Aluminum Nitride (AlN)

Aluminum nitride is a non-oxide engineering ceramic material.

It has five common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Compressive (Crushing) Strength2100 MPa (300 x 103 psi)

Density2.9 to 3.3 g/cm3 (180 to 210 lb/ft3)

Dielectric Constant (Relative Permittivity) At 1 MHz6.9 to 28

Dielectric Strength (Breakdown Potential)15 to 56 kV/mm (0.59 to 2.2 V/mil)

Elastic (Young's, Tensile) Modulus330 GPa (48 x 106 psi)

Electrical Dissipation At 1 Hz0.0019

Electrical Dissipation At 1 MHz0.00020 to 0.00090

Electrical Resistivity Order of Magnitude10 to 12 10x Ω-m

Flexural Strength190 to 400 MPa (28 to 58 x 103 psi)

Fracture Toughness2.9 MPa-m1/2

Knoop Hardness1160

Maximum Thermal Shock230 °C (450 °F)

Poisson's Ratio0.21 to 0.31

Specific Heat Capacity780 J/kg-K

Thermal Conductivity80 to 200 W/m-K

Thermal Diffusivity31 to 35 m2/s

Thermal Expansion4.2 to 5.4 µm/m-K

The length of each bar compares the given value to the highest value in the database.

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