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SiAlON vs. Aluminum Nitride

Both SiAlON and aluminum nitride 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 SiAlON and the bottom bar is aluminum nitride.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 3.3
2.9 to 3.3

Common Calculations

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