Introduction to AlN powder Aluminum Nitride
is a covalent bonds compound. Its chemical formula, AIN. It is anatomical crystal and belongs in the diamond-like, hexagonal nitride system. The crystal structure is wurtzite-type, non-toxic, off-white or white.
This synthetic mineral is not found in nature. AlN’s crystal structure is hexagonal wurtzite, with low density (3.26g/cm3). It has high strength, good heat resistance (Decomposition occurs at 3060), high thermal conductivity.
AlN Powder Physicochemical Properties
AlN remains stable above 2200. It has a high strength at room temperatures and a slow decrease in strength with temperature increases. AlN is very heat shock-resistant due to its high thermal conductivity and low thermal expansion coefficient. It can be used to melt and cast pure iron, aluminum, and aluminum alloys. Aluminum nitride also has good dielectric properties. It is also a promising electric component. It is protected by ionization during annealing thanks to the aluminum nitride coat on gallium arsenide. Aluminum nitride also acts as a catalyst in the conversion of hexagonal to cubic boron nutride.
At room temperature, it reacts slowly with water. It can also be produced from aluminum powder, ammonia, and nitrogen at 8001000. The product ranges from white to grayish blue powder. Gray powder can be obtained by using the al2O3C–N2 system reaction synthesis at 16001750. Or, you can use aluminum chloride and ammonia gases in the opposite direction. By vapor deposition, the AlCl3/NH3 system can be used to make the coating.
1. It has a high thermal conductivity of about 320W/m*K, which is close to SiC and BeO, and more than 5x that of Al2O3
2. Excellent electrical properties (eg, dielectric constant, dielectric loss, body resistivity, dielectric strength);
3. Good mechanical properties. The flexural strength of BeO and Al2O3 ceramics is higher than theirs and can be atmospherically sintered.
4. Excellent optical transmission properties
|Aluminum Nitride AlN Powder Properties|
|Other names||Aluminium nitride|
|Appearance||White to pale yellow powder|
|Boiling Point||2517 degC (dec.)|
|Solubility of H2O||N/A|
Aluminum Nitride AlN Powder – Applications
AlN’s piezoelectric property makes it possible for the extensional extension to AlN crystals to be used in surface acoustic-wave detectors. These detectors will be placed onto silicon wafers.
Aluminum nitride ceramics
They have high room temperature, high-temperature strength, and a low coefficient for expansion. This makes them suitable to be used as high heat structural parts of heat exchanger materials.
Due to their corrosion resistance against iron, aluminum and other metals, the aluminum nitride clays can be used for crucibles or casting material for melting Al and Cu, Ag and Pb.
Aluminum nitride ceramics
High-tech ceramics are a new breed. The characteristics of aluminum nitride substrate include high thermal conductivity and good thermochemical stability. It can be used as a packaging material, heat dissipation, component, interconnect carrier, and circuit components for large-scale integrated and semiconductor circuits. It is also an excellent additive to increase the thermal conductivity, mechanical properties, and thermal performance of polymer material. Aluminum nitride can also be used in smelting nonferrous metal and semiconductor galium arsenide. Aluminum nitride can be used as an electrical insulator and has good dielectric properties. The gallium arsenide’s aluminum nitride coat protects it against ion implantation during annealing.
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