What is Aluminum nitride?
Aluminum nitride, a covalent bond compound, chemical formula AIN, is an atomic crystal, belongs to diamond-like nitride, hexagonal crystal system, wurtzite crystal structure, non-toxic, white or off-white. AlN can be stabilized up to 2200℃. The room temperature strength is high, and the strength decreases slowly with the increase of temperature. It 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 melting and 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. It reacts slowly with water at room temperature. It can be synthesized from aluminum powder at 800~1000℃ in ammonia or nitrogen atmosphere. The product is white to grayish blue powder. Or synthesized by the Al2O3-C-N2 system at 1600~1750℃, the product is off-white powder.
The application of Aluminum nitride:
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 will be placed on the silicon wafer. 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.
Due to the excellent characteristics of Aluminum nitride in electrical, thermal and mechanical properties, it is widely used in the field of semiconductor electronic packaging.
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