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Aluminum Nitride is a preferred choice for substrate and thermal management applications

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Some nanomaterials for Thermochromic Application Some nanomaterials for Thermochromic Application

Thermochromism refers to the phenomenon where a material undergoes color changes under temperature changes. This change is usually caused by changes in the electronic or molecular structure of the material. Its application principle mainly involves t...

Aluminum Nitride is a preferred choice for substrate and thermal management applications

  • May 12,2015.
Aluminum Nitride is a unique ceramic material that combines high thermal conductivity with high electrical resistivity. Only a few ceramics possess high thermal conductivity: Beryllium Oxide (BeO) and cubic Boron Nitride (c-BN) are virtually the only other examples. However, the use of BeO is restricted due to its toxicity and c-BN is very hard to produce.

For the thermal conductivity is the ability of a material to transport heat when subjected to a temperature gradient. In dielectrics like Aluminum Nitride, heat is transferred through lattice vibrations (also known as "phonons"). Materials with simple structure, covalent bonding and low atomic mass generally possess high thermal conductivity.
The actual thermal conductivity of a material is affected by factors that hinder phonon propagation. Temperature, impurities, pore size and distribution, grain size, compositional homogeneity and orientation all affect the lattice vibrations, and therefore thermal conductivity.

The theoretical thermal conductivity of Aluminum Nitride is about 280 Wm-1K-1. The actual thermal conductivity depends on processing conditions and raw material purity. The presence of oxygen impurities in the lattice is a major detriment; As oxygen displaces nitrogen in the lattice it creaes vacancies that interrupt phonon propagation and scatter the phonons, therefore reducing thermal conductivity.
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