The microstructure of nuclear graphite binders
The microstructure of nuclear graphite binders
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DOI：
10.1016/j.carbon.2007.10.025
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发表时间：
2008-01-01
期刊：
影响因子：
10.9
通讯作者：
Marsden, B. J.
中科院分区：
文献类型：
--
作者：
Wen, K. Y.;Marrow, T. J.;Marsden, B. J.
用光学显微镜、透射电镜和高分辨透射电镜对两种级别的核石墨（Gilsocarbon石墨和Pile Grade A石墨）的结合剂的微观结构进行了表征。观察到各种结构的碳，包括良好的石墨化结构，纳米级石墨颗粒，喹啉不溶性（QI）颗粒，混沌结构和非石墨化碳。在中间相球的表面和内部都观察到了QI颗粒。QI颗粒聚集在中间相球体的表面上，或非常接近中间相球体的表面，似乎对中间相结构的发展有显著影响，导致中间相球体在其聚结之前细化。混沌结构，这是乱层和各向同性的，建议已开发出的各向同性沥青之间的中间相球。非石墨化碳由尺寸通常小于lnm的平坦和弯曲的单层石墨烯片段组成。两种石墨中不同结构的形成归因于在石墨制造阶段引入不同的螺距。(c)2007爱思唯尔有限公司保留所有权利。
The microstructures of the binder in two grades of nuclear graphite, Gilsocarbon graphite and Pile Grade A graphite, were characterized by light microscopy, transmission electron microscopy and high resolution transmission electron microscopy. A variety of structures of carbon were observed, including a well-graphitized structure, nanosized graphite particles, quinoline insoluble (QI) particles, chaotic structures and non-graphitizing carbon. QI particles were observed on the surface of mesophase spheres as well as inside mesophase spheres. The aggregation of QI particles on the surface of mesophase spheres, or very near the surface in mesophase spheres, appears to have a significant influence on the development of the mesophase structure, resulting in refinement of the mesophase spheres before their coalescence. The chaotic structure, which is turbostratic and isotropic, is suggested to have developed from the isotropic pitch remaining between mesophase spheres. The non-graphitizing carbon consisted of flat and curved single layer graphene fragments with a size typically less than 1 nm. The formation of the various structures in the two graphites is attributed to the introduction of different pitches at stages of the graphite manufacture. (c) 2007 Elsevier Ltd. All rights reserved.