Aluminium nitride properties

When controlled nitridation of surface layers is required, as for example in the modification of the chemical properties of the surface of a support, the atomic layer deposition (ALD) technique can be applied." This technique is based upon repeated separate saturating reactions of at least two different reactants with the surface, which leads to the controlled build-up of thin films via reaction of the second component with the chemisorbed residues of the first reactant. Aluminium nitride surfaces have been prepared on both alumina and silica supports by this method wherein reaction cycles of trimethylaluminium and ammonia have been performed with the respective supports, retaining their high surface areas." This method has been applied to the modification of the support composition for chromium catalysts supported on alumina." ... 

Hydrazoic acid is a weak acid like acetic acid. Mendeleyev [40] noted its acidic properties. It reacts with zinc, iron, magnesium and aluminium, to form azides with evolution of hydrogen (Curtius and Rissom [41] Curtius and Darapsky [42], A small amount of ammonia is also produced, due to the reduction of hydrazoic acid. According to Sofianopoulos [43] heated A1 dust reacts with HN3 to form aluminium nitride... 

The carbides and nitrides are well known for their hardness and strength, and this section will briefly compare a number of these properties with those of the pure metals. Concentration will be placed here on the first row compounds, since these constitute a complete series, and Mo and W, since these are the most commonly studied metals. As will be shown, the physical and mechanical properties of carbides and nitrides resemble those of ceramics not those of metals. Comparisons will be made with boron carbide (B4C), silicon carbide (SiC), aluminium nitride (AIN), silicon nitride (Si3N4), aluminium oxide (A1203), and diamond, as representative ceramic materials. 

M. Descamps, B. Thierry, A. Leriche, Powder characteristics influence on the properties of tape casted alumina and aluminium nitride materials. Extended abstract of International Conference on Shaping of Advanced Ceramics, April 25-27,1995, Mol, Belgium. 

Zientara D, Bucko MM, Lis J (2007) Dielectric properties of aluminium nitride-y-AlO materials. J Eur Ceram Soc 27 4051-4054... 

Solid carbide drills, taps and end milling cutters are available for cutting a wide variety of materials. Some have a surface coating such as titanium aluminium nitride (TiAlN) which fiirther enhances cutting performance, offering different levels of surface hardness, thermal and frictional properties. 

Chromium aluminium nitride has shown promising properties for cutting and wear applications, such as high hardness, wear- and oxidation resistance. Increasing the amount of aluminium in Cr-N coatings increases the oxidation resistance of the film by formation of an aluminium oxide layer on the surfaced There are many reports on thin film production of CrAlN-films , but the material is much less studied in bulk form. 

Mechanical properties Symbol Units Silicon nitride, sintered Silicon nitride, reaction- bonded Silicon nitride, hot-pressed Silicon nitride, reaction- bonded Aluminium nitride... 

Ryder, C.. Vidoz, A., Crossman, F., Camahorl, J. (1970), Mechanical properties of nitrided boron-aluminium composites, J. Composite Mater. 4, 264-272. 

Silicon nitride, oxynitride and silicon aluminium oxynitride (SiAlON) compounds are of considerable technical interest as advanced ceramics because of their stability and chemical inertness at elevated temperatures, and their excellent mechanical properties. Si MAS NMR has proved to be useful in studying various aspects of these compounds, including their formation and structure, the processes by which they are... 

---