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Aluminum Nitride vs. Silicon Carbide

Both aluminum nitride and silicon carbide 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 aluminum nitride and the bottom bar is silicon carbide.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2100
2780 to 3900
Elastic (Young's, Tensile) Modulus, GPa 330
370 to 490
Flexural Strength, MPa 190 to 400
410 to 600
Fracture Toughness, MPa-m1/2 2.9
3.4 to 4.6
Knoop Hardness 1160
2500 to 2900
Poisson's Ratio 0.21 to 0.31
0.14 to 0.21

Thermal Properties

Maximum Temperature: Mechanical, °C 1380
500 to 1590
Maximum Thermal Shock, °C 220
210 to 660
Specific Heat Capacity, J/kg-K 780
670 to 1180
Thermal Conductivity, W/m-K 80 to 190
120 to 170
Thermal Expansion, µm/m-K 4.2 to 5.4
4.0 to 4.5

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 10 to 12
0.94 to 3.3

Otherwise Unclassified Properties

Density, g/cm3 2.9 to 3.3
3.0 to 3.2

Common Calculations

Stiffness to Weight: Axial, points 55 to 63
69 to 84
Stiffness to Weight: Bending, points 69 to 80
79 to 82
Thermal Diffusivity, mm2/s 31 to 74
38 to 79