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Silicon Carbide

Sintered silicon Carbide (SiC) and reaction bonded silicon carbide combine excellent corrosion resistance with extreme hardness and high thermal conductivity.

Silicon Carbide sealsSilicon carbide probably has the best resistance to corrosion in acids and alkalis of all advanced ceramic materials. It also has extreme hardness and high thermal conductivity and outstanding mechanical properties up to 1400°C.

Silicon carbide ceramics have excellent wear resistance and are widely used as mechanical seals. The corrosion resistance ensures wide use in the Chemical Industry.

ISN offer 2 grades of silicon carbide, Sycarb 10, a sintered silicon carbide and Sycarb 20, a reaction bonded grade.

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.

Download the Sycarb 10 Property Data Sheet PDF (0.08 Mb).

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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).

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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.

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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.