Silicon Carbide (SiC)

Silicon carbide is a non-oxide engineering ceramic material.

It has five 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) Strength2780 to 3680 MPa (400 to 530 x 103 psi)

Density3.0 to 3.2 g/cm3 (190 to 200 lb/ft3)

Elastic (Young's, Tensile) Modulus370 to 490 GPa (54 to 71 x 106 psi)

Electrical Resistivity Order of Magnitude1 to 4 10x Ω-m

Flexural Strength410 to 600 MPa (59 to 87 x 103 psi)

Fracture Toughness3.4 to 4.6 MPa-m1/2

Knoop Hardness2500 to 2900

Maximum Thermal Shock210 to 660 °C (410 to 1220 °F)

Poisson's Ratio0.15 to 0.21

Specific Heat Capacity670 to 1180 J/kg-K

Strength to Weight Ratio70 to 120 kN-m/kg

Tensile Strength: Ultimate (UTS)210 to 370 MPa (30 to 54 x 103 psi)

Thermal Conductivity120 to 170 W/m-K

Thermal Diffusivity56 to 60 m2/s

Thermal Expansion4.0 to 4.5 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

Properties of Silicon Carbide, Gary L. Harris (editor), 1995

Silicon Carbine Ceramics: Fundamental and Solid Reaction, Shigeyuki Somiya and Yoshizo Inomata (editors), 1991