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Aluminum Nitride vs. Alumina

Aluminum nitride belongs to the non-oxide engineering ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2100
1920 to 2750
Elastic (Young's, Tensile) Modulus, GPa 330
220 to 370
Flexural Strength, MPa 190 to 400
260 to 430
Fracture Toughness, MPa-m1/2 2.9
3.7 to 7.2
Knoop Hardness 1160
960 to 1660
Poisson's Ratio 0.21 to 0.31
0.22 to 0.24

Thermal Properties

Maximum Temperature: Mechanical, °C 1380
650 to 1730
Maximum Thermal Shock, °C 220
200 to 300
Specific Heat Capacity, J/kg-K 780
870 to 940
Thermal Conductivity, W/m-K 80 to 190
14 to 30
Thermal Expansion, µm/m-K 4.2 to 5.4
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.9 to 28
7.8 to 11
Dielectric Strength (Breakdown Potential), kV/mm 15 to 56
8.9 to 12
Electrical Dissipation At 1 Hz 0.0019
0.00031 to 0.0011
Electrical Dissipation At 1 MHz 0.00020 to 0.0010
0.00049 to 0.0013
Electrical Resistivity Order of Magnitude, 10x Ω-m 10 to 12
6.2 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.9 to 3.3
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 55 to 63
35 to 53
Stiffness to Weight: Bending, points 69 to 80
57 to 62
Thermal Diffusivity, mm2/s 31 to 74
3.7 to 10