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Graphite vs. Silicon Carbide

Both graphite and silicon carbide are non-oxide engineering ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is graphite and the bottom bar is silicon carbide.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 90
2780 to 3900
Elastic (Young's, Tensile) Modulus, GPa 21
370 to 490
Flexural Strength, MPa 80
410 to 600
Tensile Strength: Ultimate (UTS), MPa 18
210 to 370

Thermal Properties

Maximum Temperature: Mechanical, °C 220
500 to 1590
Thermal Conductivity, W/m-K 6.0
120 to 170
Thermal Expansion, µm/m-K 4.9
4.0 to 4.5

Otherwise Unclassified Properties

Density, g/cm3 1.8
3.0 to 3.2

Common Calculations

Stiffness to Weight: Axial, points 6.7
69 to 84
Stiffness to Weight: Bending, points 53
79 to 82
Strength to Weight: Axial, points 2.9
18 to 34
Strength to Weight: Bending, points 8.7
24 to 38
Thermal Shock Resistance, points 12
6.9 to 18