TiC改性碳纳米管增强中间相炭微球制备各向同性石墨  

TiC-modified CNTs as reinforcing fillers for isotropic graphite produced from mesocarbon microbeads

作　　者：林祥宝 陈惠[1] 巫静[1] 吴志刚 李润 刘洪波[1] LIN Xiang-bao;CHEN Hui;WU Jing;WU Zhi-gang;LI Run;LIU Hong-bo(College of Material Science and Engineering,Hunan University,Hunan,Changsha 410082,China;Hunan Changyu Science and Technology Development Co.,Ltd.Hunan,Changsha 410063,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]湖南长宇科技发展有限公司,湖南长沙410063

出　　处：《新型炭材料》2021年第5期961-970,共10页New Carbon Materials

基　　金：国家科技部“十三五”国家重点研发计划重点专项(2017YF0310905);国家自然科学基金(51402101);湖南省科技重大专项项目(2018GK4012,2018GK1030).

摘　　要：采用无压放电等离子烧结技术,用纳米TiC改性多壁碳纳米管(MWCNTs),将纳米TiC改性后的碳纳米管(T-CNTs)掺杂到中间相炭微球(MCMB)中以制备高性能的各向同性石墨材料。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微(TEM)等对T-CNTs和制备的石墨材料结构进行表征;并采用万能试验机、激光导热仪和热膨胀系数仪测试了制备石墨材料的力学性能和热学性能。结果表明,纳米TiC成功的附着在CNTs的表面。与未添加T-CNTs的各向同性石墨相比,T-CNTs/MCMB各向同性石墨材料其力学强度有显著的提高,材料的抗折强度提高了70%,石墨化度提高10%,热学性能也有不同程度的提高。Multi-wall carbon nanotubes(CNTs)were modified by nano-TiC using a pressureless spark plasma sintering techno-logy.The TiC-modified CNTs(T-CNTs)were added to mesocarbon microbeads(MCMBs)to prepare high performance isostatically pressed graphite materials.The structures of the T-CNTs and the prepared isotropic graphite materials were characterized by XRD,SEM and TEM.The mechanical and thermal properties of isotropic graphite reinforced by T-CNTs were measured by a micro-con-trolled electronic universal testing machine,laser thermal conductivity meter and thermal expansion coefficient meter.Results showed that the nano-TiC was successfully grown on the surface of CNTs.Compared with the isotropic graphite prepared from MCMBs without T-CNTs,the isotropic graphite with T-CNTs has a significant improvement in physical properties(density,open porosity and volume shrinkage).Its flexural strength and degree of graphitization increased by 70%and 10%,respectively,and the thermal properties were also improved to some degree.

关 键 词：放电等离子烧结 TiC改性多壁碳纳米管 中间相炭微球 各向同性石墨 

分 类 号：TB33[一般工业技术—材料科学与工程]