Abstract
The application of ball-milling for reactant powders to improve the intermetallic coating reaction was examined. Ni-50 at.% Al powder compacts milled at three different ball-to-powder weight ratios in a planetary mill were analyzed by differential scanning calorimetry (DSC) and coated onto mild steel through the reaction synthesis in a hot press. The effects of ball-milling on the coating reaction in the hot press were compared with those in the reaction synthesis in DSC. The experimental results show that the particle size of the elemental powders was decreased by ball-milling, and that the coating reaction in the hot press was enhanced by ball-milling for the reactant powders, unlike the reaction synthesis in DSC. This improvement was attributed to the increase in the density of the reactant compact by the load applied during the reaction.
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