Silicon Carbide

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Silicon Carbides uniform hardness and density make it an extremely abrasion resistant material. Silicon carbide has excellent thermal shock resistance property because of its high thermal conductivity combined with high tensile strength and low thermal expansion. These properties, together with its excellent corrosion resistance and low coefficient of friction, make silicon carbide an excellent seal face material.
NTB manufactures α sintered silicon carbide. This material, made by sintering, has the advantage that it does not contain any free silicon. This provides it with outstanding corrosion resistance. The resultant material does have some porosity, but the pores are isolated individual pores so the material is impermeable.
A range of silicon carbide materials is available to the mechanical seal design engineer, and their use, both as the counter face and seal face, is growing. Each of these materials offers certain common advantages as a seal material and these include:
·         Low Specific gravity
·         Excellent abrasion resistance
·         Good thermal shock resistance
·         Extremely high hardness
·         High Thermal Conductivity
·         Low Thermal Expansion
·         Good chemical resistance
·         Ability to withstand high temperature
Specification of Alfa Sintered Silicon Carbide
PARAMETER
Units
Alfa Sic
Density
Gm/cc
3.10
Crystal Size
Microns
5
Water Absorption
%
0
Flexural Strength
(MOR) 20°C
Mpa
470
Colour
-----
BLACK
Elastic Modulus
20°C
Gpa
405
Compressive Strength 20°C
Mpa
3250
Hardness
R45N
25
Tensile Strength 25°C
Mpa
--
Fracture Toughness KIC
Mpa m1/2
4
Thermal Conductivity 20°
W/m°K
150
Coefficient of thermal Expansion 25-1000°C
1x10-6/°C
4.4
Specific Heat 100°C
J/kg K
800
Maximum Use Temperature
°C
1600