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Silicon Nitride - Reaction Bonded ( Si3N4  )

Material Information

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

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Common Brand Names:
NITRASIL® R
 
General Description:  

Reaction Bonded Silicon Nitride is produced by nitriding compacted Silicon powder. This production route is considerably more cost-effective than hot-pressing. Very complex and accurate shapes can be produced, which hold their shape during firing. After firing, as for Hot Pressed Silicon Nitride, it can be diamond ground to tolerances as close as 0.01mm. Although not as strong as Hot Pressed Silicon Nitride, its strength is held up to 1400C, with long term oxidation resistance up to 1150C. The thermal and electrical properties of the two forms of Silicon Nitride are however very similar. This form finds use as supports in situations of continuous temperature cycling within ranges of up to 1000C, as well as for gas turbine components. Reaction Bonded Silicon Nitride is resistant to a wide range of chemicals and molten metals.

Silicon Nitride spheres have found use as bearings in the automotive industry, as they have high wear resistance and have a coefficient of friction and a density much lower than steel.

   

Chemical Resistance

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

Electrical Properties

Dielectric constant 10
Volume resistivity @25C ( Ohmcm ) >107

Mechanical Properties

Compressive strength ( MPa ) 550-650
Hardness - Vickers ( kgf mm-2 ) 800-1000
Shear strength ( MPa ) 190-240
Tensile modulus ( GPa ) 170-220

Physical Properties

Apparent porosity ( % ) 15-23
Density ( g cm-3 ) 2.4

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 3.3
Specific heat @25C ( J K-1 kg-1 ) 690
Thermal conductivity @20C ( W m-1 K-1 ) 10-16
Upper continuous use temperature ( C ) 1200-1500

Buy Silicon Nitride - Reaction Bonded on-line

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

Choose a form to search our on-line catalog  

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