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Microstructure and mechanical performance of acicular mullite-reinforced porous self-bonded ceramics

  • Ceramics
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Abstract

Acicular mullite-reinforced porous self-bonded ceramics were fabricated using mullite powders as principal raw materials, alumina and silicon dioxide powders as starting synthetic source of self-bonded mullite phase, and 2 wt% AlF3·3H2O as an accelerant. The influences of self-bonded mullite weight percent on the phase composition, microstructures, mechanical performance and thermal conductivities of acicular mullite-reinforced porous self-bonded samples were investigated. As self-bonded mullite weight percent varied between 0 and 50 wt%, linear shrinkage, bulk density and thermal conductivities of fired porous self-bonded mullite samples reduced, whereas their porosity increased. Addition of appropriate amounts of self-bonded mullite decreased the mean pore size and window size in porous sample, and enhanced the mechanical strength. When self-bonded mullite weight percent reached 50 wt%, the compressive and flexural strength of acicular mullite-reinforced porous self-bonded ceramics was, respectively, kept as 19.9 MPa and 8.8 MPa, with a porosity of 74.7%, a diminutive mean pore size of 159 μm and a window size of 44 μm. Moreover, the linear shrinkage and thermal conductivity of the materials at 50 °C were only 7.4% and 0.23 W m K−1, respectively.

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Acknowledgements

This research work in paper was supported by the Natural Science Foundation of Anhui Province (1908085ME117), Natural Science Foundation of Anhui Provincial Education Department (KJ2018A0052), the University Synergy Innovation Program of Anhui Province (GXXT-2019-015), the Opening Project of the Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (JKF 18-04), National Natural Science Foundation of China (51872210, U1860102 and 51972002), and the Open Foundation of the State Key Laboratory of Refractories and Metallurgy (G201801).

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Authors and Affiliations

  1. Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, School of Materials Science and Engineering, 243002, Ma’anshan, China

    Xiangong Deng, Jiaqiang Yin, Wanchun Zhang, Chaoheng Deng, Tingting Wei, Hailiang Deng, Chuangang Fan & Bing Cui

  2. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, 243002, Ma’anshan, China

    Xiangong Deng & Songlin Ran

  3. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Haijun Zhang

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  1. Xiangong Deng
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  2. Jiaqiang Yin
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Correspondence to Chuangang Fan or Songlin Ran.

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Deng, X., Yin, J., Zhang, W. et al. Microstructure and mechanical performance of acicular mullite-reinforced porous self-bonded ceramics. J Mater Sci 55, 9322–9329 (2020). https://doi.org/10.1007/s10853-020-04558-x

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