Boron Carbide (B4C)

Boron carbide is a non-oxide engineering ceramic material.

It has three common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Compressive (Crushing) Strength1710 to 2200 MPa (250 to 320 x 103 psi)

Density2.1 to 2.7 g/cm3 (130 to 170 lb/ft3)

Dielectric Constant (Relative Permittivity) At 1 MHz6.4

Elastic (Young's, Tensile) Modulus240 to 460 GPa (35 to 67 x 106 psi)

Electrical Resistivity Order of Magnitude0 to 11 10x Ω-m

Flexural Strength170 to 410 MPa (25 to 59 x 103 psi)

Fracture Toughness2.5 to 3.5 MPa-m1/2

Knoop Hardness2600 to 3200

Poisson's Ratio0.17 to 0.18

Specific Heat Capacity950 J/kg-K

Strength to Weight Ratio170 to 130 kN-m/kg

Tensile Strength: Ultimate (UTS)350 MPa (51 x 103 psi)

Thermal Conductivity31 to 90 W/m-K

Thermal Diffusivity12 to 16 m2/s

Thermal Expansion4.5 to 5.6 µm/m-K

The length of each bar compares the given value to the highest value in the database.

Further Reading

Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996

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