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Junty > Material > Silicon Carbide
Silicon Carbide
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.
Parameter Unit RB SiC SSiC
Density g/cm3 3.0 - 3.05 3.1
Free Silicon Content - 12% -
Crystal Size μm 8 - 20 5 - 7
Hardness Rockwell HRA 90 HRA 93
Compressive Strength MPa 2700 3000
Flexural Strength MPa 400 400
Fracture Toughness MPa 4.3 4.5
Elastic Modulus GPa 390 410
Poisson's Ratio - 0.15 0.15
Coefficient of Thermal Expansion 1 x 10-6 / K 4.3 4.3