The intensity and completeness of the liquid phase impregnation of graphite is significantly related to the nature of their porous structures, including the pore dimensions. Analysis of the saturation capacity of liquid graphite melts with varying porous structures showed that a decisive factor for impregnation is not the "bottle" pores, exposed by a mercury porometer, but the characteristic pores determined by metallographic analysis. The research was conducted on a conventional batch of grade PROG-2400 graphite and silicon-base liquid melts. Metallographic study of the porous structure of the PROG-2400 was conducted by direct measurement of the nominal pore diameter on photographs of microstructures, produced from 13 fields of view and different zones of microsections under 104-, 210-, 650-, and 1600 magnification.
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