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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。
The microstructure and molten salt infiltration properties of isotropic fine particle graphite ZXF-5Q were studied. The stomatal, calcined crack, Mrozowski crack and crystal structure were characterized by optical microscope, mercury porosimetry, true density, transmission electron microscopy, X-ray diffraction and Raman spectroscopy. The results show that the ZXF-5Q possesses uniformly distributed pores with a very small pore entrance diameter (0.4 μm), a large number of lenticular Mrozowski cracks and a good crystal structure. Molten salt infiltration experiments at different pressures (1,3,5 atm, respectively) at 650 ℃ environment. The infiltration characteristics were observed by scanning electron microscopy and X-ray energy dispersive spectroscopy. Studies have shown that ZXF-5Q can still prevent molten salt infiltration well under a pressure of 5 atm due to its very small inlet aperture. Although infiltration did not occur, spherical molten salt particles could be found inside the ZXF-5Q, probably caused by condensation of molten salt vapor.