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http://dx.doi.org/10.9725/kts.2021.37.2.62

Effects of Pre-Annealing Treatment on the Combustion Synthesis of Ni3Al Intermetallics Coating  

Lee, Han-Young (Department of Advanced Materials Engineering, Keimyung University)
Mo, Nam-Kyu (Department of Materials Engineering, Keimyung University)
Publication Information
Tribology and Lubricants / v.37, no.2, 2021 , pp. 62-70 More about this Journal
Abstract
The problem with intermetallics coating using the heat of molten casting is that the heat generated during combustion synthesis dissolves the coating and the substrate metal. This study investigates whether pre-annealing before synthesis can control the reaction heat, with the aim of Ni3Al coating on the casting surface. Therefore, the effects of the annealing temperature and time on the combustion synthesis behavior of the powder compact of Ni-25at%Al after annealing were investigated. As results, the reaction heat when synthesized decreased as the annealing temperature was high and the annealing time was longer. This was attributed to the fact that Al was diffused to Ni particles during low temperature annealing and intermediate Ni-Al compounds were formed during high temperature annealing. After combustion synthesis, however, it was found that their microstructures were almost identical except for the amount of intermediate intermetallics. Furthermore, an annealing temperature above 450℃, at which intermediate compounds begin to form, is needed to prevent the dissolving problem during synthesizing. The intermetallics synthesized after annealing at higher temperature and prolonger annealing time showed a good wear resistance. This might be because much intermediate intermetallics of high hardness were remained in the microstructure.
Keywords
reaction heat; heat of molten casting; coating; pre-annealing; combustion synthesis;
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