The Properties And Applications of Aluminum Nitride Powder

Aluminum nitride (AlN) AlN in its pure form is blue-white. It is also grayish or off-white. Aluminum nitride is a ceramic material with a variety of excellent properties, such as high thermal conductivity, good electrical insulation, low dielectric coefficient and dielectric losses, non-toxicity and matched thermal expansion coefficient to silicon. It is a ceramic material of a brand new type with comprehensive performance.

Aluminum Nitride Properties

Aluminum nitride exhibits excellent corrosion resistance, especially to molten alloys, including aluminum.

Aluminum nitride exhibits a thermal conductivity of 320W/m*K, which is comparable to BeO and SiC. It is also more than 5x that of Al2O3

(2) The thermal expansion coefficient of Aluminum Nitride (4.5×10-6degC), is the same as that of Si (3.5-2×10-6degC), or GaAs (6×10-6degC).
Aluminum nitride has excellent electrical properties (dielectric constant and volume resistivity)

Aluminum nitride (4) has excellent mechanical properties. It is stronger than Al2O3 ceramics and BeO ceramics and can be sintered with atmospheric pressure.

Aluminum nitride is a good optical transmitter.

Aluminum Nitride ceramics applications

1. Aluminum nitride has a high activity and high purity. It is used to manufacture high-thermal conductivity aluminum nitride substrates.

2. Aluminum nitride is a ceramic substrate with high thermal conductivity. It has a low expansion coefficient and high strength. It is a suitable large-scale heat dissipation material and packaging substrate for integrated circuits.

The hardness of aluminum nitride is much higher than traditional alumina.

4. AIN ceramics have excellent heat resistance, melt-erosive resistance, and thermal shock resistance. They can be used to manufacture GaAs crucibles for crystals, Al evaporating dish, magnetic fluid power generator devices, high temperature turbines corrosion-resistant components, and their optical properties can even be used as an infrared glass. Aluminum nitride can be fabricated into ultra-large-scale integrated substrates, high-frequency piezoelectric components and other products.

5. Aluminum nitride resists heat, is resistant against corrosion caused by molten steel, and is stable with acid. It corrodes more easily in an alkaline solution. The new surface will react with humid air and form a very fine oxide film. It can be used to melt aluminum, copper silver, lead, and other metals using this feature. AIN ceramics can be used to replace toxic ceramics made of beryllium dioxide and they are commonly used in electronics.

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