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High-performance CuNiSiTiBMg-series elastic copper alloy and preparation method thereof

An elastic copper alloy, high-performance technology, applied in the field of elastic alloy and its preparation, can solve the problems of difficulty in realization, insufficient plasticity, low plasticity requirements, etc., and achieve improved stress relaxation resistance, enhanced grain boundary strengthening, and tensile strength increased effect

Active Publication Date: 2018-11-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Elastic copper alloy is the key material for conductive elastic devices. When it is used in ships, aerospace, electrical and electronics, machine instruments, automobile industry, rail transportation, ocean transportation and other fields, it requires high performance, including tensile strength. The strength is greater than 1100MPa, the elongation is greater than 8%, and the electrical conductivity is greater than 20% IACS, etc.; although the elastic copper alloy prepared by traditional process steps such as melting and casting, hot rolling, solid solution, and cold rolling has high strength and good electrical conductivity , but the plasticity is not enough to meet the needs of the current industry
[0003] In recent years, research on the performance improvement of elastic copper alloys has made some progress, but there are still some shortcomings, such as limited mechanical properties or deformable processing of the alloy, and there are problems of high cost pressure and low economic benefits in production. Meet the application requirements of industrial production:
[0004] (1) The published Chinese patent "Ultra-high-strength, high-conductivity CuNiSiSnMg-based elastic copper alloy and its preparation method" (200810032004.2) provides a CuNiSiSnMgZr alloy with ultra-high strength, good electrical conductivity and excellent resistance to stress relaxation performance, but there are some deficiencies in its preparation process, such as the serious segregation of the ingot due to the addition of Sn element, which requires a long time for homogenization treatment; it is difficult to control the heating rate in the two-stage solution treatment process, and it is difficult to realize large; and the non-vacuum secondary remelting process is difficult to produce on a large scale and industrially
[0005] (2) Chinese patent "Cu-Ni-Si-Mg alloy with improved electrical conductivity and bendability" (201080002157.8) discloses a Cu-Ni-Si-Mg alloy containing 1.0-4.5% Ni, 0.16-0.13% of Si and 0.05-0.3% of Mg, more preferably 0.01-2.0% by mass of Cr, P, Mn, Ag, Co, Mo, As, Sb, Al, Hf, Zr, C, Fe , At least one of In, Ta, Sn, Zn, the number of Ni-Si compounds contained in the alloy is small, and the precipitated phase is only Ni 2 Si is the main type, the volume fraction of the precipitated phase is limited and the size of the precipitated phase is easy to grow, some of the precipitated phases reach 0.05-3.0 microns, and the effect of Orowan strengthening on the precipitated phase particles above 0.05 microns is significantly reduced, so The strengthening ability of this alloy is limited, and the tensile strength of the alloy is only 760-801MPa, which is only a medium-strength copper alloy.
[0006] (3) The Chinese patent "A CuNiSi-based Elastic Copper Alloy and Its Preparation Method" (201310025570.1) discloses a Cu-Ni-Si-based elastic copper alloy in which the content of Ni and Si is low (Ni is 3.8-5.0 %, Si is 0.6-1.3%), the number of Ni-Si compounds formed is small, and the volume fraction of the precipitated phase is low so that the strengthening effect is limited
This process significantly shortens the traditional process flow, but the multi-pass cold rolling in this process is mainly to reduce the thickness of the sample, prepare the shape and size for the subsequent aging treatment of the strip, and has limited strengthening of the alloy; and the process is only It is suitable for the production of medium-strength conductive Cu-Ni-Si alloy (C70250) and Cu-Cr-Zr alloy (C70350) with low precipitate content and excellent cold rolling performance, or some require high strength but low plasticity requirements ( Generally less than 6%) copper alloy products

Method used

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  • High-performance CuNiSiTiBMg-series elastic copper alloy and preparation method thereof
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  • High-performance CuNiSiTiBMg-series elastic copper alloy and preparation method thereof

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Embodiment 1

[0040] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention, in weight percent, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.0%, Si 2.0%, Ti 1.0%, B0.1%, Mg 0.2%, the rest is Cu and unavoidable impurities.

[0041] The preparation method of the high-performance CuNiSiTiBMg system elastic copper alloy of the present embodiment comprises the following steps:

[0042] (1) Prepare materials according to the weight percentage of the constituent elements in the high-performance CuNiSiTiBMg-based elastic copper alloy. Put electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace for melting at a melting temperature of 1250 ° C. After they are completely melted , lower the temperature to 1250°C, then add pure magnesium, and form an alloy melt after melting;

[0043] (2) The alloy melt is continuously cast into a slab on a continuous casting machin...

Embodiment 2

[0052] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention, in weight percent, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.2%, Si 2.2%, Ti 1.2%, B0.3%, Mg 0.24%, the rest is Cu and unavoidable impurities.

[0053] The preparation method of the high-performance CuNiSiTiBMg system elastic copper alloy of the present embodiment comprises the following steps:

[0054] (1) Prepare materials according to the weight percentage of the constituent elements in the high-performance CuNiSiTiBMg-based elastic copper alloy. Put electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace for melting at a melting temperature of 1250 ° C. After they are completely melted , lower the temperature to 1250°C, then add copper-boron intermediate alloy and pure magnesium, and form an alloy melt after melting;

[0055] (2) The alloy melt is continuously cast into ...

Embodiment 3

[0064] A high-performance CuNiSiTiBMg-based elastic copper alloy of the present invention, in weight percent, the high-performance CuNiSiTiBMg-based elastic copper alloy contains the following components: Ni 8.8%, Si 2.1%, Ti 1.0%, B0.1%, Mg 0.25%, the rest is Cu and unavoidable impurities.

[0065] The preparation method of the high-performance CuNiSiTiBMg system elastic copper alloy of the present embodiment comprises the following steps:

[0066] (1) Prepare materials according to the weight percentage of the constituent elements in the high-performance CuNiSiTiBMg-based elastic copper alloy. Put electrolytic copper, electrolytic nickel, electrolytic silicon and electrolytic titanium into a heating furnace for melting at a melting temperature of 1250 ° C. After they are completely melted , lower the temperature to 1200°C, then add copper-boron intermediate alloy and pure magnesium, and form an alloy melt after melting;

[0067] (2) The alloy melt is continuously cast into ...

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Abstract

The invention provides a high-performance CuNiSiTiBMg-series elastic copper alloy and a preparation method of the high-performance CuNiSiTiBMg-series elastic copper alloy. The high-performance CuNiSiTiBMg-series elastic copper alloy comprises the ingredients of, in percentage by weight, 8.0-12.0% of Ni, 2.0-3.0% of Si, 0.5-2.0% of Ti, 0.02-0.5% of B, 0.2-0.3% of Mg and the balance Cu and inevitable impurities. The elastic copper alloy is reasonable in ingredient, strengthening phases in the alloy are uniformly distributed, and the high-performance CuNiSiTiBMg-series elastic copper alloy has the characteristics of being high in strength, good in plasticity, high in specific conductance and excellent in stress relaxation resistance. The preparation method of the elastic copper alloy comprises the steps of continuous casting and rolling, hot rolling, solution treatment, cold rolling, aging treatment, multiple times of pack rolling, low tempering and the like. The preparation method has the characteristics that energy is saved, consumption is lowered, the production cost is lower, and the process is simpler, and the preparation method is more suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of elastic alloys and their preparation, in particular to a high-performance CuNiSiTiBMg-based elastic copper alloy and a preparation method thereof. Background technique [0002] Elastic copper alloy is the key material for conductive elastic devices. When it is used in ships, aerospace, electrical and electronics, machine instruments, automobile industry, rail transportation, ocean transportation and other fields, it requires high performance, including tensile strength. The strength is greater than 1100MPa, the elongation is greater than 8%, and the electrical conductivity is greater than 20% IACS, etc.; although the elastic copper alloy prepared by traditional process steps such as melting and casting, hot rolling, solid solution, and cold rolling has high strength and good electrical conductivity , but the plasticity is not enough to meet the needs of the current industry. [0003] In recent years, res...

Claims

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Application Information

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IPC IPC(8): C22C9/06C22C1/03C22F1/08
CPCC22C1/03C22C9/06C22F1/08
Inventor 雷前蒋栋李圣尧李云平李周
Owner CENT SOUTH UNIV
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