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HobbyParts Si3n4 - Materials - Technical Information
Silicon Nitride (Si3N4)
MBA 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 MBA online catalogue.
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