Silicon Carbide (SiC) is one of the most popular high performance tribo-materials, which has been commercially available for more than twenty-five years. Its features include:
· Excellent abrasion and wear resistance
· Excellent corrosion resistance
· Low coefficient of friction
· Low coefficient of thermal expansion
· High thermal conductivity
· Hardness greater than Tungsten Carbide

Different grades of Silicon Carbide are available as following:
· Reaction Bonded Silicon Carbide (RB SiC) – a very economical material which gives excellent wear characteristics, as well as good chemical resistance.
· Sintered Silicon Carbide (SSiC) – the absence of free silicon makes it most resistant to chemically-aggressive fluids, and ideal for high temperature applications.
· Graphite-Loaded Silicon Carbide – this is a composite of silicon carbide and free graphite. Graphite is added to RB SiC (RB SiC + C) or SSiC (SSiC + C), to improve tribological behavior by enhanced lubricity.

ParameterUnitRB SiCSSiC
Densityg/cm33.0-3.053.10 
Free Silicon Content%12%
Crystal Sizeμm 8-205-7
HardnessRockwellHRA 90>HRA 93
Compressive StrengthMpa27003000
psi391,500 435,000 
Flexural StrengthMpa400400
psi58,000 58,000 
Fracture ToughnessMpa.m1/24.34.5
Elastic ModulousGpa390410
psi57×10659×106
Poisson’s Ratio/0.150.15
Thermal Expansion Coefficient1×10-6/K4.34.3
ParameterUnitRB SiC + CSSiC + C
Density g/cm32.70 2.85 
Free Silicon Content%
Crystal Sizeμm 
HardnessRockwellHRA 82HRA 85
Compressive StrengthMpa15002000
psi217,500 290,000 
Flexural StrengthMpa200300
psi29,000 435,000 
Fracture ToughnessMpa.m1/2
Elastic ModulousGpa250320
psi36.3×10646.4×106
Poisson’s Ratio/
Thermal Expansion Coefficient1×10-6/K

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