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Insight into the change in carbon structure and thermodynamics during anthracite transformation into graphite
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-02-06 , DOI: 10.1007/s12613-019-1859-9
Tian Qiu , Jian-guo Yang , Xue-jie Bai

Abstract

The thermodynamic and kinetic mechanisms of Taixi anthracite during its graphitization process were explored. To understand the variation trends of carbon arrangement order, microcrystal size, and graphitization degree against temperature during the graphitization process, a series of experiments were performed using Raman spectroscopy and X-ray diffraction (XRD). Subsequently, the influencing factors of the dominant reaction at different temperatures were analyzed using thermodynamics and kinetics. The results showed that the graphitization process of Taixi anthracite can be divided into three stages from the perspective of reaction thermodynamics and kinetics. Temperature played a crucial role in the formation and growth of a graphitic structure. Meanwhile, multivariate mechanisms coexisted in the graphitization process. At ultrahigh temperatures, the defects of synthetic graphite could not be completely eliminated and perfect graphite crystals could not be produced. At low temperatures, the reaction is mainly controlled by dynamics, while at high temperatures, thermodynamics dominates the direction of the reaction.



中文翻译:

洞察无烟煤转化为石墨期间碳结构和热力学的变化

摘要

探索了太溪无烟煤石墨化过程中的热力学和动力学机理。为了了解石墨化过程中碳排列顺序,微晶尺寸和石墨化程度随温度的变化趋势,使用拉曼光谱和X射线衍射(XRD)进行了一系列实验。随后,利用热力学和动力学分析了不同温度下显性反应的影响因素。结果表明,从反应热力学和动力学的角度来看,太溪无烟煤的石墨化过程可分为三个阶段。温度在石墨结构的形成和生长中起着至关重要的作用。同时,石墨化过程中同时存在多种机理。在超高温下,不能完全消除合成石墨的缺陷,并且不能产生完美的石墨晶体。在低温下,反应主要由动力学控制,而在高温下,热力学主导反应的方向。

更新日期:2020-02-06
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