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Graphite Machining

Ferro-Ceramic Grinding Inc. machines over 15 different materials

Graphite

Graphite is a naturally occurring form of crystalline carbon. It’s a unique mineral because although it is exceptionally resistant to heat and nearly inert, it’s also very soft and cleaves at only the slightest of pressures. While graphite machining has many uses, its unique properties make it most useful in manufacturing and metallurgy.

Industrial graphite is used in many automotive applications—such as brake lining and gaskets—and is widely used in batteries, lubricants, and even nuclear reactor cores. Of course, anyone who has used a pencil is familiar with graphite, as it’s the primary substance for the writing utensil.

Graphite Properties

Graphite oxidizes under (heated) use in an air (oxidizing) environment and therefore finds its use in inert and vacuum applications such as furnace insulation packages and semiconductors.

Graphite material has the same lubricious properties as boron nitride, thanks to their similar crystal structures. But whereas boron nitride is one of the hardest materials on earth, graphite is quite soft and easily breakable.

This material is most commonly used in inert atmospheres and has a use temperature upwards of 3500°C.

If you’d like to learn more about graphite machining or the properties and materials of graphite, feel free to contact our staff.

PropertiesUnitsTestValue
Physical
Chemical Formula--C
Density, rg/cm3ASTM C202.25
Color--black
Crystal Structure--hexagonal
Water Absorption% @R.T.ASTM C3730.5 - 3.0
HardnessMoh's-1.0 - 1.5
Hardnessknoop (kg/mm2)Knoop 100g--
Mechanical
Compressive StrengthMPa @ R.T.ASTM C77396
Tensile StrengthMPa @ R.T.ACMA Test #44.8
Modulus of Elasticity
(Young's Mod.)
GPaASTM C8484.8
Flexural Strength (MOR)MPa @ R.T.ASTM F41750
Poisson's Ratio, u-ASTM C818--
Fracture Toughness, KIcMPa x m1/2Notched Beam Test--
Thermal
Max. Use Temperature
(* denotes inert atm.)
ºCNo load cond.3650 *
Thermal Shock ResistanceDT (ºC)Quenching200 - 250
Thermal ConductivityW/m-K @ R.T.ASTM C40824
Coefficient of Linear Thermal Expansion, almm/m-ºC (~25ºC through ±1000ºC)ASTM C3728.39
Specific Heat, cpcal/g-ºC @ R.T.ASTM C3510.16
Electrical
Dielectric Constant1MHz @ R.T.ASTM D150--
Dielectric StrengthkV/mmASTM D116--
Electrical ResistivityWcm @ R.T.ASTM D18297 x 10-3
*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.
 

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781.245.1833

sales@ferroceramic.com

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Ferro-Ceramic Grinding Inc.
5 Cornell Place
Wilmington, MA 01887

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