ROTATING-DISK COATINGS FOR CENTRIFUGAL ATOMIZATION OF ALUMINUM AND MAGNESIUM ALLOYS

Various ceramic coatings, plasma-sprayed on 1020 steel rods, were eval uated under static and dynamic conditions in molten aluminium. On the basis of the results of this study, a graded coating consisting of thr ee layers (a metal bond coat, a compliant layer and a top ceramic coat ing) was selected to protect 304 stainless steel disks used for centri fugal atomization of aluminium and magnesium alloys. The characteristi cs and performance of the different coatings tested in molten aluminiu m are reported as well as those of the graded coating developed for th e rotating disk. This graded coating was successfully tested under var ious atomization conditions at rotation rates up to 70000 RPM. Copyrig ht (C) 1996 Canadian Institute of Mining and Metallurgy.