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SiAlON vs. CVD Diamond

Both SiAlON and CVD diamond are 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 SiAlON and the bottom bar is CVD diamond.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 290
1050
Fracture Toughness, MPa-m1/2 6.3
5.5
Poisson's Ratio 0.23
0.1
Tensile Strength: Ultimate (UTS), MPa 190
750

Thermal Properties

Specific Heat Capacity, J/kg-K 880
500
Thermal Conductivity, W/m-K 19
1900
Thermal Expansion, µm/m-K 3.6
1.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 9.3
5.7
Electrical Resistivity Order of Magnitude, 10x Ω-m 14
13

Otherwise Unclassified Properties

Density, g/cm3 3.3
3.5

Common Calculations

Stiffness to Weight: Axial, points 50
170
Stiffness to Weight: Bending, points 67
96
Strength to Weight: Axial, points 16
59
Strength to Weight: Bending, points 22
52
Thermal Diffusivity, mm2/s 6.4
1080
Thermal Shock Resistance, points 13
51