Ferro-Ceramic Grinding Inc. machines over 15 different materials
Silicon Nitride (Si3N4)
Silicon Nitride Properties
Silicon Nitride (Si 3 N 4 ) Silicon Nitride has the strongest covalent bond properties next to silicon carbide.
Silicon Nitride Properties
Silicon Nitride has the strongest covalent bond properties next to silicon carbide. It is used as a high temperature structural ceramic due to superior heat resistance, strength, and hardness. The wear and corrosion resistance are excellent. There are various types available (Sintered, CVD, HP) for different purposes.
Main applications include heat exchangers, rotors, nozzles, bearings, valves, chemical plant parts, engine components, and armor.
| Properties | Units | Test | Value |
|---|---|---|---|
| Physical | |||
| Chemical Formula | - | - | Si3N4 |
| Density, r | g/cm3 | ASTM C20 | 3.31 |
| Color | - | - | dark gray |
| Crystal Structure | - | - | hexagonal (a & b) |
| Water Absorption | % @R.T. | ASTM C373 | 0.0 |
| Hardness | Moh's | - | 9 |
| Hardness | knoop (kg/mm2) | Knoop 100g | 2200 |
| Mechanical | |||
| Compressive Strength | MPa @ R.T. | ASTM C773 | 689-2760 |
| Tensile Strength | MPa @ R.T. | ACMA Test #4 | 360-434 |
| Modulus of Elasticity (Young's Mod.) | GPa | ASTM C848 | 317 |
| Flexural Strength (MOR) | MPa @ R.T. | ASTM F417 | 679-896 |
| Poisson's Ratio, u | ASTM C818 | 0.23 | |
| Fracture Toughness, KIc | MPa x m1/2 | Notched Beam Test | 5.0-8.0 |
| Thermal | |||
| Max. Use Temperature (* denotes inert atm.) | ºC | No load cond. | 1500 |
| Thermal Shock Resistance | DT (ºC) | Quenching | 750 |
| Thermal Conductivity | W/m-K @ R.T. | ASTM C408 | 27 |
| Coefficient of Linear Thermal Expansion, al | mm/m-ºC (~25ºC through ±1000ºC) | ASTM C372 | 3.4 |
| Specific Heat, cp | cal/g-ºC @ R.T. | ASTM C351 | 0.17 |
| Electrical | |||
| Dielectric Constant | 1MHz @ R.T. | ASTM D150 | 7.0 |
| Dielectric Strength | kV/mm | ASTM D116 | 17.7 |
| Electrical Resistivity | Wcm @ R.T. | ASTM D1829 | 1013 |