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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 103 psi

Elastic (Young's, Tensile) Modulus

330 GPa 47 x 106 psi

Flexural Strength

350 MPa 51 x 103 psi

Fracture Toughness

2.9 MPa-m1/2 2.6 x 103 psi-in1/2

Knoop Hardness


Poisson's Ratio


Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz


Dielectric Strength (Breakdown Potential)

17 kV/mm 0.64 V/mil

Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

12 10x Ω-m

Other Material Properties


3.3 g/cm3 200 lb/ft3

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 mm2/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