Effect of mesophase formation from quinoline insoluble-containing coal tar pitch on physical properties of carbon blocks

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-04-29 DOI:10.1007/s42823-024-00737-x

Jung-Jin Kim, Sang-Hye Lee, U-Sang Youn, Sun-Ung Gwon, Tae-Sub Byun, Jae-Seung Roh

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Abstract

In the present study, a coal-based pitch containing 12.1% quinoline insoluble (QI) underwent isothermal heat treatment, and changes in the mesophase microstructure were analyzed for the heat treatment duration. The nuclei creation and growth rate of mesophase were affected by the distribution of QI particles in the pitch. The growth process could be explained in four regions through the mesophase area fraction. During the carbonization of carbon blocks, mesophase formation was induced in the binder phase. The physical properties of carbon blocks were measured as a function of residence time. As residence time increased, bulk density decreased and porosity increased, but electrical conductivity increased. It was determined that forming a mesophase in the binder phase during carbonization reduced the size of large pores in carbon block and improved the connectivity between particles, thereby increasing electrical conductivity. These results are expected to show greater improvement in electrical properties after graphitization.

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含喹啉的煤焦油沥青形成的介相对碳块物理性质的影响

本研究对含 12.1% 喹啉不溶物（QI）的煤基沥青进行了等温热处理，并分析了热处理持续时间对介相微观结构的影响。沥青中 QI 粒子的分布影响了介相晶核的产生和生长速度。通过介质相面积分数可将生长过程分为四个区域。在碳块的碳化过程中，粘合剂相中诱发了介相的形成。测量了碳块的物理性质与停留时间的函数关系。随着停留时间的增加，体积密度降低，孔隙率增加，但导电率增加。结果表明，在碳化过程中在粘合剂相中形成介相，可以减小碳块中大孔隙的尺寸，改善颗粒之间的连通性，从而提高导电性。这些结果表明，在石墨化之后，导电性能有望得到更大的改善。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.