Aluminum Nitride

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AlN was first synthesized in 1877, but it was not until the middle of the 1980s that its potential for application in microelectronics was realized due to its relative high thermal conductivity for an electrical insulating ceramic (70–210 W·m−1·K−1 for polycrystalline material, and as high as 285 W·m−1·K−1 for single crystals).

Aluminum nitride is stable at high temperatures in inert atmospheres and melts at 2800 °C. In a vacuum, AlN decomposes at ~1800 °C. In the air, surface oxidation occurs above 700°C, and even at room temperature, surface oxide layers of 5-10 nm have been detected. This oxide layer protects the material up to 1370°C. Above this temperature bulk oxidation occurs. Aluminum nitride is stable in hydrogen and carbon dioxide atmospheres up to 980°C.

The material dissolves slowly in mineral acids through grain boundary attack, and in strong alkalies through attack on the aluminium nitride grains. The material hydrolyzes slowly in water. Aluminum nitride is resistant to attack from most molten salts, including chlorides and cryolite.

PropertyValue
General
Chemical Formula

Al-N

Mechanical
Density
3.25 gm/cc
Hardness

1170 Knoop

Modulus of Elasticity

43 - 50 x 106 psi

Flexural Strength
43 - 62 kpsi
Compressive Strength
300 kpsi
Poisson's Ratio
0.22
Fracture Toughness
2.9 MPa m<sup>½</sup>
Electrical
Dielectric Strength
431 V/mil
Dielectric Constant
8 - 9 (@ 1 MHz)
Volume Resistivity

> 1011 ohm-cm

Thermal
Coefficient of Thermal Expansion

4.6 - 5.7 x 10-6/°C

Thermal Conductivity
100 - 180 W/mK
Maximum Working Temperature
1200 °C

All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

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