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Silicon Carbide

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Silicon carbide resists a wide range of chemicals. It is also the hardest of seal face materials, give it excellent abrasion resistance. Silicon carbide's high thermal conductivity and low coefficient of friction are essential for the effective sealing of volatile liquids and high pressure services. Reaction-bonded silicon carbide can be corroded by caustics and hydrofluoric acid. Self-sintered silicon carbide resists all chemicals.

Parameter

SSIC

RBSiC

Carbide SiC
Purity( % )

>97

>90

30%
Hardness( HRA )

90

90

85
Grain Size( um )

0.5-0.7

8-20

20-40
Density( g/cm3 )

3.06-3.15

>3.05

>2.65
Bend Strength( MPa )

400-580

350-450

200
Compressive Strength(MPa)

3900

>2500

1800
Fracture Toughness( MPA )

3.05-4.6

4.3

Elastic Modulus( GPa )

380-410

420

Thermal Conductivity(W/M.K)

102.6

35-110

125
Coefficient of heat Expansion( L/°C )

4.02x10-6

4.3x10-6

3x10-6
Poisson Ratio

0.14

0.15

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