Copper-based electric and electronic parts having high strength

Details Copper-based electric and electronic parts having high strength Copper-based electric and electronic parts having high strength

1991-12-16

1993-04-27

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148432, 420469, 420496, C22C 906

Patent

active

052058786

ABSTRACT:
Electric and electronic parts, including leadframes made of a copper-based alloy having high strength and high electric conductivity said copper-based alloy is produced by a process which comprises the steps of preparing a copper-based alloy consisting essentially of 0.01-3.0 wt % Co and 0.01-0.5 wt % P with the balance being Cu and incidental impurities, quenching said alloy from a temperature not lower than 750.degree. C. down to 450.degree. C. and below at a cooling rate of at least 1.degree. C./sec, heat treating the quenched alloy at a temperature of 480.degree.-600.degree. C. for 30-600 minutes, cold working said alloy for a working ratio of 20-80%, further heat treating the alloy at a temperature of 440.degree.-470.degree. C. for 30-600 minutes, and subsequently performing cold working for a working ratio of at least 50% and heat treatment at 380.degree. C. and below. The electric and electronic parts preferably contain a plurality of conductive leads.

REFERENCES:
patent: 4612167 (1986-09-01), Watanabe et al.

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