| abstract |
PURPOSE:To prevent oxidation of a surface, by forming a film of noble metal or corrosion resisting metal on the surface of minute high impurity copper wire having the specified value of impurity. CONSTITUTION:On the surface of minute high impurity copper wire having the impurity of 99.999% or higher, a film, which comprises noble metal such as alloy, whose main components are Au, Ag, Pt, Pd, and corrosion resisting metal, whose main components are Ni, Co, Cr, Ti, is formed. The surface property of the surface-coated minute high impurity copper is excellent. There is almost no time change. Even after bonding, stable performances can be obtained. |