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Porous Si3N4-based ceramics with uniform pore structure originated from single-shell hollow microspheres

  • Ceramics
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Abstract

Herein, the advantage of single-shell hollow microspheres on forming pores has been exploited to acquire porous ceramics with homogeneous microstructure, while the hollow microspheres also acted as reaction source. Dispersant reaction method has been applied to realize the perfect combination between microspheres and Si3N4 particles, which could be attributed to the repulsion between particles is weakened, particles agglomerate together and holding microspheres among them tightly. Owing to the normal distribution of hollow spheres and their single-shell structure, porous Si2N2O-Si3N4 ceramics with uniform pore distribution have been fabricated. The results show that the addition of silica hollow spheres contributes to the decrease in dielectric constant, since their porosity could be increased effectively and Si2N2O phase exhibiting low dielectric constant is generated. High-performance porous Si3N4 ceramics with porosity of 45.7% have been prepared through employing fly ash hollow microspheres, which possess flexural strength of 108.76 ± 6.25 MPa, fracture toughness of 1.78 ± 0.09 MPa m1/2 and dielectric constant of 3.53. This strategy is proved to be a convenient, eco-friendly and effective method to synthesize ideal candidates for radomes.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51572140 and 51702184) and China Postdoctoral Science Foundation (Grant Nos. 2018M630154, 2018M630149 and 2018M631492).

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Authors and Affiliations

  1. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Xiaoyan Zhang, Wenlong Huo, Yuju Lu, Ke Gan, Shu Yan, Jingjing Liu & Jinlong Yang

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  1. Xiaoyan Zhang
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  2. Wenlong Huo
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  3. Yuju Lu
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  4. Ke Gan
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  5. Shu Yan
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  6. Jingjing Liu
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  7. Jinlong Yang
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Correspondence to Wenlong Huo or Jinlong Yang.

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This contribution has been approved by all coauthors, it has not been published before, it is not under consideration for publication anywhere else, and there is no conflict of interest.

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Zhang, X., Huo, W., Lu, Y. et al. Porous Si3N4-based ceramics with uniform pore structure originated from single-shell hollow microspheres. J Mater Sci 54, 4484–4494 (2019). https://doi.org/10.1007/s10853-018-3118-2

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  • DOI: https://doi.org/10.1007/s10853-018-3118-2

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