Copper-nickel-silicon-chromium alloy having improved electrical

Details Copper-nickel-silicon-chromium alloy having improved electrical Copper-nickel-silicon-chromium alloy having improved electrical

1979-07-02

1981-04-07

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

75159, 75160, C21D 100, C22F 108

Patent

active

042604354

ABSTRACT:
A copper-nickel-silicon-chromium alloy having a high hardness and improved electrical conductivity. The alloy is composed by weight of 2.0% to 3.0% nickel, 0.4% to 0.8% silicon, 0.1% to 0.5% chromium, and the balance copper. The silicon is used in excess of the stoichiometric relationship with nickel to provide excess silicon, and the chromium is used in excess of the stoichiometric relationship with the excess silicon. The alloy is heat treated by initially heating the alloy to a temperature in the range of 1600.degree. F. to 1800.degree. F. and is thereafter quenched. The quenched alloy is then subjected to a two-step aging treatment in which the alloy is initially aged at a temperature of 900.degree. F. to 1100.degree. F. to precipitate the metal silicides and develop a hardness in excess of 90 Rockwell B (185 Brinell) and subsequently is subjected to a second aging at a temperature in the range of 750.degree. F. to 900.degree. F., which serves to precipitate the excess chromium from solution and increase the electrical conductivity to a value greater than 45%.

REFERENCES:
patent: 1658186 (1928-02-01), Corson
patent: 1763303 (1930-06-01), Graham
patent: 1778668 (1930-10-01), Fuller
patent: 3072508 (1963-01-01), Klement et al.

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