Silicon Nitride - Hot-pressed ( Si₃N₄ )

Material Information

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General Description:
Hot pressing of Silicon Nitride produces a material of virtually zero porosity. This hard, gray ceramic is, however, still very lightweight. Silicon Nitride shows good resistance to wear and abrasion. It shows very little oxidation at elevated temperatures and high hardness and strength above 1000C. One of its main assets is its resistance to thermal shock, due to the low thermal expansion coefficient. This material can be diamond ground to precise tolerances. It is used in gas turbine situations, as diesel engine components and as an electrical insulator.

Chemical Resistance

Electrical Properties

Dielectric constant	10
Volume resistivity @25C ( Ohmcm )	10¹²-10¹⁵

Mechanical Properties

Physical Properties

Apparent porosity ( % )	0
Density ( g cm^-³ )	3.11

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10^-⁶ K^-¹ )	3.3
Specific heat @25C ( J K^-¹ kg^-¹ )	680-800
Sublimation point ( C )	1900
Thermal conductivity @20C ( W m^-¹ K^-¹ )	15-43
Upper continuous use temperature ( C )	1100-1650

We stock and supply the following standard forms:

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