For such applications fabrication of thick AlN coating by thermal spray into the chosen material surface considered to be suitable solution. However, it is impossible to fabricate AlN coating directly by conventional thermal spraying due to the AlN thermal decomposition without melting.
SEM cross section images of the AlN coatings fabricated with using N2 plasma gas flow rate of: (a) 100, (b) 120, (c) 160 l/min and (d-f) are higher magnifications of the squared parts in (a-c).
Here, Mohammed Shahien and colleagues at Toyohashi University of Technology, Japan report on the realization of cubic AlN coatings on steel substrates by atmospheric reactive plasma spraying of fine Al2O3 feedstock powder in N2/H2 plasma.
The formation process was clarified thus, during spray the particles melted, spheroidized and nitrided in the plasma to form the cubic aluminum oxynitride then cubic-AlN. Furthermore, using smaller particle size enhanced the surface (reaction) area and improved the nitriding conversion.
It was possible to fabricate thick and uniform coatings with high AlN content by spraying fine Al2O3/AlN mixture and the thickness increased from about 150 µm to about 200 µm with increasing the N2 gas flow rate from 100 to 160 l/min.
These results are important for the manufacture of high performance equipment for the materials manufacturing including semiconductors.
Affiliation: Interface & Surface Fabrication Laboratory, Department of Mechanical Engineering
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