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CVD Diamond vs. Low Expansion Glass-ceramic

CVD diamond belongs to the non-oxide engineering ceramics classification, while low expansion glass-ceramic belongs to the glass and glass-ceramics. There are 17 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 CVD diamond and the bottom bar is low expansion glass-ceramic.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 1050
83
Poisson's Ratio 0.1
0.22
Tensile Strength: Ultimate (UTS), MPa 750
53

Thermal Properties

Specific Heat Capacity, J/kg-K 500
800
Thermal Conductivity, W/m-K 1900
1.5
Thermal Expansion, µm/m-K 1.0
1.7

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 5.7
5.7
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
11

Otherwise Unclassified Properties

Density, g/cm3 3.5
2.4
Light Transmission Range, µm 0.22 to 100
0.5 to 2.7
Refractive Index 2.4
1.5

Common Calculations

Stiffness to Weight: Axial, points 170
19
Stiffness to Weight: Bending, points 96
59
Strength to Weight: Axial, points 59
6.1
Strength to Weight: Bending, points 52
13
Thermal Diffusivity, mm2/s 1080
0.76
Thermal Shock Resistance, points 51
28