# Boron Nitride Grade BO

Grade BO boron nitride is a grade of hexagonal boron nitride. The graph bars on the material properties cards below compare grade BO 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

1800 *°C* 3270 *°F*

Maximum Temperature: Mechanical

1050 *°C* 1920 *°F*

Maximum Thermal Shock

230 *°C* 440 *°F*

Specific Heat Capacity

1610 *J/kg-K* 0.38 *BTU/lb-°F*

Thermal Conductivity

30 *W/m-K* 17 *BTU/h-ft-°F*

Thermal Expansion

7.5 *µm/m-K*

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

4.4

Dielectric Strength (Breakdown Potential)

61 *kV/mm* 2.4 *V/mil*

Electrical Dissipation At 1 Hz

0.0017

Electrical Dissipation At 1 MHz

0.0011

Electrical Resistivity Order of Magnitude

13 *10 ^{x} Ω-m*

## Other Material Properties

Compressive (Crushing) Strength

170 *MPa* 24 *x 10 ^{3} psi*

Density

1.9 *g/cm ^{3}* 120

*lb/ft*

^{3}Elastic (Young's, Tensile) Modulus

60 *GPa* 8.8 *x 10 ^{6} psi*

Flexural Strength

95 *MPa* 14 *x 10 ^{3} psi*

Poisson's Ratio

0.11

## Common Calculations

Stiffness to Weight: Axial

18 *points*

Stiffness to Weight: Bending

69 *points*

Thermal Diffusivity

9.9 *mm ^{2}/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