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Silicon Nitride vs. Fused Silica

Silicon nitride belongs to the non-oxide engineering ceramics classification, while fused silica belongs to the glass and glass-ceramics. There are 15 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is silicon nitride and the bottom bar is fused silica.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 600 to 2950
1100
Elastic (Young's, Tensile) Modulus, GPa 140 to 310
73
Flexural Strength, MPa 130 to 810
67
Poisson's Ratio 0.24 to 0.27
0.17

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 1330
1080
Specific Heat Capacity, J/kg-K 720 to 800
720
Thermal Conductivity, W/m-K 12 to 31
1.4
Thermal Expansion, µm/m-K 2.5 to 3.2
0.5

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 8.0 to 10
3.8
Dielectric Strength (Breakdown Potential), kV/mm 18
30
Electrical Resistivity Order of Magnitude, 10x Ω-m 11 to 12
14

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 3.4
2.2

Common Calculations

Stiffness to Weight: Axial, points 34 to 53
18
Stiffness to Weight: Bending, points 65 to 78
63
Thermal Diffusivity, mm2/s 7.5 to 13
0.85