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Silicon Carbide

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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

 

 


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