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Tungsten Carbide vs. CVD Diamond

Both tungsten carbide and CVD diamond are non-oxide engineering 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. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is tungsten carbide and the bottom bar is CVD diamond.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 630
1050
Fracture Toughness, MPa-m1/2 12
5.5
Poisson's Ratio 0.24
0.1
Tensile Strength: Ultimate (UTS), MPa 350
750

Thermal Properties

Specific Heat Capacity, J/kg-K 280
500
Thermal Conductivity, W/m-K 85
1900
Thermal Expansion, µm/m-K 5.4
1.0

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 0.75
13

Otherwise Unclassified Properties

Density, g/cm3 15
3.5

Common Calculations

Stiffness to Weight: Axial, points 24
170
Stiffness to Weight: Bending, points 20
96
Strength to Weight: Axial, points 6.6
59
Strength to Weight: Bending, points 7.5
52
Thermal Diffusivity, mm2/s 21
1080
Thermal Shock Resistance, points 7.2
51