Pyrolytic Graphite

(also called pyrographite), a poly-crystalline carbonaceous material that is deposited from the gas phase during pyrolysis of hydrocarbons at temperatures that range from 750° to 2400°C.

Depending on the conditions of pyrolysis, including temperature, concentration of initial materials, and type of diluent, pyrolytic graphite can have high density or low density as well as anisotropic or practically isotropic properties. Two brands of pyrolytic graphite are used in the USSR: PGV graphite, which is highly anisotrophic, and PGI graphite, which is isotropic. Pyrolytic graphite has high thermal stability and lacks open pores. It is used to make crucibles and other apparatus for the production of semiconductors, glass, single-crystal materials, and pure metals. PGI graphite is used as an antifriction packing material, and PGV graphite is used for erosion-resistant coatings.