Aluminum nitride is an atomic crystal, belonging to diamond-like nitride, hexagonal crystal system, wurtzite crystal structure, non-toxic, aluminum nitride is white or off-white powder.
What is the property of aluminum nitride?
AlN can be stabilized up to 2200℃, the room temperature strength is high, and the strength increases and decreases slowly with temperature. Aluminum nitride has good thermal conductivity and low thermal expansion coefficient, making it a good thermal shock material. It has strong resistance to molten metal corrosion and is an ideal crucible material for casting pure iron, aluminum or aluminum alloy.
Aluminum nitride is also an electrical insulator with good dielectric properties, and it is also promising as an electrical component. The aluminum nitride coating on the surface of gallium arsenide can protect it from ion implantation during annealing. Aluminum nitride is also a catalyst for the transformation from hexagonal boron nitride to cubic boron nitride.
What is the application of aluminum nitride?
Aluminum nitride is used in optoelectronic engineering, including as dielectric layer in optical storage interface and electronic substrate, as chip carrier with high thermal conductivity, and for military use.
Due to the characteristics of the piezoelectric effect of aluminum nitride, the epitaxial stretching of aluminum nitride crystals is also used in surface acoustic wave detectors. The detector is placed on a silicon wafer, and there are very few places where these thin films can be reliably manufactured.
The use of aluminum nitride ceramics has high room temperature and high temperature strength, small expansion coefficient, and good thermal conductivity. It can be used as a heat exchanger material for high-temperature structural parts.
Using aluminum nitride ceramics can withstand the corrosion properties of metals and alloys such as iron and aluminum, it can be used as a crucible and casting mold material for melting metals such as Al, Cu, Ag, Pb.
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