| 引用本文: | 谢征芳,肖加余,陈朝辉,等.用溶胶-凝胶法制备碳纤维三维编织物增强氧化铝基复合材料的研究.[J].国防科技大学学报,1998,20(5):14-18.[点击复制] |
| Xie Zhengfang,Xiao Jiayu,Chen Zhaohui,et al.Processing and Mechanical Properties of 3-Dimensional Braided Carbon Fiber Preform Reinforced Alumina Matrix Composites Prepared by Sol-gel Method[J].Journal of National University of Defense Technology,1998,20(5):14-18[点击复制] |
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| 用溶胶-凝胶法制备碳纤维三维编织物增强氧化铝基复合材料的研究 |
| 谢征芳, 肖加余, 陈朝辉, 王兴业, 郑文伟, 江大志 |
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(国防科技大学 材料工程与应用化学系 湖南 长沙 410073)
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| 摘要: |
| 本文研究了溶胶-凝胶(Sol-gel) 法制备碳纤维三维编织物增强氧化铝(Al2O3) 基复合材料的成型工艺及其力学性能, 研究了两种主要起始物Al(NO3)3、AlCl3配制的氧化铝溶胶对复合材料成型工艺和力学性能的影响。分别以Al(NO3)3和AlCl3为起始物, 制备得到Ⅰ# 、II # 复合材料。研究表明, 以Al(NO3)3为起始物配制的溶胶粘度较小, 利于材料的致密化。经过溶胶浸渍、凝胶、裂解13个周期后,Ⅰ# 材料的密度和室温三点弯曲强度分别为1.86g/cm3和145.2MPa, 而II # 材料的密度和室温三点弯曲强度分别为1.63g/cm3和104.1MPa, 材料均呈典型的韧性断裂模式。用扫描电子显微镜(SEM) 观察试样的断口形貌, 发现断口表面有大量的纤维拔出, 纤维表现了较好的增韧效果。 |
| 关键词: 陶瓷基复合材料, 碳纤维三维编织物, Al2O3 基体, sol-gel 法 |
| DOI： |
| 投稿日期：1997-12-23 |
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| Processing and Mechanical Properties of 3-Dimensional Braided Carbon Fiber Preform Reinforced Alumina Matrix Composites Prepared by Sol-gel Method |
| Xie Zhengfang, Xiao Jiayu, Chen Zhaohui, Wang Xingye, Zheng Wenwei, Jiang Dazhi |
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(Department of Material Engineering & Applied Chemistry, NUDT, Changsha, 410073)
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| Abstract: |
| The processing and mechanical properties of 3-dimensional brainded carbon fiber preform reinforced alumina (Al2O3) matrix composites prepared by sol-gel method were investigated. The influences of different sols prepared from Al(NO3)3 and AlCl3 hydrolysis, respectively, on the processing and mechanical properties of composites were also studied. Composites I# and II# were prepared from the sols with Al(NO3)3 and AlCl3 as starting material, respectively. The viscosity of the sol Prepared from Al(NO3)3 hydrolysis was lower than that from AlCl3 hydrolysis, so the densification rate of composite I# was faster than that of composite II#. After 13 times of sol infiltration-gelation-pyrolysis, the density and the flexural strength of as-fabricated composite I# reached 1.86g/cm3 and 145.2MPa, respectively, while those of composite II# reached 1.63g/cm3 and 104.1MPa, respectively. SEM observation of all the specimen fracture surfaces showed a large amount of fiber pull-out. It illustrated that the carbon fiber played a role of toughening Al2O3. |
| Keywords: ceramic matrix composites (CMCs), 3-dimensional braided carbon fiber preform, Al2O3 matrix, sol-gel method |
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