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Aluminum Nitride vs. SiAlON

Both aluminum nitride and SiAlON are non-oxide engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2100
2620
Elastic (Young's, Tensile) Modulus, GPa 330
290
Flexural Strength, MPa 190 to 400
680
Fracture Toughness, MPa-m1/2 2.9
6.3
Knoop Hardness 1160
1700
Poisson's Ratio 0.21 to 0.31
0.23

Thermal Properties

Maximum Temperature: Mechanical, °C 1380
1200
Maximum Thermal Shock, °C 220
300
Specific Heat Capacity, J/kg-K 780
880
Thermal Conductivity, W/m-K 80 to 190
19
Thermal Expansion, µm/m-K 4.2 to 5.4
3.6

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.9 to 28
9.3
Dielectric Strength (Breakdown Potential), kV/mm 15 to 56
8.3
Electrical Resistivity Order of Magnitude, 10x Ω-m 10 to 12
14

Otherwise Unclassified Properties

Density, g/cm3 2.9 to 3.3
3.3

Common Calculations

Stiffness to Weight: Axial, points 55 to 63
50
Stiffness to Weight: Bending, points 69 to 80
67
Thermal Diffusivity, mm2/s 31 to 74
6.4