99.99 aln ceramic aluminum nitride cup crucible

Aluminum nitride, whose chemical formula is ALN, is an important structural ceramic material. It is a superhard substance that resists wear and tear and resists oxidation at high temperatures. The hardness of aluminum nitride ceramics is second only to diamond, boron carbide and cubic boron nitride, and aluminum nitride ceramics rank fourth in inorganic materials. At present, aluminum nitride with high density can be prepared by hot pressing sintering method. It has high strength and good oxidation resistance. It can maintain no deformation under high temperature conditions.

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Aluminum nitride (AlN)

Aluminum nitride (AlN) ceramic material was found to be promising in microelectronics applications, due to its very high thermal conductivity and property as an insulating ceramic. Recently, the most common application for aluminum nitride is substrate for electronics or chip carriers. Along with PBN crucibles, AlN is also one of the selected materials to build crucibles for grow crystals of GaN (gallium nitride)
Aluminum nitride crucibles could withstand about 1300°C in air, without bulk oxidation, although the process started after 700°C. In vacuum, AlN decompose at 1800°C. AlN melts at 2200°C, with inert atmosphere protection. In general, the working temperature for AlN products is 800°C in air, 1700°C in vacuum and 2100°C in inert atmosphere.

Material data sheet

Item	Unit	Aluminium Nitride ceramic/AlN
Linear expansion coefficient	RT-400℃,10-6	4.4
Bulk density	g/cm3	3.2
Thermal conductivity	20 ℃,W/m.k	≥170
Flexural strength	Mpa	≥330
Bulk resistance	Ω.cm	≥10 14
Dielectric strength	KV/mm	≥15
Dissipation factor	1 MHz	3 x 10-4
Dielectric constant	1 MHz	9.0

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