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Hexagonal Boron Nitride (BN)

Hexagonal boron nitride is a non-oxide engineering ceramic. It can have a moderately low density among the non-oxide engineering ceramics in the database.

The properties of hexagonal boron nitride include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare hexagonal boron nitride to other non-oxide engineering ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Thermal Properties

Maximum Temperature: Corrosion

1140 to 2800 °C 2080 to 5070 °F

Maximum Temperature: Mechanical

1030 to 2350 °C 1880 to 4260 °F

Specific Heat Capacity

840 to 1610 J/kg-K 0.2 to 0.38 BTU/lb-°F

Thermal Conductivity

29 to 96 W/m-K 17 to 56 BTU/h-ft-°F

Thermal Expansion

0.54 to 18 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

4.0 to 4.4

Dielectric Strength (Breakdown Potential)

61 to 200 kV/mm 2.4 to 7.8 V/mil

Electrical Dissipation At 1 Hz

0.0017

Electrical Dissipation At 1 MHz

0.00075 to 0.0018

Electrical Resistivity Order of Magnitude

13 to 15 10x Ω-m

Other Material Properties

Compressive (Crushing) Strength

21 to 250 MPa 3.0 to 37 x 103 psi

Density

1.9 to 2.1 g/cm3 120 to 130 lb/ft3

Elastic (Young's, Tensile) Modulus

14 to 60 GPa 2.0 to 8.8 x 106 psi

Flexural Strength

18 to 140 MPa 2.5 to 20 x 103 psi

Poisson's Ratio

0.11

Common Calculations

Stiffness to Weight: Axial

4.1 to 18 points

Stiffness to Weight: Bending

42 to 69 points

Thermal Diffusivity

9.9 to 34 m2/s

Followup Questions

Further Reading

Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications, Hugh O. Pierson, 1996

Ceramics and Composites: Processing Methods, Narottam P. Bansal and Aldo R. Boccaccini (editors), 2012

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials

Springer Handbook of Condensed Matter and Materials Data, W. Martienssen and H. Warlimont (editors), 2005

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010