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Boron Carbide vs. Aluminum Nitride

Both boron carbide and aluminum nitride are non-oxide engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1710 to 2200
2100
Elastic (Young's, Tensile) Modulus, GPa 240 to 460
330
Flexural Strength, MPa 170 to 410
190 to 400
Fracture Toughness, MPa-m1/2 2.5 to 3.5
2.9
Knoop Hardness 2600 to 3200
1160
Poisson's Ratio 0.17 to 0.19
0.21 to 0.31

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 2500
1380
Specific Heat Capacity, J/kg-K 950
780
Thermal Conductivity, W/m-K 31 to 90
80 to 190
Thermal Expansion, µm/m-K 4.5 to 5.6
4.2 to 5.4

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
6.9 to 28
Electrical Resistivity Order of Magnitude, 10x Ω-m 0 to 11
10 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.7
2.9 to 3.3

Common Calculations

Stiffness to Weight: Axial, points 63 to 100
55 to 63
Stiffness to Weight: Bending, points 91 to 100
69 to 80
Thermal Diffusivity, mm2/s 16 to 38
31 to 74