Si3n4 - Materials - Technical

Silicon Nitride (Si3N4)

BSO Products made from this material
Balls, Bearings

Silicon Nitride Ceramic is a dark grey ceramic having almost no porosity. It is a very hard but lightweight material with very good wear and abrasion resistance. It can withstand very high temperatures and maintains good hardness and strength above 1000oC. It has very good thermal shock resistance due to the low thermal expansion. Silicon Nitride can be used as an electrical insulator. It has excellent chemical resistance.

Physical Properties
PROPERTY UNIT VALUE
Volume Resistivity Ohm.cm 1012 to 1015 @ 25 oC
Compressive Strength MPa 2000 to 3500
Hardness kgf.mm2 1580 to 2200
Porosity % 0
Tensile Modulus GPa 280 to 310
Tensile Strength MPa 400 to 580
Shear Strength MPa 480 to 960
Flexural Strength MPa 830
Elastic Modulus GPa 310
Poisson’s Ratio   0.27
Density g/cm3 3.11 to 3.29
Thermal Conductivity W/m.oK 15 to 43 @ 20oC
Coefficient of Thermal Expansion 10-6/oC 3.3
Max. use temperature (unloaded) oC 1000 to 1500
Electrical Resistivity ohm/cm >106 @ 500oC
Electrical Resistivity ohm/cm 105 @ 2000oC

Chemical Resistance
Chemical Resistance
Acids (Concentrated) Fair
Acids (Dilute) Good
Alcohols Good
Alkalis Poor to Good
Greases and Oils Good
Halogens Good

Products made with Silicon Nitride can be found in the Bearing Shop Online Silicon Nitride online catalogue.


The Small Parts and Bearings has a much larger range of engineering supplies.

Hobby and Engineering Supplies lists a smaller range of products and only the most popular items in each range. They also list many additional hobby specific categories.

For the best range of miniature and small bearings please try the Miniature Bearings Australia website. Miniature Bearings Australia also list a large variety of miniature engineering products.



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