高温空气下C/SiC复合材料断裂韧性实时测试和微观结构表征分析

陈伟华 王丽燕 张晗翌 李冠姝 迟蓬涛 马静

陈伟华, 王丽燕, 张晗翌, 李冠姝, 迟蓬涛, 马静. 高温空气下C/SiC复合材料断裂韧性实时测试和微观结构表征分析[J]. 爆炸与冲击, 2021, 41(4): 043103. doi: 10.11883/bzycj-2020-0104
引用本文: 陈伟华, 王丽燕, 张晗翌, 李冠姝, 迟蓬涛, 马静. 高温空气下C/SiC复合材料断裂韧性实时测试和微观结构表征分析[J]. 爆炸与冲击, 2021, 41(4): 043103. doi: 10.11883/bzycj-2020-0104
CHEN Weihua, WANG Liyan, ZHANG Hanyi, LI Guanshu, CHI Pengtao, MA Jing. In-situ measurements of fracture toughness and microstructure characterization of C/SiC composites at elevated temperatures in air[J]. Explosion And Shock Waves, 2021, 41(4): 043103. doi: 10.11883/bzycj-2020-0104
Citation: CHEN Weihua, WANG Liyan, ZHANG Hanyi, LI Guanshu, CHI Pengtao, MA Jing. In-situ measurements of fracture toughness and microstructure characterization of C/SiC composites at elevated temperatures in air[J]. Explosion And Shock Waves, 2021, 41(4): 043103. doi: 10.11883/bzycj-2020-0104

高温空气下C/SiC复合材料断裂韧性实时测试和微观结构表征分析

doi: 10.11883/bzycj-2020-0104
详细信息
    通讯作者:

    陈伟华(1984- ),男,硕士,高级工程师,veihua1984@163.com

  • 中图分类号: O346.1;TB332

In-situ measurements of fracture toughness and microstructure characterization of C/SiC composites at elevated temperatures in air

  • 摘要: 为了研究高温空气下C/SiC复合材料断裂韧性和微观结构,采用单边切口梁三点弯曲法实时测试了C/SiC复合材料在高温空气下的断裂韧性,并采用电子扫描显微镜 (scanning electron microscope,SEM)和X 射线衍射分析仪 (X-ray diffraction, XRD)分析了复合材料在不同温度下的破坏断口和失效机制。研究结果表明随测试温度升高,C/SiC复合材料断裂韧性降低,材料的断裂形式由脆性断裂逐渐演变成塑性断裂。从室温升温到1 000 ℃测试温度条件下,C/SiC复合材料的断裂韧性由12.5 MPa·m1/2降低为10.96 MPa·m1/2,降幅仅为12%,C/SiC复合材料高温断裂韧性良好。不同温度下,材料呈现出不同形式的断裂形貌。常温下断口形貌主要可以看到纤维拔出的现象,随着温度的升高,该现象基本消失,断裂截面变得更平整,材料的强度主要取决于基体的强度。
  • 图  1  断裂韧性测试示意图

    Figure  1.  Diagram of fracture toughness test

    图  2  试验系统

    Figure  2.  Test system

    图  3  试验前后样品

    Figure  3.  Sample before and after the test

    图  4  常温下C/SiC复合材料的微观形貌

    Figure  4.  Microscopic morphologies of C/SiC composites at 25 °C

    图  5  不同温度下复合材料的XRD谱

    Figure  5.  XRD patterns of composites at different temperatures

    图  6  不同温度下复合材料的XRD局部放大图

    Figure  6.  XRD partial enlargement of composite materials at different temperatures

    图  7  C/SiC复合材料热重曲线

    Figure  7.  Thermogravimetric curve of C/SiC composites

    图  8  不同温度下材料断裂韧性的载荷-位移曲线

    Figure  8.  Load-displacement curves of fracture toughness of composites at different temperatures

    图  9  复合材料不同温度下的断裂韧性

    Figure  9.  Fracture toughness of composites at different temperatures

    图  10  断裂韧性测试后样品能谱图

    Figure  10.  Spectral energy spectra of composite fracture toughness test

    图  11  复合材料断裂韧性测试后样品的XRD谱图

    Figure  11.  XRD pattern of samples after fracture toughness test of composites

    图  12  常温下断裂测试断口微观形貌

    Figure  12.  Fracture microscopic topography at normal temperature

    图  13  高温下断裂韧性测试后的断口微观形貌

    Figure  13.  Fracture micromorphology after fracture toughness test at elevated temperatures

    表  1  25 °C时EDS能谱

    Table  1.   EDS energy at 25 °C

    元素质量百分比/%原子百分比/%
    C, K78.5686.47
    Si, K11.795.55
    O, K9.657.98
    总计100.00100.00
    下载: 导出CSV

    表  2  800 °C时EDS能谱

    Table  2.   EDS energy at 800 °C

    元素质量百分比/%原子百分比/%
    C, K18.8420.12
    Si, K46.6930.87
    O, K34.4840.02
    总计100.00100.00
    下载: 导出CSV

    表  3  1000 °C时EDS能谱

    Table  3.   EDS energy at 1000 °C

    元素质量百分比/%原子百分比/%
    Si, K33.8047.27
    O, K66.2052.73
    总计100.00100.00
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-04-08
  • 修回日期:  2020-08-14
  • 网络出版日期:  2021-03-05
  • 刊出日期:  2021-04-14

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