加速劣化による半硬銅線の応力腐食割れの観察

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2018/07/01

タイトル(英語): Observation of Stress Corrosion Cracking of Semi-hard Drawn Copper Wire using Accelerated Aging

著者名: 熊澤　孝夫（中部電力（株）エネルギー応用研究所）

著者名(英語): Takao Kumazawa (Energy Applications R&D Center, Chubu Electric Power Co., Inc.)

キーワード: 絶縁電線，半硬銅線，応力腐食割れ，引張り荷重　　insulated wire，semi-hard drawn copper wire，stress corrosion cracking，tensile load

要約(英語): Insulated copper wires for overhead distribution line could fracture because of stress corrosion cracking (SCC). In order to investigate the relationship between fracture time and tensile load of stranded copper wire, we observed the SCC of semi-hard drawn copper wire using an original accelerated SCC test. In this test stranded copper wire samples 60 mm2 in size different from the tensile load were manufactured by changing the annealing condition tentatively. These samples, wound around PVC pipes 318 mm in diameter applying the prescribed tension, were exposed to vapor of HNO3 solution in an airtight chamber controlled at 60±2℃. The fracture time of each sample was recorded by periodic visual observation. From the results the fracture time was remarkably prolonged with a decrease in the tensile load. Furthermore, it was shown that the fracture time of hard drawn stranded copper wire having the tensile load near the lower limit, i.e., 23.6 kN standardized in Japan was extended by 3 to 4 times compared with the conventional copper wire having that of about 26 kN. Thus, a new technique to control the annealing condition exactly for mass-production of hard drawn copper wire with high SCC durability is desired to be established.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.138 No.7 （2018）

本誌掲載ページ: 387-393 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/138/7/138_387/_article/-char/ja/