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Reticulated Porous Multiphase Ceramics with Improved Compressive Strength and Fracture Toughness

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Abstract

A multiphase reticulated porous ceramic (RPC) as Si3N4–Al2O3–SiO2 was fabricated by replication techniques. Proper volumes of additives and twice sinter- twice immerse process endow the RPC an excellent crack healing and submerging property. The compressive strength and fracture toughness improved owing to the crack bridging behavior. The existence of pores in struts in RPC blunt the crack tip and increased the external force needed to propagate the crack. The mechanisms play a beneficial role in enhancing the compressive strength and fracture strength. Si3N4 RPC with additives of 5%Al and 5% Al2O3 yielded the compressive strength of 9.8 MPa and fracture toughness of 0.3 MPa m1/2.

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Acknowledgments

This work was supported by the Natural Science Foundation of Shandong province (Y2006F03). Part of this research was done at the Institute of Materials Science and Technology of Jinan University. The authors are owing a debt of gratitude to the technical staff of these two institutions for their help.

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Authors and Affiliations

  1. School of Mechanical Engineering, Ji’nan University, Jinan, 250022, P.R. China

    Shou-ren Wang

  2. The Key Laboratory of Liquid Structure and Heredity of Materials of Shandong University, 250014, Ji’nan, P.R. China

    Shou-ren Wang

  3. School of Material Science, Ji’nan University, 250022, Ji’nan, P.R. China

    Hao-ran Geng, Lin-hai Hui & Ying-zi Wang

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  1. Shou-ren Wang
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  2. Hao-ran Geng
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  4. Ying-zi Wang
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Correspondence to Hao-ran Geng.

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Wang, Sr., Geng, Hr., Hui, Lh. et al. Reticulated Porous Multiphase Ceramics with Improved Compressive Strength and Fracture Toughness. J of Materi Eng and Perform 16, 113–118 (2007). https://doi.org/10.1007/s11665-006-9018-7

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  • DOI: https://doi.org/10.1007/s11665-006-9018-7

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