The invention discloses a preparing method of a high-electric-
conductivity silver-free
copper alloy. The method comprises following steps: S1,
copper is smelted in a vacuum
smelting furnace, and
argon is inflated; S2, under the
copper melting state at the temperature of 1150 DEG C to 1200 DEG C, 0.5% to 1% of
manganese is added, 0.01% to 0.05% of
cerium and
lanthanum of the
rare earth elements are added, and 0.002% to 0.005% of
lithium is added; the method has the beneficial effects that the silver-free
copper alloy prepared through the method is low in electric resistance, high in electric
conductivity and capable of achieving and being close to the conducting performance of silver; energy is saved, meanwhile, the
alloy can become a new function material which is essential in the field of
electrical conductor grade copper and the future equipment manufacturing industry ; the
alloy can replace silver to be used in part of fields such as
aerospace,
aviation, navigation, submarines and ship manufacturing, military equipment lightweight and the like, high-end electricians, high-end electronic appliances, energy-economic transformers, motors, wind energy,
solar energy, electric locomotives and
new energy electric automobiles; or the alloy can be widely applied in the superconducting field and the like.