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Silicon Carbide - Reaction Bonded ( SiC )

Material Information

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Rod Sheet Tube
Rod Sheet Tube

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Common Brand Names:
REFEL F®
 
General Description:  

To manufacture Reaction Bonded Silicon Carbide (RBSC), Silicon is infiltrated into a pre-formed silicon carbide/carbon powder green body which is then fired. This gives rise to around 10% free silicon, which fills the pores. The resulting microstructure has low porosity and a very fine grain. Shaping is normally carried out before firing, but the fired compact can be diamond ground to around 0.01mm tolerance. However, it is difficult to machine after firing. The material has high strength up to 1350C which results in its use as high temperature gas turbine components. The high hardness (harder than tungsten carbide) means that it is used extensively for bearings and seals. The high thermal conductivity combined with low thermal expansion leads to good thermal shock resistance. RBSC can tolerate a wider range of acids and alkalis than either tungsten carbide or alumina. Its oxidation resistance helps to give long service life in furnace applications.

   

Chemical Resistance

Acids - concentrated Good
Acids - dilute Good
Alkalis Fair
Halogens Fair
Metals Fair

Electrical Properties

Volume resistivity @25C ( Ohmcm ) 102-103

Mechanical Properties

Compressive strength ( MPa ) 2000-3500
Hardness - Vickers ( kgf mm-2 ) 2500-3500
Tensile modulus ( GPa ) 410

Physical Properties

Apparent porosity ( % ) 0
Density ( g cm-3 ) 3.10

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 4.3-4.6
Specific heat @25C ( J K-1 kg-1 ) 1100
Thermal conductivity @20C ( W m-1 K-1 ) 150-200
Upper continuous use temperature ( C ) 1350
All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.

Buy Silicon Carbide - Reaction Bonded on-line

We stock and supply the following standard forms:
Rod Sheet Tube
Rod Sheet Tube

Choose a form to search our on-line catalog  

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