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

CHEN Weihua; WANG Liyan; ZHANG Hanyi; LI Guanshu; CHI Pengtao; MA Jing

doi:10.11883/bzycj-2020-0104

Volume 41 Issue 4

Apr. 2021

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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

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

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

doi: 10.11883/bzycj-2020-0104

1.
Science and Technology on Space Physics Laboratory, China Academy of Launch Vehicle Technology, Beijing 100076, China
2.
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China
3.
Capital Aerospace Machinery Limited Company, Beijing 100076, China

Received Date: 2020-04-08
Rev Recd Date: 2020-08-14

Available Online: 2021-03-05

Publish Date: 2021-04-14

Abstract

Abstract

To study the fracture toughness and microstructure of C/SiC composites at elevated temperature in air, the fracture toughness of C/SiC composites at elevated temperature in air was in-situ measured by SENB (single edge notch beam) under TPB (three point bending) method. The fracture and failure mechanism of the composites at different temperatures were analyzed by SEM (scanning electron microscope) and XRD (X-ray diffraction). The results show that with the increase of temperature, the fracture toughness of C/SiC composites decreases, and the fracture mode gradually changes from brittle fracture to plastic fracture. The fracture toughness of C/SiC composites decreases from 12.504 MPa·m^1/2 to 10.958 MPa·m^1/2 with a reduction of 12% from room temperature to 1 000 °C. The material exhibits a good high-temperature fracture toughness. Under different temperatures, the material exhibits different modes of fracture morphology. At the normal temperature, the fracture morphology can mainly show the phenomenon of fiber pull-out. With the increase of temperature, the phenomenon basically disappears, the fracture cross section becomes flatter, and the strength of the material mainly depends on the strength of the substrate.
- C/SiC composites,
- fracture toughness,
- microstructure,
- in-situ measurements,
- elevated temperature in air

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References(20)

References

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