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 ?
Finally a dense (5 to 10 [micro]m thick) pyrolytic carbon coating is deposited upon the carbide shell at 1300[degrees]C in a 0.4% propane-butane argon mixture.
Based on the FID response and laser-transmission data, the amounts of organic, elemental, and pyrolytic carbon are then calculated for the sample.
This method uses pyrolytic carbon planchets (available from electron microscopy suppliers) as specimen mounts.
* the decomposition of the foam pattern in casting ferrous alloys resulting in the formation of solid pyrolytic carbon (lustrous carbon).
Therefore, this tar was anticipated to be able to decompose into a large amount of pyrolytic carbon or secondary char, as compared to tar produced at other temperatures.
In the fuel element of HTR-PM, [sup.60]Co in porous pyrolytic carbon (buffer layer) and dense inner pyrolytic carbon (IPyC) of TRISO fuel particle will diffuse and interact with silicon carbide (SiC) of TRISO fuel particle [1], which is considered to possibly influence the performance of SiC.
The ORNL technique uses a proprietary pretreatment to recover pyrolytic carbon black material, which is similar to graphite but man-made.
[5] showed that the blood compatibility of TiN films was as good as that of low-temperature isotropic pyrolytic carbon and the durability of titanium heart valve cages coated with TiN increased seven-fold.
The second, third, and fourth coatings are pyrolytic carbon, silicon carbide, and pyrolytic carbon, respectively, all layered to provide radiation, gas, and mass diffusion barriers and to act in concert as a pressure containment vessel.
For Direction I, Zone 1 exhibits a typical microstructure of carbon fibers coated with pyrolytic carbon (Figure 3(a)).
Pyrolytic carbon is mainly used as an artificial heart valve material because of its good strength, wear resistance and durability, and most importantly, thromboresistance or the ability to resist blood clotting.
The porous preform becomes enveloped in a vapor film that infiltrates it and rapidly deposits pyrolytic carbon from the inside out.