Process for producing high-strength, high-electroconductivity co

Details Process for producing high-strength, high-electroconductivity co Process for producing high-strength, high-electroconductivity co

1996-06-13

1998-09-29

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148684, 148685, C22F 108

Patent

active

058141685

ABSTRACT:
High-strength, high-electroconductivity copper alloys are produced by preparing an ingot of a copper alloy containing 0.05-0.40 wt % Fe, 0.05-0.40 wt % Ni, 0.01-0.30 wt % P, and optionally a total of 0.03-0.50 wt % of either Sn or Zn or both and a total of 0.05-0.50 wt % of at least one element of Ag, B, Mn, Cr, Si, Ti or Zr, with the balance being Cu and incidental impurities, heating the ingot to 800.degree. to 950.degree. C. and hot working it by a reduction ratio of 50% or more, quenching the hot worked material from 600.degree. C. or above to 300.degree. C. or below at a cooling rate of at least 1.degree. C./sec, heat treating the quenched material at 380.degree. to 520.degree. C. for 60 to 600 minutes without performing cold working, and cold working and heat treating it at 450.degree. C. or below, to precipitate an Fe--Ni--P system intermetallic compound in the Cu matrix as uniform and fine grains not larger than 50 nanometers. The copper alloys thus produced are superior in hardness, tensile strength, electrical conductivity and amenability to bending. The copper alloys are useful for making electric and electronic components, such as leadframes.

REFERENCES:
patent: 3522112 (1970-07-01), McLain
patent: 5147469 (1992-09-01), Kanzaki et al.

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