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SiAlON vs. Silicon Nitride

Both SiAlON and silicon nitride are non-oxide engineering ceramics. There are 17 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 SiAlON and the bottom bar is silicon nitride.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2620
600 to 2950
Elastic (Young's, Tensile) Modulus, GPa 290
140 to 310
Flexural Strength, MPa 680
130 to 810
Fracture Toughness, MPa-m1/2 6.3
3.1 to 6.2
Poisson's Ratio 0.23
0.24 to 0.27

Thermal Properties

Maximum Temperature: Mechanical, °C 1200
1000 to 1330
Maximum Thermal Shock, °C 300
290 to 750
Specific Heat Capacity, J/kg-K 880
720 to 800
Thermal Conductivity, W/m-K 19
12 to 31
Thermal Expansion, µm/m-K 3.6
2.5 to 3.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 9.3
8.0 to 10
Dielectric Strength (Breakdown Potential), kV/mm 8.3
18
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
11 to 12

Otherwise Unclassified Properties

Density, g/cm3 3.3
2.2 to 3.4

Common Calculations

Stiffness to Weight: Axial, points 50
34 to 53
Stiffness to Weight: Bending, points 67
65 to 78
Thermal Diffusivity, mm2/s 6.4
7.5 to 13