热处理对薄层化C/C复合材料微观结构和力热性能的影响

李海梅; 刘在栋; 乔志炜; 叶志勇; 刘俊文; 李志强; 魏琰斌; 余文皓; 龙泉源; 卢丽; 文青波; 王雅雷; 熊翔

doi:10.19976/j.cnki.43-1448/TF.2025042

粉末冶金材料科学与工程 >

2025 , Vol. 30 >Issue 5: 433 - 445

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2025042

工艺技术

热处理对薄层化C/C复合材料微观结构和力热性能的影响

李海梅 ,
刘在栋 ,
乔志炜 ,
叶志勇 ,
刘俊文 ,
李志强 ,
魏琰斌 ,
余文皓 ,
龙泉源 ,
卢丽 ,
文青波 ,
王雅雷 ,
熊翔

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1.中南大学粉末冶金全国重点实验室,长沙 410083;
2.南京玻璃纤维研究设计院有限公司,南京 210012

收稿日期: 2025-04-29

修回日期: 2025-09-15

网络出版日期: 2025-11-27

基金资助

国家重点研发计划资助项目(2022YFB3706103)

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Effects of heat treatment on microstructure and thermo-mechanical properties of thin-layered C/C composites

LI Haimei ,
LIU Zaidong ,
QIAO Zhiwei ,
YE Zhiyong ,
LIU Junwen ,
LI Zhiqiang ,
WEI Yanbin ,
YU Wenhao ,
LONG Quanyuan ,
LU Li ,
WEN Qingbo ,
WANG Yalei ,
XIONG Xiang

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1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Nanjing Fiberglass Research & Design Institute Co., Ltd, Nanjing 210012, China

Received date: 2025-04-29

Revised date: 2025-09-15

Online published: 2025-11-27

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摘要

本文采用化学气相沉积法制备具有薄层化特征的展宽缝合结构C/C复合材料,系统研究了高温热处理对C/C复合材料微观结构、力学性能及热膨胀性能的影响。结果表明：高温热处理导致碳纤维/热解碳基体界面剪切强度下降和材料整体石墨化度提升。热处理后,C/C复合材料的抗拉强度由112.3 MPa提升至195.3 MPa,主要得益于碳纤维/热解碳基体界面剪切强度的降低;而C/C复合材料的抗压强度则由300.0 MPa降低至121.6 MPa,主要归因于复合材料层间结合强度的下降,层间解离则是其主要的破坏模式。此外,热处理后C/C复合材料石墨化度的提升是导致其模量增加和热膨胀系数降低的主要原因。

关键词： 蜂窝夹层结构; 薄层化C/C复合材料; 力学性能; 热膨胀性能; 高温热处理

本文引用格式

李海梅 , 刘在栋 , 乔志炜 , 叶志勇 , 刘俊文 , 李志强 , 魏琰斌 , 余文皓 , 龙泉源 , 卢丽 , 文青波 , 王雅雷 , 熊翔 . 热处理对薄层化C/C复合材料微观结构和力热性能的影响[J]. 粉末冶金材料科学与工程, 2025 , 30(5) : 433 -445 . DOI: 10.19976/j.cnki.43-1448/TF.2025042

Abstract

In this study, thin-layered C/C composites with a spread-stitching architecture were prepared by chemical vapor deposition. The effects of high-temperature heat treatment on the microstructure, mechanical and thermal expansion properties of the C/C composites were systematically investigated. The results indicate that high-temperature heat treatment leads to a reduction of shear strength at interface between the carbon fiber and pyrolytic carbon, while simultaneously enhancing the degree of graphitization in both materials. After high-temperature heat treatment, the tensile strength of the C/C composites increases from 112.3 MPa to 195.3 MPa, which is primarily attributed to the weakened interfacial shear strength. In contrast, the compressive strength decreases from 300.0 MPa to 121.6 MPa, mainly due to the degradation of interlaminar bonding strength, with interlayer delamination identified as the dominant failure mode. Furthermore, the enhanced graphitization degree of the C/C composites after high-temperature heat treatment is demonstrated to be the primary factor governing the increase in modulus and the reduction in the coefficient of thermal expansion of the composites.

Key words： honeycomb sandwich structure; thin-layered C/C composite; mechanical property; thermal expansion property; high-temperature heat treatment

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