Mechanical properties and damage of 2.5D braided SiC<sub>f</sub>/SiC ceramic matrix composites under different thermal shock conditions

DUAN Hongyu; WANG Hequan; ZHANG Jiaping; ZHENG Wei; CHEN Jing

doi:10.13801/j.cnki.fhclxb.20221011.002

Volume 40 Issue 7

Apr. 2023

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Acta Materiae Compositae Sinica > 2023 > 40(7): 4184-4194. > DOI: 10.13801/j.cnki.fhclxb.20221011.002

DUAN Hongyu, WANG Hequan, ZHANG Jiaping, et al. Mechanical properties and damage of 2.5D braided SiC_f/SiC ceramic matrix composites under different thermal shock conditions[J]. Acta Materiae Compositae Sinica, 2023, 40(7): 4184-4194. DOI: 10.13801/j.cnki.fhclxb.20221011.002

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Mechanical properties and damage of 2.5D braided SiC_f/SiC ceramic matrix composites under different thermal shock conditions

1.
School of Mechanical and Electrical Engineering, Shenyang University of Aeronautics and Astronautics, Shenyang 110136, China
2.
AECC Shenyang Liming Aero Engine CO., LTD., Shenyang 110043, China

Funds: Open Project of Liaoning Key Laboratory of Aero-engine Materials Tribology (LKLAMTF202204)

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Received Date: August 14, 2022
Revised Date: September 13, 2022
Accepted Date: September 29, 2022
Available Online: October 11, 2022

Abstract

Abstract

The effects of different thermal shock conditions (times) on the mechanical properties and damage of 2.5D braided SiC_f/SiC (f represents fiber) ceramic matrix composites (CMCs) were analyzed by uniaxial tensile and three-point bending experiments, combined with SEM and EDS. The results show that the tensile stress-strain curves of 2.5D braided SiC_f/SiC CMCs exhibit nonlinear changes at room temperature without thermal shock and under different thermal shock conditions at 1200℃. The tensile strength first decreases gradually, and then increases slightly. The tensile strength of the material decreases to 48.39% under 10 thermal shocks, and increases to 54.11% after 30 thermal shocks; The three-point bending displacement-load curves of the material without thermal shock at room temperature and under different thermal shock conditions at 1200℃ also show nonlinear changes, with the increase of the number of thermal shocks, the flexural strength decreases rapidly, the bending strength of the material rapidly drops to 26.06% under 10 thermal shocks, and decreases to 10.77% after 30 thermal shocks. From the macroscopic fracture analysis, it can be seen that the tensile and bending fractures of the material at room temperature without thermal shock show pseudo-brittle fracture characteristics, while the tensile and bending fractures show ductile fracture characteristics under thermal shock conditions. From the microscopic fracture, damage behaviors such as fiber pullout, fiber debonding, interface debonding, crack propagation and fiber fracture are observed, and with the increase of the number of thermal shocks, the interface bonding force is gradually weakened, and the above-mentioned damage behaviors increase significantly.
- 2.5D braid,
- SiC_f/SiC composite,
- ceramic matrix,
- thermal shock,
- mechanical properties,
- damage

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Mechanical properties and damage of 2.5D braided SiC_f/SiC ceramic matrix composites under different thermal shock conditions

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Mechanical properties and damage of 2.5D braided SiC_f/SiC ceramic matrix composites under different thermal shock conditions