Pyrolytic Graphite

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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.

References in periodicals archive ?
When used in the technology of production of the pyrolytic carbon composites under consideration, the CM obtained with it is called pyrocarbon carbon fiber [7].
9) PAHC (Bulkamid[TM]), (10) calcium hydroxyapatite (Coaptite[TM]), (11) pyrolytic carbon (Durasphere[TM]), (12) and polydimethylsilaxone (Macroplastique[TM]) (13) have demonstrated non-inferiority to collagen in randomized, controlled studies.
Manufacturers develop mechanical heart valves from synthetic materials such as pyrolytic carbon, titanium alloy, and cobalt-based alloys and tissue heart valves from bovine, porcine, and human tissues.
Pesakova V, Klezl Z, Balik K, Adam M (2000) Biomechanical and biological properties of the implant material carbon-carbon composite covered with pyrolytic carbon.
The exact nature of the pyrolytic carbon is a mixture of allotropes but mostly resembles hard carbon type, with strong graphitic nature.
The introduction of the bileaflet mechanical valve and use of pyrolytic carbon as a valve material have reduced the risk of thrombosis; pyrolytic carbon is more biocompatible and thrombo-resistant and wear resistant.
Among the topics are Bessel plasmons for near-field optical microscopy with nanoscale resolution, charge accumulation and edge state transport in graphene nanoribbons, experiment and modeling microwave absorption in pyrolytic carbon nanofilms, ion-selective detection with a glass nanopipette for living cells, electrokinetic properties of aluminum nanopowders in citric acid solution, and the effect of annealing on the shielding properties of shungite.
The ORNL technique uses a proprietary pretreatment to recover pyrolytic carbon black material, which is similar to graphite but man-made.
Method for Chemical Infiltration in the Gas Phase for the Densification of Porous Substrates With Pyrolytic Carbon," Jacques Thebault, Sebastien Bertrand, Christian Robin-Brosse, Bruno Bernard, and Jean-Luc Domblides (Snecma Propulsion Solide, Le Haillan, France).
Chapters look at hydrophilic, mineral and pyrolytic carbon coatings in and ex vivo orthopaedic applications and finally at surface modification and preparation techniques.
The acquisition will add Ascension's pyrolytic carbon technology, while enabling Integra to set foot on the shoulder implants market.
Uranium dioxide nuclear fuel, coated with mass diffusion and radioactive fission product containment layers of pyrolytic carbon and silicon carbide, is formed into nuclear poppy seed-sized fuel particles.