Pyrolytic Boron Nitride
Pyrolytic boron nitride is a grade of hexagonal boron nitride. The graph bars on the material properties cards below compare pyrolytic 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 °C 2080 °F
Maximum Temperature: Mechanical
2350 °C 4260 °F
Maximum Thermal Shock
1720 °C 3130 °F
Specific Heat Capacity
840 J/kg-K 0.2 BTU/lb-°F
Thermal Conductivity
42 W/m-K 24 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 MHz
4.3
Dielectric Strength (Breakdown Potential)
200 kV/mm 7.8 V/mil
Electrical Dissipation At 1 Hz
0.0017
Electrical Dissipation At 1 MHz
0.0018
Electrical Resistivity Order of Magnitude
15 10x Ω-m
Other Material Properties
Compressive (Crushing) Strength
250 MPa 37 x 103 psi
Density
2.1 g/cm3 130 lb/ft3
Elastic (Young's, Tensile) Modulus
23 GPa 3.3 x 106 psi
Flexural Strength
140 MPa 20 x 103 psi
Poisson's Ratio
0.11
Tensile Strength: Ultimate (UTS)
40 MPa 5.8 x 103 psi
Common Calculations
Stiffness to Weight: Axial
6.0 points
Stiffness to Weight: Bending
45 points
Strength to Weight: Axial
5.3 points
Strength to Weight: Bending
12 points
Thermal Diffusivity
24 mm2/s
Thermal Shock Resistance
7.1 points
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