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Machinable Glass-ceramic vs. Silicon Nitride

Machinable glass-ceramic belongs to the glass and glass-ceramics classification, while silicon nitride belongs to the non-oxide engineering ceramics. There are 16 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 310
600 to 2950
Elastic (Young's, Tensile) Modulus, GPa 67
140 to 310
Flexural Strength, MPa 96
130 to 810
Fracture Toughness, MPa-m1/2 2.5
3.1 to 6.2
Poisson's Ratio 0.29
0.24 to 0.27

Thermal Properties

Maximum Temperature: Mechanical, °C 760
1000 to 1330
Specific Heat Capacity, J/kg-K 790
720 to 800
Thermal Conductivity, W/m-K 1.2
12 to 31
Thermal Expansion, µm/m-K 21
2.5 to 3.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
8.0 to 10
Dielectric Strength (Breakdown Potential), kV/mm 27
18
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
11 to 12

Otherwise Unclassified Properties

Density, g/cm3 2.7
2.2 to 3.4

Common Calculations

Stiffness to Weight: Axial, points 14
34 to 53
Stiffness to Weight: Bending, points 51
65 to 78
Thermal Diffusivity, mm2/s 0.56
7.5 to 13