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Hexagonal Boron Nitride vs. Silicon Nitride

Both hexagonal boron nitride 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 (5, in this case) are not shown.

For each property being compared, the top bar is hexagonal boron nitride and the bottom bar is silicon nitride.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 21 to 250
600 to 2950
Elastic (Young's, Tensile) Modulus, GPa 14 to 60
140 to 310
Flexural Strength, MPa 18 to 140
130 to 810
Poisson's Ratio 0.11
0.24 to 0.27

Thermal Properties

Maximum Temperature: Mechanical, °C 1030 to 2350
1000 to 1330
Specific Heat Capacity, J/kg-K 840 to 1610
720 to 800
Thermal Conductivity, W/m-K 29 to 96
12 to 31
Thermal Expansion, µm/m-K 0.54 to 18
2.5 to 3.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 4.0 to 4.4
8.0 to 10
Dielectric Strength (Breakdown Potential), kV/mm 61 to 200
18
Electrical Resistivity Order of Magnitude, 10x Ω-m 13 to 15
11 to 12

Otherwise Unclassified Properties

Density, g/cm3 1.9 to 2.1
2.2 to 3.4

Common Calculations

Stiffness to Weight: Axial, points 4.1 to 18
34 to 53
Stiffness to Weight: Bending, points 42 to 69
65 to 78
Thermal Diffusivity, mm2/s 9.9 to 34
7.5 to 13