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Preparation and properties of pressureless-sintered porous Si3N4

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Abstract

Wave-transparent materials used at high temperature environment generated by high supersonic and hypersonic speeds must possess excellent mechanical property. In this paper, porous Si3N4 ceramics with high strength were fabricated by low molding pressure (10 MPa) and pressureless sintering process, without any other pore forming agents. The sintering behavior and the effect of porosity on the mechanical strength and dielectric properties were investigated. The flexural strength of porous Si3N4 ceramics was up to 57–176 MPa with porosity of 45–60%, dielectric constant of 2.35–3.39, and dielectric loss of 1.6–3.5 × 10−3 in the frequency range of 8–18 GHz, at room temperature. With the increase of porosity, the flexural strength, dielectric constant, and dielectric loss all decreased.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (90816018), the project of National Laboratory of Advanced Functional Composite Materials (9140C5602040805), and Xi’an Science and Technology Program (CXY08006(1)).

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, 28 Xian Ning Road, Xi’an, 710049, People’s Republic of China

    Hongjie Wang & Juanli Yu

  2. National Key Laboratory of Advanced Functional Composite Materials, Beijing, 100076, China

    Jian Zhang & Dahai Zhang

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  1. Hongjie Wang
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  2. Juanli Yu
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  3. Jian Zhang
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  4. Dahai Zhang
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Correspondence to Hongjie Wang.

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Wang, H., Yu, J., Zhang, J. et al. Preparation and properties of pressureless-sintered porous Si3N4 . J Mater Sci 45, 3671–3676 (2010). https://doi.org/10.1007/s10853-010-4412-9

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  • DOI: https://doi.org/10.1007/s10853-010-4412-9

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