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CN-121976085-A - High-temperature creep-resistant chromium-zirconium-copper alloy and preparation method thereof

CN121976085ACN 121976085 ACN121976085 ACN 121976085ACN-121976085-A

Abstract

The invention discloses a chromium-zirconium-copper alloy resistant to high-temperature creep, which comprises 0.4-1.5 wt% of Cr, 0.01-0.15 wt% of Zr, 0.01-0.20 wt% of Nb, and the balance of Cu and unavoidable impurities, wherein the mass ratio of Nb to Cr is 0.05-0.15, and the average grain size of the chromium-zirconium-copper alloy is 0.01-0.10 mm. The chromium-zirconium-copper alloy has higher high-temperature creep resistance. The invention also discloses a preparation method and application of the chromium-zirconium-copper alloy resistant to high-temperature creep.

Inventors

  • ZHENG LIANGYU
  • XIANG YANLONG
  • HUA CHENGWEN
  • FU JIE
  • CUI HAIFENG
  • WANG YONGRU

Assignees

  • 宁波金田铜业(集团)股份有限公司

Dates

Publication Date
20260505
Application Date
20260331

Claims (10)

  1. 1. The chromium-zirconium-copper alloy resistant to high-temperature creep is characterized by comprising 0.4-1.5 wt% of Cr, 0.01-0.15 wt% of Zr, 0.01-0.20 wt% of Nb, and the balance of Cu and unavoidable impurities, wherein the mass ratio of Nb to Cr is 0.05-0.15; The average grain size of the chromium-zirconium-copper alloy is 0.01-0.10 mm.
  2. 2. The high temperature creep resistant chromium-zirconium-copper alloy according to claim 1, wherein the structure of the chromium-zirconium-copper alloy comprises Cr simple substance and a second phase, the second phase comprising Cr 2 Nb and niobium-zirconium intermetallic compound, the average size of the Cr simple substance being 5 μm or less, the average size of the second phase being 0.5 μm or less, the distribution of the second phase being 1 x 10 4 ~2×10 5 /mm 2 .
  3. 3. The high-temperature creep resistant chromium-zirconium-copper alloy according to claim 1, wherein the components of the chromium-zirconium-copper alloy further comprise 0.0001-0.1 wt% of Ni, 0.0001-0.1 wt% of Al, and less than or equal to 50ppm of O.
  4. 4. The high-temperature creep resistant chromium-zirconium-copper alloy according to claim 3, wherein the mass ratio of Nb to (Cr+Zr+Ni+Al) is 0.05 to 0.2.
  5. 5. The high temperature creep resistant chromium-zirconium-copper alloy according to claim 3 or 4, wherein the mass ratio of Al to Ni is 0.1 to 1.0.
  6. 6. A chromium zirconium copper alloy resistant to high temperature creep according to claim 3, wherein the second phase further comprises Ni 3 Nb and niobium aluminum intermetallic compounds.
  7. 7. A method for preparing the chromium-zirconium-copper alloy resistant to high temperature creep according to any one of claims 1 to 6, wherein the preparation method comprises the following process flows of batching, semi-continuous casting, hot working, solid solution, cold rolling, cold drawing and finished product aging annealing; proportioning according to the component content of the chromium-zirconium-copper alloy resistant to high temperature creep; the temperature of the hot working is 960-1000 ℃.
  8. 8. A method for producing a chromium-zirconium-copper alloy resistant to high temperature creep according to claim 7, wherein the cold rolling is performed at a reduction ratio of 80% or more.
  9. 9. A method of preparing a chromium zirconium copper alloy resistant to high temperature creep according to claim 7, wherein the final product is aged annealed at a temperature of 350-450 ℃.
  10. 10. Use of a chromium-zirconium-copper alloy according to any one of claims 1-6 for aerospace and nuclear fusion applications.

Description

High-temperature creep-resistant chromium-zirconium-copper alloy and preparation method thereof Technical Field The invention relates to the field of copper alloy, in particular to a chromium-zirconium-copper alloy with good high-temperature creep resistance, a preparation method and application thereof. Background The chromium-zirconium-copper alloy has high strength and high conductivity, is widely applied to high-end manufacturing industries such as high-speed railway contact wires, power battery lugs, photovoltaic energy storage, humanoid robots and the like, and has extremely strong application prospects in aerospace and nuclear fusion devices, but also provides 600 ℃ high-temperature creep resistance for the chromium-zirconium-copper alloy due to the working environment characteristics. Aiming at the high-temperature performance of chromium, zirconium and copper, a certain improvement method is also provided in part of patents, for example, chinese patent literature with publication number CN 112030031B discloses a copper alloy material, a preparation method and application thereof, through the synergistic effect between Cr, ag, cu, nb, zr and RE in the copper alloy material, wherein the tensile strength of the copper alloy material is 350-420MPa under 785K (509.85 ℃) due to the fact that Cr 2.0-7.0%, nb 1.0-5.0%, ag 0.1-2.0%, zr 0.1-0.7%, RE 0.02-0.3% and the balance Cu, the RE comprises the following components, by mass percent, la 88-9%, ce 6-9%, P r 1.5.5-1.9% and Nd less than or equal to 0.3%, and the heat conduction performance, the high-temperature creep property, the high-temperature strength and the high-temperature fatigue of the copper alloy material can be effectively improved, but the tensile strength of the copper alloy material can only be prepared through vacuum casting and plasma rotary atomizing in a protective atmosphere due to the fact that Nb and other high-melting elements are excessively added. Another chinese patent publication No. CN 112695219A discloses a method for improving strength and conductivity of a smelting cast Cu-Cr-Nb alloy, in which Nb content is 0.1 to 1.0%, and 0.1 to 0.5% of a micro-alloying element M (M is composed of at least four elements of RE, ag, B, P, si, ca, li, mg, ti, fe, zr, mn and RE is selected from at least one of Ce, la, Y, pr, nd, sm, sc, gd, dy) is added, and a large-size high-strength high-conductivity Cu-Cr-Nb-M alloy having a fine structure and a uniform composition is prepared by smelting, casting and a thermomechanical treatment process, so that strength and conductivity are achieved, and the purpose of the patent is only to improve strength and conductivity, but not to be related to high-temperature characteristics of the chromium-zirconium-copper alloy. Therefore, in view of the above-mentioned shortcomings of the prior art, there is a need to find a chromium-zirconium-copper alloy with low Nb content and good high temperature creep resistance, which is suitable for the field of aerospace and nuclear fusion devices with high temperature operation requirements. Disclosure of Invention The invention provides a chromium-zirconium-copper alloy which has higher high-temperature creep resistance. The invention provides a chromium-zirconium-copper alloy resistant to high-temperature creep, which comprises 0.4-1.5 wt% of Cr, 0.01-0.15 wt% of Zr, 0.01-0.20 wt% of Nb, and the balance of Cu and unavoidable impurities, wherein the mass ratio of Nb to Cr is 0.05-0.15; The average grain size of the chromium-zirconium-copper alloy is 0.01-0.10 mm. The invention provides the following elements: the Cr element provided by the invention is used as a main alloy element of the chromium-zirconium-copper alloy, is one element for improving the high-temperature creep property of the alloy, a proper amount of Cr element can form a fine Cr 2 Nb second phase with Nb element, the high-temperature creep resistance of the alloy is further improved, excessive Cr element cannot be added, or the Cr element is easy to gather to form a coarse Cr simple substance phase, so that a stress concentration point of a local area material is formed. The invention provides a proper amount of Zr element, which can greatly improve the ageing strengthening property of chromium-zirconium-copper alloy, improve the strength of the material, promote the precipitation of a second phase, improve the conductivity, and simultaneously form a stable niobium-zirconium intermetallic compound at high temperature, has good neutron absorption performance, and is suitable for nuclear reactor control materials. The Nb element provided by the invention can be combined with Cr and Zr elements of the chromium-zirconium-copper alloy at the same time, so that the high-temperature creep resistance of the material is obviously improved, but the content of the Nb element cannot be excessive, once the addition amount is excessive, the strength is reduced due to excessive simple substance Nb, the size and unif