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Boron Carbide vs. CVD Diamond

Both boron carbide 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 (7, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 240 to 460
1050
Fracture Toughness, MPa-m1/2 2.5 to 3.5
5.5
Poisson's Ratio 0.17 to 0.19
0.1
Tensile Strength: Ultimate (UTS), MPa 350
750

Thermal Properties

Specific Heat Capacity, J/kg-K 950
500
Thermal Conductivity, W/m-K 31 to 90
1900
Thermal Expansion, µm/m-K 4.5 to 5.6
1.0

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.4
5.7
Electrical Resistivity Order of Magnitude, 10x Ω-m 0 to 11
13

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.7
3.5

Common Calculations

Stiffness to Weight: Axial, points 63 to 100
170
Stiffness to Weight: Bending, points 91 to 100
96
Strength to Weight: Axial, points 37 to 47
59
Strength to Weight: Bending, points 42 to 53
52
Thermal Diffusivity, mm2/s 16 to 38
1080
Thermal Shock Resistance, points 9.7 to 20
51