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Silicon Nitride vs. Glass-bonded Mica

Silicon nitride belongs to the non-oxide engineering ceramics classification, while glass-bonded mica belongs to the glass and glass-ceramics. There are 15 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is silicon nitride and the bottom bar is glass-bonded mica.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 600 to 2950
270
Elastic (Young's, Tensile) Modulus, GPa 140 to 310
71
Flexural Strength, MPa 130 to 810
79

Thermal Properties

Maximum Temperature: Mechanical, °C 1000 to 1330
450
Maximum Thermal Shock, °C 290 to 750
110
Specific Heat Capacity, J/kg-K 720 to 800
500
Thermal Conductivity, W/m-K 12 to 31
23
Thermal Expansion, µm/m-K 2.5 to 3.2
6.7

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 8.0 to 10
6.8
Dielectric Strength (Breakdown Potential), kV/mm 18
20
Electrical Resistivity Order of Magnitude, 10x Ω-m 11 to 12
10

Otherwise Unclassified Properties

Density, g/cm3 2.2 to 3.4
2.6

Common Calculations

Stiffness to Weight: Axial, points 34 to 53
15
Stiffness to Weight: Bending, points 65 to 78
52
Thermal Diffusivity, mm2/s 7.5 to 13
18