Ultra-high-temperature tensile properties and fracture behavior of ZrB2-based ceramics in air above 1500 °C |
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| Affiliation: | 1. Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. LTCS, College of Engineering, Peking University, Beijing 100871, China;1. Politecnico di Torino, Department of Applied Science and Technology, C.so Duca degli Abruzzi 24, 10129 Torino, Italy;2. Università di Genova, Department of Physics, Via Dodecaneso 33, 16146 Genova, Italy;1. Frantsevich Institute for Problems in Materials Science, 3 Krzhizhanovsky St., 03142 Kyiv, Ukraine;2. CNR-ISTEC, National Research Council of Italy - Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018 Faenza, Italy;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. College of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China;3. School of Civil and Mechanical Engineering, Curtin University, Perth, WA 6845, Australia;4. Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | Nearly fully dense ZrB2–SiC–graphite composites were fabricated from commercially available powder at 1900 °C by hot pressing. The tensile strength of ZrB2-based ceramics was measured in air up to 1750 °C, which is the first reported tensile strength measurement in air above 1500 °C. A mechanical testing apparatus capable of testing material in ultra-high temperature under air atmosphere was built, evaluated, and used. Tensile strength was measured as a function of temperature up to 1750 °C in air. The respective average values of the tensile strength measured at 1550 °C, 1650 °C, and 1750 °C are 58.4, 44.8, and 21.8 MPa, which are 49.4%, 37.9%, and 18.4% of their room-temperature strength (118.2 MPa), respectively. Moreover, the tensile fracture behaviors and mechanism of ZrB2-based ceramics at different testing temperatures were discussed based on microstructure characterization. |
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| Keywords: | A Zirconium diboride ceramic matrix C Sintering E Mechanical property F Microstructure |
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