Journal
COMPOSITES PART B-ENGINEERING
Volume 106, Issue -, Pages 59-65Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2016.06.078
Keywords
Carbon-carbon composites; Microstructure; Mechanical properties; Heat treatment
Funding
- National Natural Science Foundation of China [51221061, 51572223]
- Research Fund of State Key Laboratory of Solidification Processing (NWPU), China [85-TZ-2013]
- 111 Project [B08040]
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In order to understand thermal fatigue behavior of carbon/carbon (C/C) composites, they were subjected to thermal cycles between 1373 K and room temperature for different times. Their microstructure, mechanical strength and internal friction after thermal cycles were studied. The results show that the flexural strength of C/C composites increased from 69 MPa to 89 MPa after 10 thermal cycles between 1373 K and room temperature, and internal friction increased significantly with the increase of thermal cycles. The improvement of the internal friction and the strength were attributed to the increase of the residual thermal stresses at the interfaces. Further increase in the thermal cycles will reduce the interfacial strength between carbon matrix and fibers due to matrix cracking and the decrease of interfacial bonding strength. (C) 2016 Elsevier Ltd. All rights reserved.
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