A kind of copper-nickel-tin alloy and its preparation method and application

Abstract

A copper-nickel-tin alloy and its preparation method and application, the weight percentage composition of the alloy comprises: Ni8-16%, Sn5-9%, X1 element 0.1-1.0%, X2 element 0.1-0.5%, wherein X1 is selected from Ti , at least one of Si, Al, V, X2 is selected from at least one of Mn, Zn, Mo, and the remainder is Cu and inevitable impurities; the copper alloy of the present invention is strengthened by precipitation, microalloying and semi-continuous The combination of casting and electromagnetic stirring suppresses the segregation of Sn elements, controls the Sn element concentration difference from the core to the surface layer of the copper alloy ingot within 2%, the hardness difference within 10HV, and the hardness deviation in different directions is controlled within 5%. . The alloy ingot can be processed into rods, wires, plates, strips, tubes and other forms, with tensile strength ≥1100MPa, yield strength ≥1050MPa, elongation ≥5%, and can be used in aerospace, energy mining, intelligent molding, etc. field.

Description

technical field [0001] The invention relates to the technical field of copper-nickel-tin alloys, in particular to a copper-nickel-tin alloy with high strength, high hardness and good corrosion resistance and a preparation method and application thereof. The copper-nickel-tin alloy can be applied to aerospace , energy mining, intelligent molding and other fields. Background technique [0002] For a long time, precipitation-hardening alloy beryllium bronze has been widely used in bearing sleeve materials because of its high strength, excellent thermal conductivity, wear and corrosion resistance and good anti-adhesion. However, such alloys have disadvantages such as high cost, complex production process, easy cracking and brittle fracture, and serious pollution, especially beryllium oxide and dust are toxic, which will seriously endanger human health and pollute the environment, and beryllium bronze should not be used in high It works for a long time under the temperature, and...

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Problems solved by technology

[0004] However, CuNiSn alloy has serious macro reverse segregation problems in the production process, and there is a large concentration difference from the core to the surface of the ingot. Especially in the case of mass production, the uniformity of the alloy structure is extremely difficult to control. In addition, the CuNiSn alloy The deformation heat treatment is very difficult to process, and the material forming and processing are difficult

Therefore, at present, the alloy is mostly in the laboratory research stage in China, and it is not yet possible to carry out mass production.

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