| It has been known that lead causes hot shortness of copper. Recent continuous casting process of copper scrap for electrical purpose needs to maintain lead content of copper rod above 400 ppm to avoid hot shortness and casting defects. In this study, to discover the effect of lead on the high-temperature mechanical properties of copper, five kinds of copper test samples with different lead content were made and tested at 850℃ with various cross head speeds. At low cross head speed, lead caused hot shortness of copper and mechanical properties of specimens containing lead were worse than those of pure copper, but at high cross head speed, 600 ppm of lead improved mechanical properties of copper. And mechanical properties of specimen containing 600 ppm of lead were comparable to those of pure copper. |
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