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Review On Aluminum Nitride Properties And AlN Ceramic

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Update time : 2020-02-18 08:41:31

The aluminum nitride powder produced by Nanotrun has high purity, small  particle size, uniform distribution, large specific surface area, high surface  activity, low bulk density, excellent dispersibility, and injection molding  properties and can be used in composite materials. The chemical formula is AlN,  it has good compatibility with semiconductor silicon, good interface  compatibility, and can improve the mechanical properties and thermal  conductivity and dielectric properties of composite materials.
 

Aluminum Nitride Properties:

Aluminum nitride powder can be stable up to 2200 °C and has high strength at  room temperature, and the strength decreases slowly with increasing temperature.  It has good thermal conductivity and a small thermal expansion coefficient and  is a good thermal shock resistant material. Aluminum nitride has a strong  resistance to molten metal erosion 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 is 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 conversion of  hexagonal boron nitride to cubic boron nitride.


 

Aluminum nitride powder can be produced by the reduction of aluminum oxide  and carbon or by direct nitriding of aluminum metal. Aluminum nitride is a  substance connected by covalent bonds. The powder has a hexagonal crystal  structure and is the same shape as zinc sulfide and fiber zinc. The space group  of this structure is P63mc. Industrial grade materials can only be manufactured  by hot pressing and welding. The substance is very stable in an inert,  high-temperature environment.

In the air, when the temperature is higher than 700 °C, oxidation will occur  on the surface of the substance. At room temperature, 5-10 nm thick oxide films  can still be detected on the surface of the material. Up to 1370 °C, oxide films  can still protect substances. However, when the temperature is higher than 1370  °C, a large amount of oxidation occurs. Up to 980 °C, aluminum nitride is still  quite stable in hydrogen and carbon dioxide.
 

Aluminum nitride AlN ceramic:

1. Aluminum nitride powder has high purity, small particle size, and high  activity. It is the main raw material for manufacturing aluminum nitride ceramic  substrates with high thermal conductivity.
 

2. Aluminum nitride ceramic substrate has high thermal conductivity, low  expansion coefficient, high strength, high-temperature resistance, chemical  resistance, high resistivity, and small dielectric loss. It is an ideal  large-scale integrated circuit heat sink substrate and packaging material.
 

3. Aluminum nitride has high hardness, surpassing traditional alumina, and it  is a new type of wear-resistant ceramic material. Still, due to its high cost,  it can only be used in areas with severe wear.
 

4. Using AIN ceramics' heat resistance and melt erosion resistance and  thermal shock resistance, GaAs crystal crucibles, Al vaporizers, magnetic fluid  power generation devices, and high-temperature turbine corrosion-resistant  components can be produced. Its optical properties can be used as infrared  windows. Aluminum nitride films can be made into high-frequency piezoelectric  elements, ultra-large-scale integrated circuit substrates.


 

5. Aluminum nitride is heat-resistant and resistant to the erosion of the  molten metal. It is stable to acids but easily eroded in alkaline solutions.  When exposed to humid air, the newly formed AIN surface will react to form an  extremely thin oxide film. Utilizing this characteristic, it can be used as a  crucible and firing mold material for melting metals such as aluminum, copper,  silver, and lead. AIN ceramics have better metallization properties and can be  used in the electronics industry to replace toxic beryllium oxide ceramics.
 

Due to its excellent thermal, electrical, and mechanical properties, aluminum  nitride ceramics have attracted widespread attention from researchers at home  and abroad. With the rapid development of modern science and technology, higher  requirements have been placed on the properties of the materials used. Aluminum  nitride ceramics will also be more widely used in many fields.
 

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