High-temperature properties of Al 2 O 3 /SiO 2 composites
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ORIGINAL PAPER: FUNDAMENTALS OF SOL-GEL AND HYBRID MATERIALS P R O CE S S I N G
High-temperature properties of Al2O3/SiO2 composites chengxing Zhu1 Zhou Zheng ●
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Feng Cao1 Yang Xiang1 Zhihang Peng1 ●
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Received: 14 June 2020 / Accepted: 7 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
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. Graphical Abstract
Keywords
Al2O3/SiO2 composites Sol–gel process Microstructure High-temperature properties ●
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These authors contributed equally: Zhu Chengxin, Zheng Zhou * Zhou Zheng [email protected] 1
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China
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Journal of Sol-Gel Science and Technology
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.
1 Introduction High-performance aircraft always work under harsh environments with high pressure, high temperature, and even serious corrosion by various factors such as vapor and ceramic particles. Typically, the extreme environment requires that the structural materials of aircraft should possess excellent high-temperature properties [1, 2]. Aluminum and titanium alloys have been extensively applied in manufacturing the aerostructure parts, which can be ascribed to their high availability, low coefficient of thermal expansion, favorable strength-to-weight ratio, manufacturability, high toughness, and excellent weldability. However, with the development of aircraft, metallic materials can no longer meet the high-temperature resistance requirements of the advanced aircraft [3, 4]. Continuous fiber-reinf
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