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Silicon Carbide vs. Boron Carbide

Both silicon carbide and boron carbide are non-oxide engineering ceramics. There are 19 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2780 to 3900
1710 to 2200
Elastic (Young's, Tensile) Modulus, GPa 370 to 490
240 to 460
Flexural Strength, MPa 410 to 600
170 to 410
Fracture Toughness, MPa-m1/2 3.4 to 4.6
2.5 to 3.5
Knoop Hardness 2500 to 2900
2600 to 3200
Poisson's Ratio 0.14 to 0.21
0.17 to 0.19
Tensile Strength: Ultimate (UTS), MPa 210 to 370
350

Thermal Properties

Maximum Temperature: Mechanical, °C 500 to 1590
1000 to 2500
Specific Heat Capacity, J/kg-K 670 to 1180
950
Thermal Conductivity, W/m-K 120 to 170
31 to 90
Thermal Expansion, µm/m-K 4.0 to 4.5
4.5 to 5.6

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 0.94 to 3.3
0 to 11

Otherwise Unclassified Properties

Density, g/cm3 3.0 to 3.2
2.1 to 2.7

Common Calculations

Stiffness to Weight: Axial, points 69 to 84
63 to 100
Stiffness to Weight: Bending, points 79 to 82
91 to 100
Strength to Weight: Axial, points 18 to 34
37 to 47
Strength to Weight: Bending, points 24 to 38
42 to 53
Thermal Diffusivity, mm2/s 38 to 79
16 to 38
Thermal Shock Resistance, points 6.9 to 18
9.7 to 20