中文摘要：

研究各向同性微细颗粒石墨ZXF-5Q的微结构及熔盐浸渗特性。使用光学显微镜、压汞仪、真密度仪、透射电子显微镜、X射线衍射仪以及拉曼光谱仪,对其气孔、煅烧裂纹、Mrozowski裂纹及晶体结构进行表征。结果表明,ZXF-5Q拥有均匀分布的气孔,非常小的入孔孔径（0.4μm）,数量众多的透镜状Mrozowski裂纹以及良好的晶体结构。熔盐浸渗实验在不同压力（分别为1、3、5个大气压）650℃环境下进行。利用扫描电子显微镜和X射线能谱仪对其浸渗特性进行了观察分析。研究表明,由于其非常小的入口孔径,ZXF-5Q在5个大气压外加压强环境下依然可以很好阻止熔盐浸渗。尽管没有浸渗发生,在ZXF-5Q内部可以发现球形熔盐颗粒,可能是熔盐蒸汽凝结造成的。

英文摘要：

The microstructure and molten salt impregnation characteristics of a micro-fine grain isotropic graphite ZXF-5Q from Poco Inc. was investigated. The microstructural characteristics of the pores caused by gas evolution,calcination cracks,Mrozowski cracks,and the crystal structure were characterized by optical microscopy,mercury porosimetry,helium pycnometry,transmission electron microscopy,X-ray diffraction and Raman spectroscopy. Results show that the ZXF-5Q has uniformly-distributed pores caused by gas evolution with very small entrance diameters（ ~ 0. 4 μm）,and numerous lenticular Mrozowski cracks. Molten salt impregnation with a molten eutectic fluoride salt at 650 ℃ and 1,3 and 5 atm,indicate that ZXF-5Q could not be infiltrated even at 5 atm due to its very small pore entrance diameter. Some scattered global salt particles found inside the ZXF-5Q are possibly formed by condensation of the fluoride salt steam during cooling.