Preparation and properties of high specific strength carbon/carbon composites based on carbon fiber/carbon foam preforms

被引：0

作者：

Wang, Xingjun ^{[1
]}

Jia, Jiangang ^{[1
,2
]}

Pan, Zikang ^{[3
]}

Liu, Diqiang ^{[1
,2
]}

Zang, Shujun ^{[1
,2
]}

机构：

[1] School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou

[2] State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou

[3] Harbin Boiler Plant CO., LTD., Harbin

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2024年 / 41卷 / 08期

基金：

中国国家自然科学基金;

关键词：

C/C composites; carbon fiber; carbon foam; chemical vapour phase densification; mechanical properties; phenolic resins;

D O I：

10.13801/j.cnki.fhclxb.20240010.001

中图分类号：

学科分类号：

摘要：

Carbon/carbon composites has been widely used in aerospace, weaponry and other fields with their excellent properties. However, the development of carbon/carbon composites has been limited by the high cost of carbon fiber preforms. Carbon foam has a three-dimensional network structure, and its ligaments show similar properties to carbon fibers, which can be used as the reinforcing phase to prepare carbon/carbon composites. In this paper, carbon foams with different carbon fiber volume contents (0vol%, 1vol%, 3vol%, 5vol%, 7vol%) were prepared as carbon/carbon composites preforms by using phenolic resin as the carbon source and NaCl as the pore-forming agent, and the carbon/carbon composites were prepared by using the rapid densification technique of thermal gradient chemical vapour infiltration (TG-CVI), which investigated the effects of carbon fiber content on the carbon fiber/carbon foam preform and its density, microstructure and mechanical properties after densification. The effects of carbon fiber content on the density, microstructure and mechanical properties of the carbon fiber/carbon foam preform and its densification were investigated. The results showed that with the increase of carbon fiber content, the number of microcracks in the carbon fiber/carbon foam precast body increased significantly, the density gradually decreased from 0.51 g/cm3 to 0.31 g/cm3, and the compressive strength decreased from 51.33 MPa to 1.35 MPa, flexural strength decreased from 42.53 MPa to 6.32 MPa. The compressive and flexural strengths of the carbon/carbon composites were significantly increased after densification, up to 183.67 MPa and 123.46 MPa, respectively, while the density was 1.09 g/cm3, resulting in high specific strength. The thermal conductivity of the composites increased from 0.298 W/(m·K) (before densification) to 2.484 W/(m·K), an increase of 734%, which was attributed to the formation of a three-dimensional thermal conductivity network between the carbon fibers and pyrolytic carbon after densification. © 2024 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：4180 / 4188

页数：8

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