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Mechanical properties and in situ fracture behavior of SiO2f/phosphate geopolymer composites

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Abstract

Geopolymers, such as phosphate-based geopolymer, are promising materials that have drawn extensive attentions as wave-transparent candidates with low dielectric loss factor. In this paper, multilayer SiO2 fibers are introduced into phosphate-based geopolymer matrix to prepare composites. Crack generation and fracture behaviors during the three-point bending tests in as-prepared SiO2f/phosphate geopolymer composites are clarified by in situ observation. Before high-temperature treatment, composite with 17 vol% fiber content exhibits the best mechanical properties. A decreasing mechanical strength is observed after being treated at higher temperature, which is attributed to the stronger interface binging between fibers and phosphate-based geopolymer matrix. Most importantly, the presence of SiO2 fibers can strengthen mechanical properties of phosphate-based geopolymer matrix but shows negligible impact on its dielectric properties, achieving dielectric loss factor as low as 3.53 × 10−3 after being treated at 700 °C.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51872063, 51502052, 51832002 and 51621091).

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Authors and Affiliations

  1. Aerospace Institute of Advanced Materials and Processing Technology, Beijing, 100074, China

    Chang-Qing Yu, You-Ran Yu & Ying-Min Zhao

  2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Pei-Gang He, Chang-Shou Xu, Shuai Fu & Zhi-Hua Yang

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  1. Chang-Qing Yu
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  2. You-Ran Yu
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  3. Ying-Min Zhao
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  4. Pei-Gang He
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  7. Zhi-Hua Yang
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Correspondence to Pei-Gang He.

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Yu, CQ., Yu, YR., Zhao, YM. et al. Mechanical properties and in situ fracture behavior of SiO2f/phosphate geopolymer composites. Rare Met. 39, 562–569 (2020). https://doi.org/10.1007/s12598-019-01316-0

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