Graphite high temp insulation Refractory Materials Iron and steel smelting
Ink is an allotrope of carbon. It is a gray black and opaque solid with stable chemical properties and corrosion resistance. It is not easy to react with acid, alkali and other agents. It burns in oxygen to produce carbon dioxide, which can be oxidized by strong oxidants such as concentrated nitric acid and potassium permanganate. It can be used as anti-wear agent and lubricant. High purity graphite can be used as neutron reducer in atomic reactor. It can also be used to manufacture crucibles, electrodes, brushes, dry batteries, graphite fibers, heat exchangers, coolers, electric arc furnaces, arc lamps, pencil refills, etc.
Physical and chemical properties
Graphite is soft, black gray, greasy and can pollute paper. The hardness is 1 ~ 2, and the hardness can increase to 3 ~ 5 with the increase of impurities in the vertical direction. The specific gravity is 1.9 ~ 2.3. The specific surface area is concentrated in the range of 1-20m2 / g. when isolated from oxygen, its melting point is above 3000 ℃, which is one of the most temperature resistant minerals. It can conduct electricity and heat.
There is no pure graphite in nature, which often contains SiO2, Al2O3, FeO, Cao, P2O5, CuO and other impurities. These impurities often appear in the form of quartz, pyrite, carbonate and other minerals. In addition, there are gas parts such as water, asphalt, CO2, H2, CH4 and N2. Therefore, for the analysis of graphite, in addition to the determination of fixed carbon content, the content of volatile and ash must be determined at the same time.
Graphite, diamond, carbon 60, carbon nanotube, graphene, etc. are all elemental elements of carbon, and they are isomorphic and heteromorphic to each other.
Graphite has the following special properties due to its special structure:
(1) High temperature resistance
(2) Conductivity and thermal conductivity
(4) Chemical stability
(6) Thermal shock resistance