# Pressure Sintered (Hot Pressed) Aluminum Nitride

Hot pressed AlN is a grade of aluminum nitride. The graph bars on the material properties cards below compare hot pressed AlN 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.

## Mechanical Properties

Compressive (Crushing) Strength

2100 *MPa* 300 *x 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

330 *GPa* 47 *x 10 ^{6} psi*

Flexural Strength

350 *MPa* 51 *x 10 ^{3} psi*

Fracture Toughness

2.9 *MPa-m ^{1/2}* 2.6

*x 10*

^{3}psi-in^{1/2}Knoop Hardness

1160

Poisson's Ratio

0.24

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz

8.8

Dielectric Strength (Breakdown Potential)

17 *kV/mm* 0.64 *V/mil*

Electrical Dissipation At 1 Hz

0.0019

Electrical Dissipation At 1 MHz

0.00068

Electrical Resistivity Order of Magnitude

12 *10 ^{x} Ω-m*

## Other Material Properties

Density

3.3 *g/cm ^{3}* 200

*lb/ft*

^{3}Maximum Temperature: Mechanical

1380 *°C* 2520 *°F*

Maximum Thermal Shock

220 *°C* 440 *°F*

Specific Heat Capacity

780 *J/kg-K* 0.19 *BTU/lb-°F*

Thermal Conductivity

80 *W/m-K* 46 *BTU/h-ft-°F*

Thermal Expansion

5.3 *µm/m-K*

## Common Calculations

Stiffness to Weight: Axial

56 *points*

Stiffness to Weight: Bending

70 *points*

Thermal Diffusivity

31 *mm ^{2}/s*

## Followup Questions

## Further Reading

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015