Silicon Nitride
Silicon nitride（Si₃N₄）: an inorganic material that is superhard, heat-resistant, and resistant to thermal shock. It is wear-resistant, self-lubricating, acid and alkali resistant, with excellent electrical insulation and low optical loss, making it a key material for high-end mechanical, electronic and photonic chips.
| Material Grades | Characteristics | Density (g/cm3) |
Rockwell hardness (HRA) |
Elastic modulus (GPa) |
Bending strength (MPa) |
Compressive strength (MPa) |
Thermal conductivity (25℃) {W/(m.k)} |
Coefficient of thermal expansion (1x10-6/℃) (20-1000℃) |
Fracture toughness |
| Silicon nitride (atmospheric pressure) | Si2N4 (pressureless sintering) | 3.18 | HV50:1400 | 300 | 600 | 3000 | 30 | 3 | 5-6 |
| Silicon nitride (hot pressed) | Si2N4 (Hot pressed) | 3.2 | HV50:1700 | 300 | 800 | 3000 | 50 | 3 | 6-7 |
The information provided in this table is for general material performance reference only. Customers should recognize that the exact properties of the material may vary depending on product configuration, although values for most properties can be closely controlled where specified. Nothing in this document shall be construed as providing absolute engineering data or constituting a warranty or representation. Please contact Dongxin for cost-effective design, development and manufacturing support.
Domestic silicon carbide sealing ring leading industry
Contact Us
Beiyang Industrial Area, Shangpan Town, Linhai City, Zhejiang, China
© 2025 Dongxin New Material Technology
Hotline:+86-576-85733869
Time:8:00 - 24:00