Features intact flake crystals that are thin and highly ductile, with excellent physical and chemical properties, including good thermal conductivity, high-temperature resistance, self-lubrication, electrical conductivity, thermal shock resistance, and corrosion resistance.
High-purity graphite (also known as flake-shaped high-thermal-conductivity carbon powder) offers advantages such as high strength, excellent thermal shock resistance, high-temperature resistance, oxidation resistance, low electrical resistivity, corrosion resistance, and ease of precision machining, making it an ideal inorganic non-metallic material. It is used in the manufacture of electric heating elements, structural casting molds, crucibles and boats for smelting high-purity metals, heaters for single-crystal furnaces, graphite for electrical discharge machining, sintering molds, cathodes for vacuum tubes, metal plating, graphite crucibles for semiconductor technology, as well as graphite anodes and grids for electron emitter tubes, thyratrons, and mercury-arc rectifiers.
High-purity graphite features high strength, high density, high purity, excellent chemical stability, a dense and uniform structure, high-temperature resistance, high electrical conductivity, good wear resistance, self-lubrication, and ease of machining. It is widely used in industrial sectors such as metallurgy, chemical engineering, aerospace, electronics, machinery, and nuclear energy. In particular, large-sized, high-quality high-purity graphite, as a substitute material, offers broad application potential in high-tech and emerging technology fields, with extensive future prospects.
There are two primary methods: wet purification, which includes flotation, acid-base leaching, and hydrofluoric acid treatment; and pyrometallurgical purification, which includes chlorination roasting and high-temperature processing.
There is a key issue with the use of flake graphite in refractory materials: poor wettability.
Specifically:
Flake graphite has low surface tension, and its surface contains approximately 0.45% volatile organic compounds.
The graphite surface is highly hydrophobic, resulting in poor wettability with the silicate liquid phase.
It tends to agglomerate in castables, making it difficult to disperse uniformly, which affects the material’s density.
It should be stored in a dry, well-ventilated environment to prevent caking caused by moisture. Avoid direct sunlight and high temperatures. Packaging must be tightly sealed to prevent moisture absorption and deterioration.
Expandable graphite is a graphite intercalation compound. It is produced by using natural flake graphite as raw material and introducing acids (such as sulfuric acid) and oxidizing agents into the graphite layers through chemical or electrochemical methods.
Graphite consists of countless layers of graphene stacked on top of one another, while graphene is a single layer of graphite. You can think of it this way: if you repeatedly wrap graphite with adhesive tape and peel it off, you may eventually obtain a single layer of graphene—which is, in fact, how it was originally discovered.
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