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High-temperature properties of Al2O3/SiO2 composites

  • Original Paper: Fundamentals of sol-gel and hybrid materials processing
  • Published:
Journal of Sol-Gel Science and Technology Aims and scope Submit manuscript

Abstract

In this study, Al2O3 fiber-reinforced silica matrix composites were fabricated by traditional sol–gel process. To study the mechanical properties of Al2O3/SiO2 composites under high-temperature environment and after high-temperature treatment, the tensile strength and fracture behavior of it under high temperatures were investigated, and their flexural strength after heat treatment at various temperatures was also examined. Our results indicated that the tensile strength of original composites was 85.6 MPa, and that at 1000, 1100, 1200, and 1300 °C was 77.5, 62.5, 52.5, and 40.2 MPa, respectively. The flexural strength of original composites was 78.1 MPa, and that after heat treatment at 1100, 1300, and 1500 °C was 45.5, 40.5, and 27.9 MPa, respectively. The composites exhibited ductile fracture after tensile tests, and still maintain high tensile strength of about 50% even at 1300 °C. What is more, the composites exhibited brittle fracture after heat treatment, with no formation of new phase after heat treatment. In conclusion, our findings suggested that Al2O3/SiO2 composites display outstanding high-temperature properties.

Highlights

  • The continuous alumina fibers reinforced SiO2 matrix (Al2O3/SiO2) composites were prepared.

  • The tensile strength and fracture behavior of Al2O3/SiO2 composites under high temperatures were investigated in detail.

  • The flexural strength after heat treatment at various temperatures of Al2O3/SiO2 composites was also examined.

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Acknowledgements

The authors are grateful to Hunan Natural Science Foundation (2020JJ5660) and Key Laboratory Fund (6142907180402) for financial support. The authors are also grateful to Aid Program for Innovative Group of National University of Defense Technology and Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.

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  1. These authors contributed equally: Zhu Chengxin, Zheng Zhou

Authors and Affiliations

  1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, 410073, China

    chengxing Zhu, Zhou Zheng, Feng Cao, Yang Xiang & Zhihang Peng

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  1. chengxing Zhu
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  2. Zhou Zheng
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  3. Feng Cao
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  4. Yang Xiang
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Correspondence to Zhou Zheng.

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Zhu, c., Zheng, Z., Cao, F. et al. High-temperature properties of Al2O3/SiO2 composites. J Sol-Gel Sci Technol 97, 63–70 (2021). https://doi.org/10.1007/s10971-020-05413-w

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  • DOI: https://doi.org/10.1007/s10971-020-05413-w

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