Development of Overhead Insulated Drawn Copper Wire with Improved Stress Corrosion Cracking durability

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  • 耐応力腐食割れ性能に優れる架空絶縁銅電線の開発
  • タイオウリョク フショク ワレ セイノウ ニ スグレル カクウ ゼツエン ドウ デンセン ノ カイハツ

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Abstract

In this paper, we investigated alloying, crystal grain growing, annealing of copper wire to improve the SCC (Stress-Corrosion-Cracking) durability. Each treatment is effective, in particular, alloying with Ag and annealing are most effective. Varying the concentration of silver and the condition of annealing, the sample alloyed with 0.15Ag wt% and annealed under 260°C is most effective. In accelerated test, it was found that the SCC durability of this sample is improved to be 4 times larger than that of conventional copper wire. We also study the mechanism with which the SCC durability is improved. As the result, we revealed that Ag-dense layers exist. It seemed that this Ag-dense layers block the growth of oxide film and the spreading of pitting corrosion, as the result, SCC durability is improved.<br> Above mentioned, increase in peel strength, weakening of residual distortion stress by annealing, and preventing corrosion and pitting corrosion to spread by Ag-dense layers seemed increase the SCC durability of copper wire with combined effect.

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