Metallurgical Engineering

Metallurgical Engineering

Mechanical Milling of Aluminum Chips, 3000 and 5000 series

Document Type : Research Paper

Authors
Narmin Malekpoor 1
maziyar azadbeh 2
1 M.Sc. Student, Department of Materials Engineering, Sahand University of Technology,
2 Professor, Department of Materials Engineering, Sahand University of Technology,
10.22076/me.2018.49941.1099
Abstract
In this study, the solid state recycling of aluminum waste (3000 and 5000 series) through mechanical milling, leads to production of nano-crystalline aluminum powders. For this goal, aluminium used beverage cans, which usually consist of body (75%), lid (22%) and opening part (3%), are used as raw material. The body, lid and opening of cans usually are alloyed 3004, 5182 and series of 5017, 5042 or 5082, respectively. After two-steps hammer milling of cans, fine chips with 10 mm in size was achieved. The de-coating and chemical cleaning operations were performed to remove the paint layer and other contaminations (such as oil and oxides), respectively. The ball milling was accomplished on clean aluminum fine chips in a planetary ball mill under argon atmosphere for various times up to 48h. The results show that the short time would not be enough for milling. On the other hand too long times are unwelcome either, apparently as a consequence of microstructure leads to agglomeration. In the case of process controlling agent, however it leads to finer powder production, it contaminates the final product due to decomposition during milling. Since mechanical milling without PCA would be suitable. Totally, at least for the condition used in this investigation, 24h mechanical milling without PCA for production clean nano crystalline Al powders finer than 50nm in crystalline size with uniform size (smaller than 40 µm) will be recommended.
Keywords
3000 and 5000 aluminum alloy
solid state recycling
ball milling
producing nano crystalline powders
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  • Receive Date 10 October 2017
  • Revise Date 22 December 2017
  • Accept Date 22 December 2017