Global Elements Solutions
Global Elements Solutions
Silicon nitride (Si₃N₄) is a covalent compound with high hardness, wear resistance, thermal stability, and chemical stability. It can withstand high temperatures, with a decomposition temperature of about 1900°C and a practical usage temperature up to 1400°C. It has excellent mechanical strength, with a bending strength exceeding 980 MPa, and can endure high-temperature thermal shock without cracking. Silicon nitride is highly resistant to most inorganic acids, many organic substances, and molten non-ferrous metals, and also exhibits excellent electrical insulation and optical transparency.
At GESmaterials, we supply Silicon Nitride (Si₃N₄), a high-performance ceramic known for its superior mechanical strength, low density, and excellent resistance to wear, corrosion, and thermal shock. Its unique characteristics make it indispensable in advanced engineering applications:
Precision Bearings
Si₃N₄ bearing balls are widely used in automobiles, aerospace systems, high-speed engines, and performance racing vehicles. Compared with steel bearings, ceramic bearings offer higher strength at elevated temperatures, lower friction, longer service life, and the ability to resist corrosive environments.
High-Temperature Components
Si₃N₄ is one of the few monolithic ceramics capable of withstanding severe thermal shock and steep temperature gradients. It has been evaluated and applied in demanding environments such as hydrogen-oxygen rocket engines, where extreme conditions quickly degrade conventional materials.
Corrosion-Resistant Engineering
Thanks to its chemical inertness, silicon nitride performs reliably in harsh environments where metals and other ceramics fail. It is increasingly used in industrial machinery, chemical processing equipment, and marine applications requiring long-term durability.
| Chemical Formula | Si3N4 |
|---|---|
| Mechanical | |
| Density | 3.26 g/cm3 |
| Hardness | 14 GPa |
| Modulus of Elasticity | 300 GPa |
| Flexural Strength | 800 MPa |
| Compressive Strength | 3000 MPa |
| Poisson’s Ratio | 0.28 |
| Fracture Toughness | 7 MPa m½ |
| Electrical | |
| Dielectric Strength | 13 ac V/mm |
| Dielectric Constant | 9.6 (@ 1 MHz) |
| Volume Resistivity | 10^14 ohm-cm |
| Thermal | |
| Coefficient of Thermal Expansion | 3.1 x 10^-6/°C |
| Thermal Conductivity | 17 W/(m*K) |
| Specific Heat | 0.65 x10^3 J/(Kg*K) |
| Shock Resistance | 800 °C Diff. |
| Maximum Working Temperature | 1300 °C |
We are dedicated to supplying high-quality, stable products, including refractory metals, deposition materials (sputtering target & evaporation materials), rare earth elements, permanent magnets, and advanced ceramic products.
E-mail：sales@gesmaterials.com
560 17th St, Oakland, CA 94612, USA
© Copyright – GESmaterials LLC , All Rights Reserved.
Please describe the product(s) for which you would like more information/quotation.Items marked with an asterisk(*) are required.
