Flexural properties of carbon-carbon composites at temperatures up to 2600 °C
Flexural properties of carbon-carbon composites at temperatures up to 2600 °C
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DOI：
10.1088/2053-1591/ab23c9
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发表时间：
2019-06
影响因子：
2.3
通讯作者：
Tianbao Cheng;Rubing Zhang;Y. Pei;R. He;D. Fang;Yazheng Yang
中科院分区：
文献类型：
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作者：
Tianbao Cheng;Rubing Zhang;Y. Pei;R. He;D. Fang;Yazheng Yang
首次研究了碳-碳复合材料（C/Cs）在2600℃高温下的弯曲性能。结果表明：当温度达到2000℃时，材料的抗弯强度先升高，然后在2300℃时略有下降，在2600℃时急剧下降；抗弯强度的温度依赖性与纤维-基体界面的结合强度（在2000℃前增加，然后随温度升高而降低）和碳的断裂强度（在2300℃前增加，然后随温度升高而显著降低）有关。此外，研究表明，杨氏模量与抗弯强度具有相似的温度依赖性，但在2000℃以上下降更快。并对不同温度下的变形行为和破坏机制进行了研究。这些结果对热工结构中C/C的设计、应用和可靠性评价具有一定的指导意义。
The flexural properties of carbon-carbon composites (C/Cs) are studied up to 2600 °C for the first time. The results show that the bending strength firstly increases with temperature up to 2000 °C, then decreases moderately to 2300 °C, and finally decreases rapidly to 2600 °C. The temperature dependence of bending strength is related to the bonding strength of the fiber-matrix interface (which increases up to 2000 °C and then decreases with increasing temperature) and the fracture strength of carbon (which increases up to 2300 °C followed by significant reduction as temperature increases). Besides, the study shows that the Young’s modulus shows similar temperature dependence with the bending strength, but decreases more rapidly above 2000 °C. Moreover, the deformation behaviors and failure mechanisms at different temperatures are studied. These results are useful for the design, application, and evaluation of the reliability of C/Cs in the thermal structure engineering.