Wettability of graphite and its application limitation

The low surface tension and large area of graphite without defects, as well as the presence of volatile organic compounds on its surface, all aggravate the wettability of graphite. The strong hydrophobicity of graphite surface deteriorates the fluidity of castable material, and the graphite structure is easy to produce aggregation and cannot be uniformly distributed and dispersed in the refractory, so it is difficult to prepare uniform dense amorphous refractory.

The microstructure and properties of high temperature silicate liquid depend largely on its wettability to graphite. When wetting, in the capillary force of silicate liquid, particles flow into the gap, by the said adhesion between the graphite particles, forming a film around the graphite, after cooling to form a continuum, cooling with graphite to form a high adhesion interface. If the two are not wetted, the graphite nanoparticles form a collective, and the silicate liquid phase is confined to the particles passing through the gap to form an isolated body, so it is difficult to form a compact complex in the sintering process at high temperature. Therefore, the wettability of graphite must be improved in order to produce high performance carbon containing refractory. In recent years, a large number of surface modification technologies of graphite have been analyzed, and some progress has been made. A variety of surface modification treatments of graphite have been studied.

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