Silicon Carbide

Silicon carbide (SiC) is one of the hardest technical ceramics available. For many years it was second only to diamond on the Mohs scale, and to date, sintered silicon carbide remains both a competitive and supplementary material for abrasive synthetic diamonds. Combined with its high thermal conductivity and superb corrosion resistant properties, silicon carbide ceramics are workhorse materials for challenging application areas.


At International Syalons, we offer high-performance silicon carbide ceramics via reaction bonding and sintering. Each manufacturing technique yields a precision zero-porosity ceramic with exceptional resistance to chemical attack and good high-temperature properties. These result from a robust atomic structure with carbon and silicon forming a strong tetrahedral lattice. The advantages of this include:

  • Unmatched hardness (2600 Kg/mm2)
  • Superior thermal conductivity (150 W/(mK))
  • Moderate thermal shock resistance (ΔT = 400°C)
  • Good flexural strength at high temperatures (450 MPa at 1000°C)

Sintered silicon carbide is engineered via conventional means, using non-oxide sintering aids and high-temperature forming process in inert atmospheres. Reaction bonding differs in that additional silicon is made to infiltrate the green body to form additional SiC grains that bond with the primary ceramic. The latter is typically used to increase thermal shock resistance.

Explore our silicon carbide products below where you will find full specifications and a table detailing comprehensive behaviours in acids and alkalis. If you would like to learn about specific SiC components, or the industries that we serve, just contact a member of the International Syalons team today.


 

Sycarb 10

The table below lists typical mechanical, thermal and electrical property data for Sycarb 10.

Physical property data for Sycarb 10

Property Value Units
Composition SSiC -
Density 3.15 g/cc
Porosity 0 %
3 point Modulus of Rupture 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
450 MPa
3 point Modulus of Rupture 1000°C 450 MPa
Weibull Modulus 12 -
Compressive Strength 3500 MPa
Young's Modulus of Elasticity 410 GPa
Poisson's Ratio 0.21 -
Hardness (Vickers Hv50) 25.50 (2600) GPa (Kg/mm2)
Fracture Toughness K1C 4.0 MPa m½
Thermal Expansion Coefficient (0-1200°C) 4.4X10-6 K-1
Thermal Conductivity 150 W/(mK)
Thermal Shock Resistance 350 ΔT°C quenched in cold water
Maximum Use Temperature 1400 °C
RT Electrical Resistivity 104 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.


Sycarb 20

The table below lists typical mechanical, thermal and electrical property data for Sycarb 20.

Physical property data for Sycarb 20

Property Value Units
Composition SiSiC -
Density 3.10 g/cc
Porosity 0 %
3 point Modulus of Rupture 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
420 MPa
3 point Modulus of Rupture 1000°C 420 MPa
Weibull Modulus 15 -
Compressive Strength 2600 MPa
Young's Modulus of Elasticity 400 GPa
Poisson's Ratio 0.20 -
Hardness (Vickers Hv50) 23.54 (2400) GPa (Kg/mm2)
Fracture Toughness K1C 4.0 MPa m½
Thermal Expansion Coefficient (0-1200°C) 4.3X10-6 K-1
Thermal Conductivity 110 W/m/K
Thermal Shock Resistance 400 ΔT°C quenched in cold water
Maximum Use Temperature 1400 °C
RT Electrical Resistivity 102 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.

Download the Sycarb 20 Property Data Sheet PDF (0.09 Mb).


Sycarb Corrosion Behaviour

In addition to this outstanding property data, Sycarb also has excellent resistance to corrosion, often required for applications in the chemical and process industries.

The table below show the corrosion resistant behaviour of Sycarb in various acids and alkalis.

Sycarb corrosion behaviour in acids and alkalis.

Acid/Alkali Conc. % Temp. Exposure time / hrs Reaction
Acetic Acid 100 Boiling 100 None
Benzoic Acid 100 Boiling 100 None
Formic Acid 100 Boiling 100 None
Hydrochloric Acid 33 Boiling 100 None
Hydrofluric Acid 100 Boiling 100 None
Nitric Acid 69 Boiling 100 None
Phosphoric Acid 100 Boiling 100 None
Sulphuric Acid 98 Boiling 100 None
Ammonium Chloride 98 Boiling 100 None
Potassium Chloride 100 Boiling 100 None
Sodium Chloride 100 Boiling 100 None
Sodium hydroxide 50 Boiling 100 None

Typical corrosion data obtained under test conditions. The values given only apply to the test bodies on which they were determined, and therfore can only be recommended values. See our disclaimer.

The successful integration of advanced technical ceramics into engineering systems requires close collaboration between you, the end-user, and ourselves, the material suppliers. Please contact our Technical Department to discuss your requirments in detail and assist in exploiting the significant advantages which 0ur advanced ceramics offer.

In addition, see our resources section for guides on designing with ceramics and more property data comparing Sycarb with other engineering ceramics. For a comparison of the physical properties of all our materials see our Material Properties Datasheet.

Silicon Carbide Seals