The formation of Aluminium Nitride during the sintering of aluminium

Kley, Julian (2002). The formation of Aluminium Nitride during the sintering of aluminium Honours Thesis, School of Engineering, The University of Queensland.

       
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Author Kley, Julian
Thesis Title The formation of Aluminium Nitride during the sintering of aluminium
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2002
Thesis type Honours Thesis
Supervisor G.B. Schaffer
J. Drennan
Total pages 76
Language eng
Subjects 091405 Mining Engineering
Formatted abstract
For effective infiltration of porous structures, it is necessary to first form a skeleton so that the part maintains structural rigidity. In this case the skeleton is created due to the formation of aluminium nitride during the sintering process in a nitrogen atmosphere. Currently little is known about the growth of the nitride thus this thesis aims to determine the mechanism of formation of the aluminium nitride through examining the alloys structure. The majority of the information gathered has been determined or confirmed through the use of transmission electron microscopy. Preparation of the sample with the skeleton structure would be difficult using conventional methods, as the material is highly porous and brittle, making it hard to create the thin specimens required. Thus TEM specimens were created using a crushing technique. By searching for the answers into the actual development of the nitride during the sintering process, an understanding of the overall material can be obtained. Thus focus was on characterising and determining the different possible growth mechanisms of aluminium nitride.

The six-hour sinter of the 6061 aluminium alloy formed aluminium nitride of a wurtzite structure. The skeleton formed during sintering was not pure AlN. Experimental data showed magnesium, silicon and oxygen in the areas of nitride. It is proposed that the nitride layer is matrix of aluminium containing many small aluminium nitride grains. This matrix is considered to play an important role in the diffusion mechanisms throughout the reaction. The roles of the magnesium and silicon alloying elements in the formation of the nitride skeleton are also discussed. Reactions that occur throughout the development of the nitride are investigated, along with the possible substitution of oxygen into the AlN lattice. It was concluded that the formation of aluminium nitride is a complex system of reactions, where further research is needed to test the validity of proposed reaction mechanisms.
Keyword Aluminium

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
 
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Created: Thu, 04 Dec 2014, 13:04:11 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service