HIGH ELECTRIC CONDUCTIVITY AND HIGH STRENGTH COPPER MATRIX COMPOSITE MATERIAL AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To obtain a composite material having sufficient strength by chromium fiber of small size and combining high bendability and high electric conductivity by subjecting dentrites essentially consisting of Cr and crystallized into a copper matrix to solution treatment in the process of forming chromium fiber. ;SOLUTION: An alloy material composed of, by weight, 1 to 25% Cr, ≤8% Ag or Zr, and the balance substantial copper is subjected to swaging working, is thereafter subjected to cold drawing and is subjected to solution treatment. Then, the cold drawing is continuously executed, and age hardening treatment is executed. The drawing is executed till the working degree after the drawing reaches ≥7, but, when the working degree reaches the range of 3 to 4, the solution treatment is executed, when the working degree reaches ≥7, the aging treatment is executed, and the working degree per time in the cold drawing is preferably regulated to the range of 0.01 to 0.5. Since Ag or Zr is used as precipitating metallic phases, the heat treatment for the precipitation causes no coarsening of the Cr fiber and does not remarkably deteriorate the electric conductivity of copper.;COPYRIGHT: (C)1998,JPO