新型炭材料Issue(3)：275-281,7.
沉积在核石墨IG-110基体上的热解炭涂层微观结构
Microstructure of a pyrolytic carbon coating on a nuclear graphite substrate IG-110
摘要
Abstract
The molten salt reactor ( MSR) is one of the six Generation IV reactors that is being reexamined today, owing to its unique fuel cycle capabilities and safety characteristics. IG-110 nuclear graphite a candidate material for constructing a MSR. However, the existence of large pores at its surface is a big problem due to the impregnation of molten salts and the diffusion of fission product gases into the graphite through the pores. A pyrolytic carbon ( PyC) coating can act as a barrier coating on the nuclear graphite. Investigation of the microstructure and growth characteristics of PyC is very important for an understanding of the relationship between microstructure and performance. In this study, polarized light microscopy, scanning electron microscopy, transmission electron microscopy and synchrotron based grazing incidence X-ray diffraction were used to study the microstructure and growth characteristics of the PyC coating. Results show that the PyC coating shows three growth cones ( a large cone, a smaller one and a regenerative cone) and exhibits a wave-like layered structure. The resulting structure is fairly dense. There are two kinds of textures in the PyC coating:smooth laminar and regenerative laminar, each of which contains two crystal structures with different interlayer spacings. The smooth laminar carbon has mostly a low degree of graphitization, while the regenerative laminar structure mainly has a high degree of graphitization. The PyC coating is a perfect barrier to gas infiltration due to its compact structure and it containing only nanopores rather than large pores.关键词
热解炭/微观结构/透射电子显微镜/同步辐射掠入射X 射线衍射Key words
Pyrolytic carbon/Microstructure/Transmission electron microscopy/Synchrotron based grazing incidence X-ray diffraction分类
化学化工引用本文复制引用
冯尚蕾,杨迎国,白朔,许力,杨新梅,夏汇浩,周兴泰..沉积在核石墨IG-110基体上的热解炭涂层微观结构[J].新型炭材料,2015,(3):275-281,7.基金项目
中澳国际合作ANSTO-SINAP联合材料研究项目(2014DFG60230) （2014DFG60230）
中国科学院战略先导专项(XDA02040200) （XDA02040200）
国家重点基础研究发展计划(973计划,2010CB934503) （973计划,2010CB934503）
中国科学院大科学装置开放研究项目(Y028041061).@@@@ Program of International S & T Cooperation ANSTO-SINAP (2014DFG60230) （Y028041061）
Strategic Priority Research Program of the Chinese Academy of Sciences ( XDA02040200) （ XDA02040200）
National Basic Research Program (973 Program,2010CB934503) （973 Program,2010CB934503）
Open Research Program on Large Scientific Facility of the Chinese Academy of  （）
Sciences (Y028041061) （Y028041061）
