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Preparation method of Cr2Nb phase-containing high-strength high-conductivity high-temperature-resistant copper alloy

A technology of copper alloy and high temperature resistance, which is applied in the field of preparation of high-strength, high-conductivity and high-temperature-resistant copper alloys. It can solve problems such as the inability to prepare samples with complex shapes, the inability to apply high-temperature fields, and affect the strengthening effect, so as to improve the effect of dispersion strengthening and high temperature resistance. Excellent performance and easy to generate effects

Active Publication Date: 2020-08-14
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the existing technology has the following technical shortcomings: first, only relying on the precipitated phase of solid solution aging for strengthening, which cannot be applied in the high temperature field; second, in the ingot preparation process, the structure is coarse, which is likely to cause insufficient solid solution and affect the strengthening effect; third, limited by the process conditions, it is impossible to prepare samples with complex shapes

Method used

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  • Preparation method of Cr2Nb phase-containing high-strength high-conductivity high-temperature-resistant copper alloy
  • Preparation method of Cr2Nb phase-containing high-strength high-conductivity high-temperature-resistant copper alloy
  • Preparation method of Cr2Nb phase-containing high-strength high-conductivity high-temperature-resistant copper alloy

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Embodiment 1

[0037] A method for preparing a high-strength, high-conductivity, high-temperature-resistant copper alloy containing Cr2Nb phase, comprising the following steps:

[0038] (1) Ingredients: Proportioning copper alloy elements is carried out according to the percentage by weight that Cr is 2.2%, Zr content is 0.6%, Nb content is 1.1%, and Cu is the balance, selects and takes corresponding raw materials; Cu is an electrolytic copper plate with a purity of ≥99.990%, Zr is crystalline Zr with a purity of ≥99.9%, Cr is Cr powder with a purity of ≥99.9% and a particle size of 50-90 μm, and Nb is made of a purity of ≥99.5% with a particle size of 10-20μm Nb powder;

[0039] (2) Atomized powder making: the raw materials are refined and prefabricated into alloy ingots, and the alloy ingots are smelted into alloy liquid by using crucible melting, and then the alloy liquid is passed through the bottom of the tundish by vacuum induction gas atomization method The conduit flows to the atomi...

Embodiment 2

[0044] This embodiment is basically the same as Embodiment 1, the difference is:

[0045] In step (1), the proportioning of copper alloy elements is carried out according to the percentage by weight of 0.6% of Cr, 0.1% of Zr, 0.3% of Nb and Cu as the balance.

[0046] In step (2), electrode induction gas atomization is used for atomization powder production. Under suitable vacuum conditions and protective gas conditions, the refined and prefabricated copper alloy ingots are regionally melted, and the metal liquid flows vertically through the nozzles continuously. The metal liquid is atomized and broken into a large number of fine droplets by the high-pressure airflow through the close-coupled nozzle, and the fine droplets solidify into particles in flight, that is, the Cr 2 Spherical powder of Nb phase.

[0047] The 3D printing in step (3) uses electron beams as energy beams to 3D print the raw materials, the scanning speed of the electron beams is 0.35m / s, and the beam curre...

Embodiment 3

[0049] This embodiment is basically the same as Embodiment 1, the difference is:

[0050] In the step (1), the ingredients are proportioned to the copper alloy elements according to the weight percentages of 4% Cr, 1% Zr, 2% Nb and Cu as the balance.

[0051] The 3D printing in step (3) uses a plasma beam as an energy beam to 3D print the raw material, and the power of the plasma beam is 50kW.

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Abstract

The invention discloses a preparation method of a Cr2Nb phase-containing high-strength high-conductivity high-temperature-resistant copper alloy, and belongs to the technical field of copper alloy preparation. The preparation method comprises the following steps that an Nb element is introduced on the basis of a traditional chromium-zirconium-copper material, and Nb powder and Cr powder are fullyactivated before ingot casting to obtain an unbalanced supersaturated solid solution, so that a Cr2Nb phase is easier to form in a copper alloy cast ingot. According to the preparation method, a process of combining atomization powder preparation and 3D printing is adopted, and low-temperature argon high-pressure cold air flow is adopted for carrying out cold casting treatment on metal liquid drops in the atomization powder preparation process, so that it is guaranteed that the Cr2Nb phase is fine and is in a sufficient supersaturated state, and the dispersion strengthening effect of a precipitated phase is improved; and the advantages of 3D printing are fully utilized, parts in complex shapes can be prepared, and the prepared parts have the advantages of being high in strength and excellent in high-temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of copper alloy preparation, in particular to a 2 The invention discloses a preparation method of a high-strength, high-conductivity, high-temperature-resistant copper alloy of Nb phase. Background technique [0002] Copper-chromium-zirconium materials are mainly used in industries such as high-speed rail transit, welding engineering, metallurgy, electric power, and lead frame materials due to their high-strength and high-conductivity properties. The current conventional production process is to improve the mechanical properties of the material through the heat treatment of solid solution aging and the precipitation strengthening of two elements, Cr and Zr. Therefore, the high strength and high conductivity of this material are limited by temperature, and its softening temperature It is about 550°C, so the application field of this material is limited, and conventional copper-chromium-zirconium is prepared ...

Claims

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Application Information

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IPC IPC(8): C22C1/04B22F9/08C22B9/22C22F1/08C22C9/00B33Y10/00B33Y70/00
CPCB22F9/082B22F2009/0876B33Y70/00C22B9/228C22C1/0425C22C9/00C22F1/08Y02P10/25
Inventor 张石松王小军刘凯李鹏姚培建马明月师晓云赵俊王文斌李刚
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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