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