| Property of three-dimensional silica composites |
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| 作者姓名： | Guangyao Jia Zhimeng Guo |
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| 作者单位： | Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 摘 要： | Silica fibers-reinforced, fused silica composites were fabricated with repeated vacuum-assisted liquid-phase infiltration. The mechanical properties, thermal properties, and ablative properties of the samples were evaluated. The effect of the silica fiber content and treatment temperature on the flexural strength of the three-dimensional SiO2 （3-D SiO2） composites also was investigated. The SiO2 composites show good mechanical properties and excellent ablative performance. The flexural strength increases with an increase in silica fiber content, and decreases with an increase in treatment temperature. When the volume fraction of the silica fiber is 50vo1% and the treatment temperature is 700℃ the flexural strength of the composites reaches a maximum value of 78 MPa. By adding cyclohexanone surfactant, the infiltration property can be largely improved, resulting in the density of SiO2 composites increasing up to 1.65 g/cm^3. The fracture surfaces of the flexural specimens observed using SEM, show that the pseudoplasticity and the toughening mechanisms of the composites are caused by absorption of a lot of energy by interface debonding and fiber pulling out.
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| 关 键 词： | 硅陶瓷 硅纤维增强复合物 三维织物 力学性质 热性质 |
| 收稿时间： | 2006-04-11 |
Property of three-dimensional silica composites |
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| Guangyao Jia Zhimeng Guo.Property of three-dimensional silica composites[J].Journal of University of Science and Technology Beijing,2007,14(1):85-88. |
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| Authors: | Guangyao Jia Zhimeng Guo |
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| Affiliation: | 1. College of Education, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines;2. University of Macau, Macau;1. University of Alabama at Birmingham, Department of Pathology, Birmingham, 35294, USA;2. University of Alabama at Birmingham, Department of Surgery, Birmingham, 35294, USA;3. Eli Lilly and Company, New York, 10016, USA;4. Cancer and Vascular Biology Research Center, Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel |
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| Abstract: | Silica fibers-reinforced,fused silica composites were fabricated with repeated vacuum-assisted liquid-phase infiltration.The mechanical properties,thermal properties,and ablative properties of the samples were evaluated.The effect of the silica fiber content and treatment temperature on the flexural strength of the three-dimensional SiO2 (3-D SiO2) composites also was investigated.The SiO2composites show good mechanical properties and excellent ablative performance.The flexural strength increases with an increase in silica fiber content,and decreases with an increase in treatment temperature.When the volume fraction of the silica fiber is 50vo1% and the treatment temperature is 700 ℃,the flexural strength of the composites reaches a maximum value of 78 MPa.By adding cyclohexanone surfactant,the infiltration property can be largely improved,resulting in the density of SiO2 composites increasing up to 1.65g/cm3.The fracture surfaces of the flexural specimens observed using SEM,show that the pseudoplasticity and the toughening mechanisms of the composites are caused by absorption of a lot of energy by interface debonding and fiber pulling out. |
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| Keywords: | silica ceramics composites three-dimensional woven property |
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