, as pore-forming agents, silica poly-hollow microspheres were added into Si₃N₄ slurries, and Si₂N₂O phase was generated by the liquid phase sintering reaction between SiO₂ and Si₃N₄. Moreover, the space occupied by the silica poly-hollow microspheres would become the pores after the sintering process, and porous Si₂N₂O ceramics were fabricated. The morphology and mechanical properties of porous Si₂N₂O ceramics could be well regulated by adjusting the solid loading of Si₃N₄ slurry. The results show that with the increase of Si₃N₄ slurry solid loading, the content of Si₂N₂O phase increases and their porous structure has great changes. Besides, their open porosity decreases to 51.7% and their flexural strength increases to 26.74 MPa.

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[Xiaoyan Zhang, Wenlong Huo, Tian Lan, Jie Cui, Ke Gan, Shu Yan, Jinlong Yang. Pore Morphology Design of Porous Si₂N₂O Ceramics via Silica Poly-Hollow Microspheres[J]. Rare Metal Materials and Engineering,2018,47(S1):41~44.]
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Received:May 23,2017
Revised:May 23,2017
Adopted:January 29,2018
Online: October 22,2018
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