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The Definitive Guide on Aluminium Nitride Machining


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The Definitive Guide on Aluminium Nitride Machining

  1. 1. The Definitive Guide on Aluminium Nitride Machining Aluminium Nitride is a high performance material which is used in a wide variety of applications. Commonlyknownbyitschemical name ALN, aluminium Nitride was first synthesized in 1877. But until 1980’s, the potential of ALN was not realized because of its high thermal conductive properties for electrical insulating ceramics. ALN is stable at high temperatures in inert atmospheres and has the melting point of 2800 degree celsius. History of Aluminium Nitride ALN was discovered in 1862 by F. Briegler and A. Geuther. It was first synthesized by J.W. Mallets in 1877. It quicklyevolvedin1984, butproducts producedwithALN were knowntobe inconsistent. It was because of the poor quality powders and inexperienced fabrication technologies. High quality aluminium substrates developed in 1990’s. The consistency of ALN products increased dramatically because of the of emergence in the technologies. ALN is used widely in commercial packages. ALN is a stable compoundinthe periodic systemandexistsincrystal structure. The pure density of ALN is 3.26 g/cm3 and dissociates under atmospheric pressure. Pure ALN is colorless but can be easily coloredbydopantsor impurities. The lightgraycolorof the ALN powerisdue to carbon impurities. The ALN powderissusceptible tohydrolysisbyhumidityandwater. The ammonia smell of the ALN powder is due to this reason. Properties of Aluminium Nitride ALN exhibits goodresistancetoa varietyof materials. Mostmetalssuchas Li, CU, etc formsalloys with ALN, but does not attack it. It is also stable against molten salts. ALN is also capable of withstanding distilledwaterandseawater. Itis covalentlybondedandhas a hexagonal crystal structure. ALN isstable at high temperatures and is stable in hydrogen and carbon dioxide. ALN can be synthesized by carbothermal reduction of alumina or direct nitridation of aluminium. Applications of Aluminium Nitride The most remarkable property of ALN is its high thermal conductivity. The thermal conductivity of copperexceedsthatof copperat moderate temperature. The highheatconductivity coupled with high volume resistivity and dielectric strength makes it a sensible choice to use in a variety of applications related to machining aluminium nitride. Aluminium Nitride substrates provide more cooling than conventional and other substrates. Machining Aluminium Nitride Machining of ALN is done with advanced machining tools and equipment. The use of advanced machining centers (3 Axis, 5 Axis, 7 axis and 9 axis), high speed cutting tools, laser microscopes, measuring machines are used to accurately machine the Aluminium Nitride products to the tightest tolerance levels.