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Silicon Carbide vs. Silicon Nitride

Both silicon carbide and silicon nitride are non-oxide engineering ceramics. There are 15 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 silicon carbide and the bottom bar is silicon nitride.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 2780 to 3900
600 to 2950
Elastic (Young's, Tensile) Modulus, GPa 370 to 490
140 to 310
Flexural Strength, MPa 410 to 600
130 to 810
Fracture Toughness, MPa-m1/2 3.4 to 4.6
3.1 to 6.2
Poisson's Ratio 0.14 to 0.21
0.24 to 0.27

Thermal Properties

Maximum Temperature: Mechanical, °C 500 to 1590
1000 to 1330
Maximum Thermal Shock, °C 210 to 660
290 to 750
Specific Heat Capacity, J/kg-K 670 to 1180
720 to 800
Thermal Conductivity, W/m-K 120 to 170
12 to 31
Thermal Expansion, µm/m-K 4.0 to 4.5
2.5 to 3.2

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 0.94 to 3.3
11 to 12

Otherwise Unclassified Properties

Density, g/cm3 3.0 to 3.2
2.2 to 3.4

Common Calculations

Stiffness to Weight: Axial, points 69 to 84
34 to 53
Stiffness to Weight: Bending, points 79 to 82
65 to 78
Thermal Diffusivity, mm2/s 38 to 79
7.5 to 13