SILICON NITRIDE TECHNICAL DATA
| Properties | Units | Test | Value | |||
| Physical | ||||||
| Chemical Formula | - | - | Si3N4 | |||
| Density, r | g/cm3 | ASTM C20 | 3.31 | |||
| Color | - | - | dark gray | |||
| Crystal Structure | - | - | hexagonal (alpha&beta) | |||
| Water Absorption | % @R.T. | ASTM C373 | 0.0 | |||
| Hardness | Mohs | - | 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 | |||