You can find numerous types of graphite,
like High Purity Graphite, Graphite Block, Artificial Graphite, carbon graphite
or Carbon Block, carbon graphite materials, and so on., and in addition they
possess the same and various nature.（Edm Graphite）
In fact, there is no pure graphite in
nature, which often contains A1203, Fe0, Si02, CaO, P2O5, Cu0 as well as other
impurities. These impurities frequently occur inside the form of quartz,
pyrite, carbonate as well as other minerals. Furthermore, you will find water,
asphalt, CO2, H2, N2, CH4 as well as other gas parts. Consequently, for the
evaluation of graphite, except for the determination of carbon content
material, we have to also determine the contents of volatile and ash. Graphite
owes its following traits to characteristics of its structure.
1) Withstanding higher temperatures:
Graphite’s melting point and boiling point are really high, even by means of an
ultra higher temperature arc ignition, its weight-loss is quite modest, and its
thermal expensively can also be quite little. The graphite strength increases
with the temperature, as well as the graphite intensity is doubled.（Glass Handling）
2) Electrically and thermally conductive:
the conductivity of graphite is one hundred instances higher than that of
common nonmetal ore. And its thermal conductivity exceeds that of steel, iron,
lead and also other metal materials. The thermal conductivity decreases with
all the boost of temperature, even below extremely high temperatures, graphite
becomes a heat insulator.（Cz Crystal
Grower）
3) Lubrication: the lubrication performance
of graphite depends upon the size of graphite flake, the bigger its flake it
truly is, and also the smaller the friction coefficient is, the much better the
lubrication overall performance is.
four) Chemical stability: graphite has very
good chemical stability at space temperature, being able to tolerate acid,
alkali and corrosion resistance to organic solvents.
5) Plasticity: the toughness in the
graphite is quite excellent, and it may be created into quite thin slice.
6) Thermal shock resistance: Graphite can
withstand the temperature modifications with no becoming destroyed when
graphite is employed at room temperature. And when the temperature adjustments
abruptly, the volume of graphite adjustments less and will not make any crack.
The technological properties of graphite
primarily depend on its crystalline kind. The graphite minerals with various
crystalline kind have different industrial worth and use. In market, in
accordance with the distinction of crystalline morphology, organic graphite
might be divided into three sorts:
1. Dense crystalline graphite: it's also
named blocky graphite. Such graphite crystal seems clear and its crystal could
be visible. Its crystal arrangement is disordered and seems a dense mass
structure. The traits of such graphite are high grade, but its Plasticity and
unctuousness aren’t as good as flake graphite.
two. Flake graphite: Graphite crystals
appear scaly; this is produced of becoming deteriorated beneath a pressure of
high strength, and it may be divided into: a large scale and fine scale. The
traits of this sort of graphite ore is its not extremely high grade. And it’s
one of many greatest ore with floatability in nature, soon after much more
times of grinding and deciding on we are able to obtain the high-grade graphite.
The floatability, lubrication and plasticity of this kind of graphite are much
more exceptional than that of other sorts of graphite; therefore, the
industrial value of it really is the largest.
three. Aphanitic graphite: it’s also known
as amorphous or soil shaped graphite, and it's a collection of microcrystalline
graphite, whose crystal only may be observed beneath the electron microscopy.
This sort of graphite is featured by a surface shaped like earth, lacking of
luster, and poor lubrication having a high grade scale. The optionality of the
ore is worse.
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