Mitsubishi Materials Corporation

Railway Technical Research Institute

Kenji Yajima

Yutaka Koshiba

Takuro Iwamura

Haruhiko Asao

Yoshiharu Mae

Hiroki Nagasawa

Sumihisa Aoki

Akihiro Kakimoto

Motoo Goto

Shizuo Kawakita

Syunji Ishibashi

Atsushi Sugahara

Keiji Nogami

Norikazu Ishida

Hideyuki Ikenoya

A phosphorized copper anode used for electroplating, including: 20-800 ppm of phosphorus; between 0.1 and less than 2 ppm of oxygen, and the balance being high purity copper having a purity of 99.9999% by mass or higher, wherein the average grain size of the copper anode after recrystallization is in the range between about 10 and 50 &mgr;m.

Phosphorized copper anode for electroplating

A method and apparatus for manufacturing copper and/or copper alloy ingots having no shrinkage cavities and having smooth surfaces without wrinkles are provided. The apparatus comprises a bottom-casting type melting furnace and a heating furnace for heating a mold in which the molten metal is cast. The method comprises the steps of melting the material of copper and/or copper alloy, and casting the molten copper and/or molten copper alloy into a cylindrical mold which is placed on a cooled pedestal provided at the bottom of the heating furnace and the side wall of which is heated by the heating furnace so as to form a temperature gradient increasing from the bottom to the top of the mold.

Method and apparatus for manufacturing copper and/or copper alloy ingot having no shrinkage cavity and having smooth surface without wrinkles

A wire for electric railways comprises a copper alloy which consists essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, 0.05 to 0.15% Sn, and 10 ppm or less O, and if required, further contains 0.01 to 0.1% Si, or 0.01 to 0.1% Si and 0.001 to 0.05% Mg, with the balance being Cu and inevitable impurities.

Wire for electric railways

A wire for electric railways comprises a copper alloy which consists essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, and 10 ppm or less O, and if required, further contains at least one element selected from the group consisting of 0.01 to 0.1% Si and 0.001 to 0.05% Mg, with the balance being Cu and inevitable impurities. The wire is manufactured by hot working a copper alloy billet having the above composition, immediately quenching the hot worked billet to prepare an element wire, cold working the element wire at least once, and subjecting the cold worked element wire to aging treatment.

Method for producing wire for electric railways

Growing community of inventors

Saitama, Japan

Kenji Yajima