Low-alloying copper belt and preparation method thereof

Abstract

The invention relates to a low-alloying copper belt and further relates to a preparation method of the low-alloying copper belt. The low-alloying copper belt is characterized by including the following components of, by weight, 0.3-1.2 parts of Sn, 0.1-1.5 parts of Zn, 0.5-2.0 parts of Ni, 0.03-0.2 part of Po, 0-0.1 part of Fe and 93-99 parts of Cu. In the low-alloying copper belt, the Sn, Ni, Zn and P of low contents are subjected to solid solution treatment and exist in a matrix in a solid solution mode, and meanwhile part of the Ni and P form second-phase phosphide, that is, nickel phosphide, so that strength and the stress relaxation resistant performance of materials are improved, and the materials have high elasticity and conductivity; besides, the proportional relation between contents of the Sn, Ni and Zn is good for improvement of intensity and elasticity of the materials, the strengthening effect is not apparent when the contents of the Sn, Ni and Zn are too low, and the material conductivity is reduced seriously when the contents of the Sn, Ni and Zn are too high; compound hard particles separate out from the Ni and P in the low-alloying copper belt, so that the material elasticity is improved.

Description

technical field [0001] The invention relates to the technical field of low-alloyed copper strips used for automobile terminals, specifically a low-alloyed copper strip with high elasticity and high conductivity, and also relates to a preparation method of the low-alloyed copper strip. Background technique [0002] Tin phosphor bronze is a commonly used elastic alloy. The alloy can obtain better mechanical properties through the action of Sn-P elements and cold work hardening. It has the characteristics of corrosion resistance, wear resistance, non-magnetic properties and excellent elastic properties. It also has high Elongation, easy to process and punch into elastic elements of various complex shapes, it is the elastic material with the largest amount and the widest application among copper-based elastic alloy materials. [0003] Chinese invention patent application with publication number CN104152742A "A high-performance tin-phosphorus bronze wire and its production method...

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Problems solved by technology

[0003] Chinese invention patent application with publication number CN104152742A "A high-performance tin-phosphorus bronze wire and its production method" (application number: CN201410448856.5), and Chinese invention patent application with publication number CN102259252A "A high-elastic tin-phosphorus bronze alloy "Preparation Method of Foil" (Application No.: CN201110171904.7) and others have disclosed the preparation method of tin phosphor bronze material. At present, in the composition ratio of commonly used tin phosphor bronze, the tin content is generally 4-9%, and the phosphorus content is 0.1 to 0.2%, such a ratio leads to high cost of tin phosphor bronze material and low conductivity, the conductivity is only 11% to 19% IACS, which cannot meet the high conductivity requirements of connectors used in automotive terminals and their high-end products. Require

[0004] In the Chinese invention patent application "A high-elasticity low-cost tin-phosphorus bronze alloy strip and its preparation method" with the application number CN201510275343.3, the tin content is 0.5-2.5wt%, the nickel content is 0-1.0wt%, and the phosphorus content is 0.05~0.5wt%, the conductivity of this alloy can reach 20%, but the conductivity is still too low to be suitable for connectors used in automotive terminals or high-end products

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