The Properties And Applications of Aluminum Nitride Powder

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Aluminum nitride (AlN) is hexagonal, and pure AlN is blue-white, usually gray or off-white. Aluminum nitride ceramics have a series of excellent characteristics such as excellent thermal conductivity, reliable electrical insulation, low dielectric constant and dielectric loss, non-toxicity, and thermal expansion coefficient matching silicon. It is a new type of ceramic material with excellent comprehensive performance.

Aluminum Nitride Properties

Aluminum nitride has the characteristics of not being corroded by molten aluminum, other molten metals and gallium arsenide, and especially has excellent corrosion resistance to molten aluminum.

(1) Aluminum nitride has high thermal conductivity (about 320W/m*K), which is close to BeO and SiC, and is more than 5 times that of Al2O3;

(2) The thermal expansion coefficient of aluminum nitride (4.5×10-6degC) matches with Si (3.5-4×10-6degC) and GaAs (6×10-6degC);
(3) Various electrical properties of aluminum nitride (dielectric constant, dielectric loss, volume resistivity, dielectric strength) are excellent;

(4) Aluminum nitride has good mechanical properties, higher flexural strength than Al2O3 and BeO ceramics, and can be sintered at atmospheric pressure;

(5) Aluminum nitride has good optical transmission characteristics;

Aluminum Nitride Ceramics Applications

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

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

3.Aluminum nitride has high hardness, which is higher than that of traditional alumina.It is a new type of wear-resistant ceramic material.

4. Utilizing the heat resistance, melt erosion resistance and thermal shock resistance of AIN ceramics, GaAs crystal crucibles, Al evaporating dishes, magnetic fluid power generation devices, and high temperature turbine corrosion-resistant parts can be made, and its optical properties can be used as infrared windows. Aluminum nitride film can be made into high-frequency piezoelectric components, ultra-large-scale integrated circuit substrates, etc.

5. Aluminum nitride is heat-resistant, resistant to corrosion by molten metal, stable to acid, but easily corroded in alkaline solution. The new surface of AIN will react when exposed to humid air to form a very thin oxide film. Using this feature, it can be used as a crucible and casting mold material for melting aluminum, copper, silver, lead and other metals. AIN ceramics have good metallization properties and can replace toxic beryllium oxide ceramics and are widely used in the electronics industry.

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