Ferro-Ceramic Grinding Inc. machines over 15 different materials
Boron Nitride
Boron nitride (BN) is a synthetic material made using a hot pressing process and comes as a lubricious white solid. Below is a chart of boron nitride properties.
Boron Nitride Properties
Boron nitride machining is just one of the many services that Ferro-Ceramic provides. BN can be machined using standard carbide drills, as it’s one of the most rigid materials available—even harder than diamond material. Due to its crystal structure, BN is anisotropic electrically and mechanically—which means that its physical properties have different values depending on the measurement direction.
BN is also sometimes referred to as white graphite thanks to its hexagonal structure and lubricious characteristics, which are similar to graphite. However, unlike graphite, BN is a quality electrical insulator with higher oxidation. After boron nitride machining, the material is ready to use without additional heat treatment or firing.
BN exhibits a high electrical resistance, low dielectric constant and loss tangent, low thermal expansion, chemical inertness, and good thermal shock resistance. There are several different purity levels for this material. All offer very high thermal conductivity and stability in inert and reducing atmospheres up to 2800°C and at 850°C in oxidizing environments.
There are various uses for BN, including:
- Vacuum components
- Low friction seals
- Various electronic parts
- Nuclear applications
- Plasma arc insulators.
If you’d like to learn more about boron nitride material or Ferro-Ceramic, contact our staff today with any questions you may have.
| Properties | Units | Test | Value | |
|---|---|---|---|---|
| Physical | ||||
| Chemical Formula | - | - | BN | |
| Density, r | g/cm3 | ASTM C20 | 2.28 | |
| Color | - | - | white | |
| Crystal Structure | - | - | hexagonal | |
| Water Absorption | % @R.T. | ASTM C373 | 0.0 - 1.0 | |
| Hardness | Moh's | - | 2 | |
| Hardness | knoop (kg/mm2) | Knoop 100g | 25-205 | |
| Mechanical | ||||
| Compressive Strength | MPa @ R.T. | ASTM C773 | 23.5 | |
| Tensile Strength | MPa @ R.T. | ACMA Test #4 | 2.41 (1000 ºC) | |
| Modulus of Elasticity (Young's Mod.) | GPa | ASTM C848 | 675 | |
| Flexural Strength (MOR) | MPa @ R.T. | ASTM F417 | 51.8 | |
| Poisson's Ratio, u | - | ASTM C818 | 0.05 | |
| Fracture Toughness, KIc | MPa x m1/2 | Notched Beam Test | 2.6 | |
| Thermal | ||||
| Max. Use Temperature (* denotes inert atm.) | ºC | No load cond. | 985 | |
| Thermal Shock Resistance | DT (ºC) | Quenching | > 1500 | |
| Thermal Conductivity | W/m-K @ R.T. | ASTM C408 | 20 | |
| Coefficient of Linear Thermal Expansion, al | mm/m-ºC (~25ºC through ±1000ºC) | ASTM C372 | 1.0-2.0 | |
| Specific Heat, cp | cal/g-ºC @ R.T. | ASTM C351 | 0.19 | |
| Electrical | ||||
| Dielectric Constant | 1MHz @ R.T. | ASTM D150 | 4.08 | |
| Dielectric Strength | kV/mm | ASTM D116 | 374 | |
| Electrical Resistivity | Wcm @ R.T. | ASTM D1829 | 1013 | |