Preparation and properties of an oxide fiber‐reinforced silica matrix composite |
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| Authors: | Yingqian Gao Lifu Zhang Jian Chen Xiangwei Wang Haifeng Cheng |
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| Affiliation: | 1. Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China;2. Equipment Academy of The Rocket Force, Beijing, China;3. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, China |
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| Abstract: | Oxide (Nextel? 440) fiber‐reinforced silica composites, with the density and porosity of 1.97 g/cm3 and 21.8%, were prepared through sol‐gel. Their average flexure strength, elastic modulus, shear strength, and fracture toughness at room temperature were 119.7 MPa, 25.6 GPa, 10.8 MPa, and 4.0 MPa·m1/2, respectively. The composites showed typical toughened fracture behavior, and distinct pullout fibers were observed at the fracture surface. Their mechanical properties were performant up to 1000°C, with the maximum flexural strength of 132.2 MPa at 900°C. Moreover, the composites showed good thermal stability, even after thermal aging and thermal shock at elevated temperatures. |
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| Keywords: | ceramic matrix composites mechanical properties oxides sol‐gel |
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