Index

Aluminium Nitride ( AlN )

Material Information

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General Description:  

This material has a high electrical resistivity and thermal conductivity. It is therefore suited to the high performance electronic industry, for such applications as integrated circuit packages and heat sinks. Compared with Beryllia in such applications, it is non-toxic and has about half the thermal expansion coefficient. It is translucent to infrared and visible wavelengths (0.5 to 3 µm), and can be used as window material for infrared and radar. It has a high purity and can be used as crucible material for molten metals at high temperatures.
   

Chemical Resistance		      
Acids - concentrated Poor
Acids - dilute Fair
Alkalis Fair
Metals Good

Electrical Properties		      
Dielectric constant 9.2
Dielectric strength ( kV mm-1 ) 35
Volume resistivity @25C ( Ohmcm ) >1013

Mechanical Properties		      
Hardness - Vickers ( kgf mm-2 ) 1100
Shear strength ( MPa ) 450

Physical Properties		      
Density ( g cm-3 ) 3.33
Useful optical transmission range 500-3000nm
Water absorption - saturation ( % ) 0

Thermal Properties		      
Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 4.4
Melting point ( C ) 2200
Specific heat @25C ( J K-1 kg-1 ) 800
Sublimation point ( C ) 2500
Thermal conductivity @20C ( W m-1 K-1 ) 175 - 190
Upper continuous use temperature ( C ) 1000-1800


All information and technical data are given as a guide only. Although every effort has been made to ensure that the information is correct, no warranty is given as to its completeness or accuracy.
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