Deep understanding of typical CNT morphology on the microstructure and mechanical properties of 2D carbon/carbon composites  

作　　者：Jiajia Sun Qiang Song Liyuan Han Xuemin Yin Hejun Li 

机构地区：[1]State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Northwestern Polytechnical University,Xi'an,710072,China

出　　处：《Journal of Materiomics》2024年第2期396-407,共12页无机材料学学报（英文）

基　　金：supported by National Natural Science Foundation of China(52293371,52222204,52202047,52172103,52072304);Natural Science Basic Research Plan in Shaanxi(2022JC-25,2022JQ-324);the Key R&D Program of Shaanxi Provence(2019ZDLGY04-02);China Postdoctoral Science Foundation(2021M702659);Young Talent Fund of Association for Science and Technology in Shaanxi,China(20220435);State Key Laboratory of Advanced Technology for Materials Synthesis and Processing(Wuhan University of Technology)(2023-KF-25);Project supported by the Research Fund of the State Key Laboratory of Solidification Processing(NPU),China(2023-BJ-03).

摘　　要：For the inadequate interlaminar strength of 2D carbon/carbon(C/C)composite,in-situ grown carbon nanotubes(CNTs)reinforcing strategy was put forward to strengthen the interlaminar matrix at the nanoscale and inhibit the interlaminar cracking.CNT morphology is an essential factor in influencing the enhancement effect.Herein,the influence of in-situ grown CNT morphology on the microstructure and mechanical properties of C/C composite was deeply studied.The radially-aligned straight CNTs could induce the formation of highly-ordered pyrolytic carbon(PyC),while PyC in randomly-distributed curved CNTs concentrated area exhibits an isotropic structure.Further,radially-aligned straight CNTs show better improvement on the flexural and shear strength of C/C composites.According to the fine structural characterization and finite element simulation,the influence mechanism of CNT morphology was revealed.CNT morphology can influence the stress distribution in the PyC protective layer,and compared with radially-aligned straight CNTs,randomly-distributed curved CNTs induce higher tensile stress in the PyC protective layer,which has a detrimental impact on the flexural and shear properties of C/C com-posite.This work provides novel insights into the effect of CNT morphology on the microstructure and mechanical properties of C/C composites,which gives a basis for the structural design and preparation of CNTs reinforced C/C composites.

关 键 词：CNT morphology C/C composite Microstructure Mechanical properties 

分 类 号：TB33[一般工业技术—材料科学与工程]