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Carbon & Graphite
Manufacturing Process
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Grade Table
General Characteristics
Impervious Graphite
SiC (CVR)
General Characteristics
SiC Coating Graphite와
Carbon/Graphite의 비교
SiC Coating Graphite Heater
SiC (CVD)
General Characteristics
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General Characteristics
STRONG RESISTANCE TO HEAT : CAN BE USED IN HIGH-TEMPERATURE CONDITIONS
Carbon and graphite can be used at temperatures
of up to 3,000˚C in inert atmospheres, and can
also be used up to a maximum of 400˚C in air.

Atmosphere Maximum temperature at which
these can be used
Air
Steam
Hydrogen
Vacuum
Nitrogen
Chlorine
Argon
400 ˚C
700 ˚C
1,000 ˚C
2,200 ˚C
2,200 ˚C
2,500 ˚C
3,000 ˚C

THERMAL EXPANSION IS SMALL : DIMENSIONS THEREFORE REMAIN STABLE
The gragh at right exhibits a comparison thermal
expansion coefficient of graphite and other
materials. The thermal expansion figures for
carbon and graphite are considerably lower than those for metals.


CARBON AND GRAPHITE ARE GOOD CONDUCTORS OF HEAT
The gragh at right compares the thermal
conductivities of graphite and other materials.
Graphite has high thermal conductivity.
 
THERMAL SHOCK RESISTANCE
The following general formula shows thermal shock
resistance. Carbon has high thermal conductivity and low coefficient of thermal expansion, with a small Young's modulus. Carbon therefore has superior resistance to thermal shock.
Thermal Shock Resistance (cal/cm·sec) =
K : Thermal Conductivity (cal/cm·sec·˚C)
α : Confficient of Thermal Expansion(1/˚C)
S : Thesile Strength (kg/㎠)
E : Young's Modulus (kg/㎟)
  Young's Modulus(kg/㎟)
Graphite 500 ~ 1,500
Glass
600 ~ 750
Iron 9,000
Copper 11,000
Tungsten 35,000
GRAPHITE'S STRENGTH INCREASES AT HIGH TEMPERATURES
When metallic materials are heated to high
temperatures , their strengths decrease, but
graphite becomes stronger at high temperatures.

 
GRAPHITE IS STRONGLY RESISTANT TO CORROSION AND IS NOT
ATTACKED BY CHEMICALS
Graphite is generally not corroded by acide and alkalis at room temperatures. Mixed acids,
such as a mixture of phosphoric acid and potassium dichromate, can oxidize graphite
GRAPHITE IS LIGHT IN WEIGHT AND CAN BE PROCESSED EASILY
The apparent density of graphite is around 2, less
than that of aluminum, the lightest of metals.
The specific gravity of graphite is 1/3 of copper or
iron. Graphite is easily machined, so that precise
machining of graphite can be avaiable.
 
GRAPHITE HAS INHERENT LUBRICITY
Graphite has inherent lubricity, and will not damage other materials with which it comes in contact.
MOLTEN METALS AND MOLTEN GLASS DO NOT ADHERE TO GRAPHITE
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