Open here for our page navigation
Boron Nitride Ceramics
Boron Nitride, Regular or High Grade, is available as rods, bars, block and plate. Additionally Boron Nitride can be fabricated into many custom shapes.
Boron Nitride
High Grade
High Grade Boron Nitride is Hexagonal in structure. It is a diffusion bonded ceramic, which does not depend on a Boron Oxide binder for mechanical integrity.
Typical Properties:
Binder None
Maximum Use Temperature in Oxidizing Atmosphere 850oC
Maximum Use Temperature in Inert Atmosphere 3000oC
Specific Heat at 700oC 0.35 J/goC
Dielectric Strength 2000 V/mil
Pressing Direction Parallel
Volume Resistivity at RT > 1014 Ohm cm
Loss Tangent at 8.8 GHz 0.0012
Dielectric Constant at RT 4.0
Thermal Conductivity at 25oC 40.0 W/m/K
Thermal Conductivity at 1500oC 14.0 W/m/K
Thermal Expansion Coefficient RT to 1500oC 1.0 x10-6 in/in/oC
Flexural Strength at 25oC 2600 psi
Flexural Strength at 1500oC 6200 psi
Pressing Direction Perpendicular
Volume Resistivity at RT > 1015 Ohm cm
Loss Tangent at 8.8 GHz 0.0003
Dielectric Constant at RT 4.0
Thermal Conductivity at 25oC 65.0 W/m/K
Thermal Conductivity at 1500oC 22.0 W/m/K
Thermal Expansion Coefficient RT to 1500oC 0.3 x10-6 in/in/oC
Flexural Strength at 25oC 3100 psi
Flexural Strength at 1500oC 11000 psi
Percentage Open Porosity 12.57%
Density (minimum) 1.91 g/cc
Oxygen 0.3 - 0.4%
Carbon 0.01 - 0.03%
Calcium 0.03 - 0.05%
Other Impurities 0.05% maximum
Chemically, High Grade Boron Nitride is inert and not wetted by most molten materials such as glasses, metals, halide salts and many other reagents.
Mechanically, High Grade Boron Nitride has an increased strength as compared to temperature. This feature offers higher temperature performance to applications previously unobtainable with boron nitrides, which are boron oxide bonded.
Thermally, High Grade Boron Nitride has minimal thermal expansion; high thermal conductivity and an operating range approaching 3000oC. The thermal shock stability is excellent over a wide range of use temperatures.
Electronically, High Grade Boron Nitride is transparent to microwave energy. It has high Resistivity and high dielectric strength with a low loss tangent and dielectric constant.
Additionally High Grade Boron Nitride is non-toxic, easily machined and has no moisture pick-up and non-outgassing characteristics.
Boron Nitride
Regular Grade
Typical Properties:
Binder Boric Oxide
Binder Melting Point 550oC
Maximum Use Temperature in Oxidizing Atmosphere 850oC
Maximum Use Temperature in Inert Atmosphere 1800oC
Specific Heat at 700oC 1.610 J/goC
Hardness (Knoop) 15.51 - 24.19 kg/mm2
Dielectric Strength 2400 V/mil
Pressing Direction Parallel
Volume Resistivity at RT > 1014 Ohm cm
Loss Tangent at 8.8 GHz 0.0017
Dielectric Constant at RT 4.58
Thermal Conductivity at 25oC 30.13 W/m/K
Thermal Expansion Coefficient RT to 1500oC 11.85 x10-6 in/in/oC
Flexural Strength at 25oC 11000 psi
Flexural Strength at 1500oC 900 psi
Pressing Direction Perpendicular
Volume Resistivity at RT > 1015 Ohm cm
Loss Tangent at 8.8 GHz 0.0005
Dielectric Constant at RT 4.15
Thermal Conductivity at 25oC 33.71 W/m/K
Thermal Expansion Coefficient RT to 1500oC 3.12 x10-6 in/in/oC
Flexural Strength at 25oC 16400 psi
Flexural Strength at 1500oC 1380 psi
Percentage Open Porosity 2.84%
Density (minimum) 1.92 g/cc
Oxygen 3.0 - 5.0%
Carbon 0.01 - 0.03%
Calcium 0.1 - 0.2%
Boric Oxide 4.0 - 5.0%
Other Impurities 0.2% maximum