Preparation of Needle Cokes with High Electrical Conductivity and Low Coefficient of Thermal Expansion

被引：0

作者：

Qin B. ^{[1
]}

Wang Q. ^{[1
]}

Wang F. ^{[1
]}

Jin L. ^{[1
]}

Xie X. ^{[1
]}

Cao Q. ^{[1
]}

机构：

[1] Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2019年 / 33卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Coefficient of thermal expansion; Mesocarbon microbead; Needle coke; Resistivity; Secondary growth; Synthesizing and processing technics;

D O I：

10.11901/1005.3093.2017.787

中图分类号：

学科分类号：

摘要：

Needle-cokes (NCs) were synthesized via a two-step process, namely mesocarbon microbeads (MCMB) were firstly blended with coal tar pitch (CTP) at 180℃ for ca 30 min, and which was then calcined in an autoclave filled with 0.5 MPa nitrogen at 1500℃ for 5 h. The microstructure of mesophase, semi-cokes and the final product NCs was characterized by means of polarizing microscope, XRD and SEM. The resistivity and coefficient of thermal expansion (CTE) were measured by resistivity meter and thermal mechanical analyzer, respectively. The results show that the addition of moderate amount of MCMB could affect the formation of NCs, so that promote the formation of graphite-like layered structure, which significantly reduced the resistivity and CTE value of NCs. The structure of needle-cokes could be effectively improved with the increase of MCMB content (≤50 mass fraction% ). However, the quality of needle-cokes began to decline as the content of MCMB exceeded 50%. The resistivity and CTE value (at 0-100℃) of NCs decreased by 27.9% and 45.7%, respectively, when the content of MCMB is 50% in feedstock, meanwhile, the corresponding graphitization degree increased by 46.2%, as comparing with the parent needle-coke. © All right reserved.

引用

页码：53 / 58

页数：5

共 16 条

[1] Kumar S., Srivastava M., Influence of presence/addition of asphaltenes on semi-coke textures and mesophase development in petroleum feed stocks, Fuel, 173, (2016)
[2] Kang H.G., Park J.K., Han B.S., Et al., Electrochemical characteristics of needle coke refined by olten caustic leaching as an anode material for a lithium-ion battery, Journal of Power Sources, 153, 1, (2006)
[3] Wang J., Wang L., Chen M., Et al., Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors, New Carbon Materials, 30, 2, (2015)
[4] Tang X.Y., Wei X.H., Et al., Removal of QI from medium-temperature coal tar pitch and preparation of needle coke through carbonization, Chinese Journal of Materials Research, 30, 6, (2016)
[5] Cai C., Chen Y., Wang F., Et al., The prospects for the development of coal based needle coke industry, Fuel & Chemical Processes, 48, 6, (2017)
[6] Alvarez P., Diez N., Santamaria R., Et al., Novel coal-based precursors for cokes with highly oriented microstructures, Fuel, 95, (2012)
[7] Cheng X., Zha Q., Li X., Et al., Modified characteristics of mesophase pitch prepared from coal tar pitch by adding waste polystyrene, Fuel Processing Technology, 89, 12, (2008)
[8] Brzozowska T., Zielinski J., Machnikowski J., Effect of polymeric additives to coal tar pitch on carbonization behaviour and optical texture of resultant cokes, Journal of Analytical and Applied Pyrolysis, 48, 1, (1998)
[9] Lin Q., Li T., Ji Y., Et al., Study of the modification of coal-tar pitch with p-methyl benzaldehyde, Fuel, 84, 2, (2005)
[10] Lin Q., Li T., Zheng C., Et al., Carbonization behavior of coal-tar pitch modified with divinylbenzene and optical texture of resultant semi-cokes, Journal of Analytical and Applied Pyrolysis, 71, 2, (2004)

← 1 2 →