| 引用本文: | 陈伟华,王丽燕,张晗翌,等.高温空气下C/SiC复合材料力学性能测试.[J].国防科技大学学报,2021,43(6):26-32, 48.[点击复制] |
| CHEN Weihua,WANG Liyan,ZHANG Hanyi,et al.Test of mechanical properties of C/SiC composites at elevated temperature air[J].Journal of National University of Defense Technology,2021,43(6):26-32, 48[点击复制] |
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| 高温空气下C/SiC复合材料力学性能测试 |
| 陈伟华1,王丽燕1,张晗翌1,季妮芝1,李冠姝2,马静3 |
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(1. 中国运载火箭技术研究院 空间物理重点实验室, 北京 100076;2. 哈尔滨工业大学 化工与化学学院, 黑龙江 哈尔滨 150001;3. 首都航天机械有限公司, 北京 100076)
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| 摘要: |
| 测试了C/SiC复合材料在高温空气下的压缩、弯曲和拉伸性能,利用扫描电子显微镜分析复合材料在室温与高温条件下的断口微观形貌。结果表明:从室温升温到1 000 ℃测试温度时,C/SiC复合材料的压缩强度由247 MPa降低至78 MPa,性能降低68%；弯曲强度由480 MPa降低至277 MPa,性能降低42%；拉伸强度由247 MPa降低至152 MPa,性能降低38%。高温氧化导致界面退化,损伤材料基体与碳纤维结构,加剧了纤维断裂程度,改变了纤维与基体的结合状态,纤维增韧机制逐渐消失,导致复合材料性能下降。 |
| 关键词: C/SiC复合材料 高温空气 高温力学性能 微观结构 |
| DOI：10.11887/j.cn.202106004 |
| 投稿日期：2020-04-20 |
| 基金项目:国防科技重点实验室基金资助项目(61422110204) |
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| Test of mechanical properties of C/SiC composites at elevated temperature air |
| CHEN Weihua1, WANG Liyan1, ZHANG Hanyi1, JI Nizhi1, LI Guanshu2, MA Jing3 |
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(1. Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing 100076, China;2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Capital Aerospace Machinery Limited Company, Beijing 100076, China)
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| Abstract: |
| The compression, bending and tensile properties of C/SiC composites at elevated temperature air were tested. The microstructures of fractures at room temperature and elevated temperature were analyzed by scanning electron microscope, respectively. Results show that, when the test temperature varies from room temperature to 1 000 ℃, the compressive strength, flexural strength and tensile strength of C/SiC composites decreases from 247 MPa to 78 MPa, 480 MPa to 277 MPa and 247 MPa to 152 MPa, respectively. The performance of these three mechanical parameters of C/SiC composites is reduced by 68%, 42% and 38%, respectively. High temperature oxidation leads to interface degradation and carbon fiber structural damage, which aggravates the degree of fiber breakage, and changes the state of fiber-matrix bonding. As a result, the fiber toughening mechanism gradually disappears, and composite properties decays. |
| Keywords: C/SiC composites elevated temperature air high temperature mechanical properties microstructure |
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