Ceramic Properties - Graphite
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 semiconductor. This ceramic parts material has the same lubricious properties as boron nitride thanks to the same crystal structure. Used in inert atmospheres, use temperature can be upwards of 3500C.
Properties Units Test Value Physical Chemical Formula C Density, r g/cm3 ASTM C20 2.25 Color black Crystal Structure hexagonal Water Absorption % @R.T. ASTM C373 0.5 - 3.0 Hardness Moh's 1.0 - 1.5 Hardness knoop (kg/mm2) Knoop 100g -- Mechanical Compressive Strength MPa @ R.T. ASTM C773 96 Tensile Strength MPa @ R.T. ACMA Test #4 4.8 Modulus of Elasticity
GPa ASTM C848 4.8 Flexural Strength (MOR) MPa @ R.T. ASTM F417 50 Poisson's Ratio, u ASTM C818 -- Fracture Toughness, KIc MPa x m1/2 Notched Beam Test -- Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 3650 * Thermal Shock Resistance DT (C) Quenching 200 - 250 Thermal Conductivity W/m-K @ R.T. ASTM C408 24 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 8.39 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.16 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 -- Dielectric Strength kV/mm ASTM D116 -- Electrical Resistivity Wcm @ R.T. ASTM D1829 7 x 10-3
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