Manufacturing Industry
Sparklers.(Stress Relief)
Advanced Materials & Processes, June, 2004
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To make sparklers, the first step is to coat carbon steel wires 17 cm long with pure copper. The coated wires are aligned in straight rows of 400 on a board, and are dipped into a thick gray liquid that contains powders of two different aluminum alloys and two adhesive agents: dextrin and flour.
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The sparklers are partially dried, then dipped into a mixture of iron powder, barium nitrate (as an oxygen carrier), and "sander dust," a very fine iron powder. The key to the sparkler's sparks is the iron powder, which is made by quenching molten ...
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