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Simultaneously enhancing mechanical and tribological properties of carbon fiber composites by grafting SiC hexagonal nanopyramids for brake disk application

查看全文 作　　者：Yao [1]Guo;Leilei [1]Zhang;Qiang [1]Song;Ruonan [1]Zhang;Fei [1]Zhao;Wei [1]Li;Hongchao [2]Sheng;Xianghui [3]Hou;Hejun [1]Li 高影响力作者 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;[2]Department of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;[3]Faculty of Engineering,The University of Nottingham,University Park,Nottingham NG72RD,United Kingdom高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2022年第26期,共8页高影响力期刊 基　　金：the National Natural Science Foundation of China(Nos.51872232,51972271,and 51872234);Natural Science Basic Research Plan in Shaanxi(No.2022JC-25)。 摘　　要：Extensive attention has been drawn to the development of carbon fiber composites for their application in brake disks due to the increasing demand for brake disks with high mechanical strength and better tribological properties.Herein,we design SiC hexagonal nanopyramids modified carbon/carbon(SiCNPsC/C)composites,in which SiCNPs are radially grafted on the carbon fibers by the combined sol-gel and carbothermal reduction method,and pyrolytic carbon(Py C)matrix is deposited on nucleation sites including carbon fibers and SiCNPs by isothermal chemical vapor infiltration(ICVI).Benefiting from the special structure,SiCNPs-C/C composites exhibit superior mechanical and frictional performance.Compared with C/C composites,SiCNPs-C/C composites have 147%,90.3%,70.6%,and 117.9%improvement in the hardness,interlaminar shear strength,and out-of-plane and in-plane compressive strength,respectively,which is attributed to the optimized fiber/matrix(F/M)interfaces bonding and the enhanced cohesion strength of Py C matrix.In addition,the friction coefficient of SiCNPs-C/C composites increases by 25.5%,and the wear rate decreases by 38.0%.This work provides an optional design thought for the nanomaterials and enlightens the mechanical and frictional modification of composites in the field of the brakes. 关 键 词：SiC hexagonal nanopyramids Carbon/carbon composites Microstructure Mechanical properties Tribological properties
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