Flexural strength and fracture behavior of ZrB2–SiC ultra-high temperature ceramic composites at 1800 °C |
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| Authors: | Ping Hu Zhi Wang |
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| Affiliation: | 1. Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore;2. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;1. College of Engineering, Peking University, Beijing 100871, PR China;2. Beijing Institute of Technology, Beijing 100081, PR China;3. Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China;1. Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad, 500058. India;2. National Aerospace Laboratories, Bangalore, 560017. India |
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| Abstract: | ZrB2–15 vol.%SiC and ZrB2–30 vol.%SiC composites with smaller starting particle sizes in which the particle sizes of ZrB2 and SiC are 2 μm and 0.5 μm, respectively, demonstrated marked plasticity and significant reduction in the flexural strength at 1800 °C. The flexural strengths of these two composites are 112 ± 12 MPa and 48 ± 10 MPa, respectively, and their corresponding strength retentions are 13% and 7%, respectively. Large ZrB2 grains were commonly observed in the samples containing 15 vol.%SiC, which are always the sites for the crack initiation. Cavities were found in the samples containing 30 vol.%SiC and the grain boundaries are the main sites for the crack and cavity nucleation. To improve ultra-high temperature strength, larger starting particle sizes (ZrB2 and SiC are 5 μm and 2 μm, respectively) were used for the preparation of ZrB2–15 vol.%SiC. This sample fractured in an elastic manner up to 1800 °C and showed a very high strength with a value of 217 ± 16 MPa. |
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