The surface tension of flake graphite is small, there is no defect in large area, and there are about 0.45% volatile organic compounds on the surface of flake graphite, which all deteriorate the wettability of flake graphite. The strong hydrophobicity on the surface of flake graphite worsens the fluidity of castable, and flake graphite tends to aggregate rather than disperse evenly in the refractory, so it is difficult to prepare uniform and dense amorphous refractory. The following small series of Furuite graphite analysis of the wettability and application limitations of flake graphite:
Flake graphite
The microstructure and properties of flake graphite after high temperature sintering are largely determined by the wettability of high temperature silicate liquid to flake graphite. When wetting, silicate liquid phase under the action of capillary force, into the particle gap, by the adhesion between them to bond the flake graphite particles, in the formation of a layer of film around the flake graphite, after cooling to form a continuum, and the formation of high adhesion interface with the flake graphite. If the two are not wetted, the flake graphite particles form aggregates, and the silicate liquid phase is confined to the particle gap and forms an isolated body, which is difficult to form a dense complex under high temperature.
Therefore, Furuite graphite concluded that the wettability of flake graphite must be improved in order to prepare excellent carbon refractories.
Post time: Mar-30-2022