WO2017198128A1 - 作为时速400公里以上高速铁路接触线材料应用的超强高导铜合金 - Google Patents

作为时速400公里以上高速铁路接触线材料应用的超强高导铜合金 Download PDF

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WO2017198128A1
WO2017198128A1 PCT/CN2017/084338 CN2017084338W WO2017198128A1 WO 2017198128 A1 WO2017198128 A1 WO 2017198128A1 CN 2017084338 W CN2017084338 W CN 2017084338W WO 2017198128 A1 WO2017198128 A1 WO 2017198128A1
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copper
copper alloy
alloy
solid solution
zirconium
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PCT/CN2017/084338
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French (fr)
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刘嘉斌
徐雨晴
王宏涛
方攸同
孟亮
王立天
田雨
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浙江大学
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Priority to US16/061,027 priority Critical patent/US10801087B2/en
Publication of WO2017198128A1 publication Critical patent/WO2017198128A1/zh

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M1/00—Power supply lines for contact with collector on vehicle
    • B60M1/30—Power rails

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  • the invention relates to a Cu alloy and its application as a high speed railway, especially a high speed railway contact line material with a speed of more than 400 kilometers per hour.
  • the high-speed rail has achieved substantial leap-forward development.
  • the Beijing-Tianjin line, the Beijing-Shanghai line and the Beijing-Guangzhou line have been opened one after another.
  • the high-speed railway has a stable running speed of 300 km/h.
  • the development of high-speed electrified railways has generated huge market demand and demanding performance requirements for its key component, the contact line.
  • the material required for the contact wire has the following characteristics: high strength, low linear density, good electrical conductivity, good abrasion resistance, good corrosion resistance, etc. Especially strength and electrical conductivity are the core indicators.
  • the conductor materials used in the high-speed rail contact line are mainly Cu-Mg, Cu-Sn, Cu-Ag, Cu-Sn-Ag, Cu-Ag-Zr, Cu-Cr-Zr and other series of Cu alloys, among which Cu-Cr-Zr Shows a combination of superior strength and conductivity.
  • the preparations of Cu-(0.02-0.4)% Zr-(0.04-0.16)% Ag and Cu-(0.2-0.72)%Cr-(0.07-0.15)%Ag alloys are disclosed in the patents CN200410060463.3 and CN200510124589.7. technology.
  • the finished product is prepared by processes such as melting, casting, hot deformation, solid solution, cold deformation, aging and cold deformation.
  • Patent CN03135758.X discloses that Cu-(0.01-2.5)% Cr-(0.01-2.0)% Zr-(0.01-2.0)% (Y, La, Sm) is obtained by rapid solidification milling, compacting, sintering and extrusion. The preparation method of the alloy bar or sheet can obtain good electrical conductivity, heat conduction, high temperature and softening resistance.
  • Patent CN200610017523.2 discloses Cu-(0.05-0.40)%Cr-(0.05-0.2)%Zr- ⁇ 0.20% (Ce+Y) alloy composition and preparation technique thereof, through melting, forging, solid solution, deformation and aging High strength, high conductivity and good heat resistance and wear resistance are obtained.
  • Patent CN02148648.4 discloses Cu-(0.01-1.0)%Cr-(0.01-0.6)%Zr-(0.05-1.0)% Zn-(0.01-0.30)% (La+Ce) alloy composition and preparation technology, High strength and electrical conductivity can be obtained by processes such as smelting, hot rolling, solid solution, cold rolling, aging, and finish rolling.
  • the national “13th Five-Year Plan” clearly proposes to build a high-speed railway system with a speed of more than 400 kilometers per hour in 2020.
  • Such demanding performance standards make the current Cu-Mg, Cu-Sn, Cu-Ag, Cu-Sn-Ag, Cu-Ag-Zr, Cu-Cr-Zr alloys unable to meet the high speed of 400 km or more.
  • Railway system requirements for the performance of contact line materials New high-performance alloys must be developed to accommodate the continued rapid development of high-speed rail.
  • the present invention provides a copper alloy containing 3% to 20% by weight of cerium, 0.01% to 1% of chromium, 0.01% to 0.5% of zirconium, 0.01% to 0.2% of titanium, and the balance Copper; the copper alloy exists in the form of long rods or wires, wherein the ruthenium is distributed in the form of nanofibers and solid solution atoms in the copper matrix, and most of the ruthenium nanofibers are arranged approximately parallel in the copper matrix, and these fibers are axially aligned
  • the copper alloy rod or wire is substantially parallel in the axial direction; chromium is distributed around the yttrium fiber and in the copper matrix in the form of nanoparticles and solid solution atoms, and zirconium is distributed around the yttrium fiber in the form of copper zirconium compound nanoparticles and solid solution atoms and copper.
  • titanium is distributed in the copper matrix in the form of copper-titanium GP and solid solution atoms; the total amount of lanthanum, chromium and zirconium solid solution atoms contained in the copper alloy is less than 0.2%; part of the chromium and copper-zirconium compound nanoparticle nails It is tied to the phase interface of the nanofiber and copper matrix.
  • the copper alloy is produced by a preparation method comprising the following steps:
  • the copper alloy is subjected to liquid nitrogen freezing treatment for 12 to 72 hours, and then slowly heated to room temperature, and the temperature rising rate is less than 10 ° C / min to obtain the copper alloy.
  • the intermediate alloy may be Cu-(10% to 25%) Nb intermediate alloy, Cu-(5% to 13%) Cr intermediate alloy, Cu-(5% to 7%) Zr intermediate Alloy, Cu-(3% ⁇ 10%) Ti master alloy Wait.
  • the percentages of the elemental content and the composition of the copper alloy involved in the present invention are both the mass content and the mass percentage.
  • the cooling rate is preferably from 30 to 100 ° C / s.
  • the single drawing deformation amount is 0.1 to 0.2, and finally the 4 to 6 drawing amount is reached.
  • the annealing temperature is preferably 400 to 500 ° C, and the annealing time is preferably 4 to 64 hours.
  • the preparation method consists of steps (1) to (5).
  • the strength of the copper alloy disclosed in the invention reaches 800 MPa or more, the electrical conductivity reaches 78% IACS and the annealing rate at 400 ° C for 2 hours is less than 10%, and the requirements of the high-speed railway system with a speed of 400 km or more are met. Therefore, the present invention further provides the use of the copper alloy as a high speed railway, especially a high speed railway contact line material having a speed of more than 400 kilometers per hour.
  • the copper alloy of the present invention has the following beneficial effects:
  • the high-density nanofiber formed by the Nb element effectively hinders the dislocation motion and produces a huge nanofiber strengthening effect, and improves the overall strength level of the alloy, so that the strength of the copper alloy can reach 800 MPa or more;
  • the fiber axial direction is substantially parallel to the axial direction of the alloy rod or the wire, thereby reducing the scattering of the electron wave at the phase interface, and ensuring that the electrical conductivity of the alloy is maintained at a high level, reaching 78% IACS or more;
  • the nano-particles are pinned on the phase interface between the fiber and the copper matrix to prevent the spheroidization tendency of the nano-fiber during the annealing process, and the alloy has a high anti-softening temperature, so that the annealing rate at 400 ° C for 2 h is less than 10 %.
  • the copper matrix is reinforced by the copper-titanium strip to further enhance the strength of the alloy.
  • the Nb, Cr, Zr and Ti atoms are all dissolved as much as possible to form a precipitated phase, which not only improves the strength of the alloy, but also purifies the copper matrix, reduces the scattering effect of solid solution atoms, and improves the electrical conductivity of the alloy. .
  • Example 1 is a scanning electron micrograph of a microstructure of a copper alloy obtained in Example 2 of the present invention.
  • Example 2 is a result of testing the composition of the copper matrix of the copper alloy obtained in Example 1 of the present invention, and shows that the matrix contains a very small amount of Nb, Zr, Cr elements.
  • the above copper alloy was subjected to liquid nitrogen freezing treatment for 72 hours, and then slowly heated to room temperature, and the temperature rising rate was 5 ° C / min.
  • the tensile strength of the alloy was tested by a standard tensile test, and the room temperature conductivity of the alloy was tested by a standard four-point method.
  • the alloy was subjected to a softening test at 400 ° C for 2 h and the strength reduction rate was tested.
  • the annealed copper alloy was again subjected to room temperature drawing, and the amount of drawing deformation was 0.5.
  • the above copper alloy was subjected to liquid nitrogen freezing treatment for 48 hours, and then slowly heated to room temperature, and the temperature rising rate was 2 ° C / min.
  • the tensile strength of the alloy was tested by a standard tensile test, and the room temperature conductivity of the alloy was tested by a standard four-point method.
  • the alloy was subjected to a softening test at 400 ° C for 2 h and the strength reduction rate was tested.
  • the above copper alloy was subjected to liquid nitrogen freezing treatment for 12 hours, and then slowly heated to room temperature, and the temperature rising rate was 8 ° C / min.
  • the room temperature conductivity of the alloy, the alloy was subjected to a softening test at 400 ° C for 2 h and the strength reduction rate was tested.
  • the alloy obtained in the above examples was tested for the content of Nb, Cr and Zr solid solution atoms in the copper matrix by high resolution energy spectrum.
  • the Ti solid solution atoms could not be distinguished from the copper and titanium GP regions in the energy spectrum, so the content could not be Determination, but reversed from the performance results, its content should be extremely low, the specific results are shown in Table 1.

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Abstract

作为时速400公里以上高速铁路接触线材料应用的超强高导铜合金，该铜合金含有重量百分比为3％～20％的铌，0.01％～1％的铬，0.01％～0.5％的锆，0.01％～0.2％的钛，其余为铜；该铜合金以长条棒或线的形式存在，其中铌以纳米纤维和固溶原子的形式分布在铜基体中，大部分铌纳米纤维在铜基体中近似平行排列，这些纤维轴向与铜合金棒或线轴向大致平行；铬以纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，锆以铜锆化合物纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，钛以铜钛GP区和固溶原子形式分布在铜基体中；铜合金中所包含的铌、铬、锆固溶原子的总量小于0.2％；部分铬和铜锆化合物纳米颗粒钉扎在铌纳米纤维和铜基体的相界面上。

Description

作为时速400公里以上高速铁路接触线材料应用的超强高导铜合金 技术领域：
本发明涉及一种Cu合金及其作为高速铁路尤其是时速400公里以上高速铁路接触线材料的应用。
背景技术：
从2009年起我国高速电气化铁路(以下简称高铁)得到实质的飞跃式发展，京津线、京沪线和京广线相继开通，高铁稳定运行速度为300公里/小时。高速电气化铁路的发展对其关键部件—接触线—产生巨大的市场需求和苛刻的性能要求。要求用作接触线的材料同时具备以下特性：高强度、低线密度、良好的导电性、良好的耐磨擦性、良好的耐腐蚀性等，尤其强度和电导率是最核心指标。
目前高铁接触线采用的导体材料主要有Cu-Mg,Cu-Sn,Cu-Ag,Cu-Sn-Ag,Cu-Ag-Zr,Cu-Cr-Zr等系列Cu合金，其中Cu-Cr-Zr显示了更为优异的强度和电导率综合性能。专利CN200410060463.3及CN200510124589.7公开了Cu-(0.02～0.4)％Zr-(0.04～0.16)％Ag及Cu-(0.2～0.72)％Cr-(0.07～0.15)％Ag两种合金的制备技术。通过熔炼、铸造、热变形、固溶、冷变形、时效及再次冷变形等工艺制备成品。专利CN03135758.X公开了采用快速凝固制粉、压坯、烧结、挤压获得Cu-(0.01～2.5)％Cr-(0.01～2.0)％Zr-(0.01～2.0)％(Y,La,Sm)合金棒材或片材的制备方法，可以获得良好的导电、导热、高温温度及抗软化性能。专利CN200610017523.2公开了Cu-(0.05～0.40)％Cr-(0.05～0.2)％Zr-<0.20％(Ce+Y)合金成分及其制备技术，通过熔炼、锻造、固溶、变形、时效获得高强高导综合性能以及较好的耐热性和耐磨性。专利CN02148648.4公开了Cu-(0.01～1.0)％Cr-(0.01～0.6)％Zr-(0.05～1.0)％Zn-(0.01～0.30)％(La+Ce)合金成分及制备技术，通过熔炼、热轧、固溶、冷轧、时效、终轧等过程可获得较高的强度和电导率。
随着高速电气化铁路的持续发展，国家“十三五”规划明确提出在2020年需建成时速在400公里以上的高速铁路***。这意味着与之相匹配的接触线材料性能也必须提高至强度>680MPa，电导率>78％IACS且400度退火2h强度下降 率<10％水平。如此苛刻的性能标准使得目前所使用的Cu-Mg,Cu-Sn,Cu-Ag,Cu-Sn-Ag,Cu-Ag-Zr,Cu-Cr-Zr合金均无法满足时速在400公里以上的高速铁路***对接触线材料性能的最低要求。必须开发新型高性能合金以适应高铁的持续提速发展。
发明内容：
本发明的目的是提供一种超强高导铜合金及其作为高速铁路尤其是时速在400公里以上的高速铁路接触线材料的应用。
为实现上述发明目的，本发明采用如下技术方案：
本发明提供了一种铜合金，该铜合金含有重量百分比为3％～20％的铌，0.01％～1％的铬，0.01％～0.5％的锆，0.01％～0.2％的钛，其余为铜；该铜合金以长条棒或线的形式存在，其中铌以纳米纤维和固溶原子的形式分布在铜基体中，大部分铌纳米纤维在铜基体中近似平行排列，这些纤维轴向与铜合金棒或线轴向大致平行；铬以纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，锆以铜锆化合物纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，钛以铜钛GP区和固溶原子形式分布在铜基体中；铜合金中所包含的铌、铬、锆固溶原子的总量小于0.2％；部分铬和铜锆化合物纳米颗粒钉扎在铌纳米纤维和铜基体的相界面上。
进一步，所述铜合金通过包括如下步骤的制备方法制得：
(1)以单质和/或中间合金为原料，在真空感应熔炼炉中熔化并快速浇铸于水冷铜模中，冷却速度大于20℃/s；
(2)将步骤(1)所得铸锭在室温下进行多道次拉拔，单次拉拔变形量小于0.3，最终达到3.5以上拉拔变形量；
(3)将拉拔变形的铜合金棒或线于375～575℃退火1～100h；
(4)将退火后的铜合金再次进行室温拉拔，单次拉拔变形量在0.1～0.2之间，拉拔变形量为0.5～1.0；
(5)将上述铜合金置于液氮冷冻处理12～72h，之后缓慢升温到室温，升温速率小于10℃/min，得到所述铜合金。
更进一步，步骤(1)中，中间合金可以是Cu-(10％～25％)Nb中间合金，Cu-(5％～13％)Cr中间合金，Cu-(5％～7％)Zr中间合金，Cu-(3％～10％)Ti中间合金 等。本发明中的所涉及的对于元素含量和铜合金组成的百分含量均为质量含量和质量百分比。
更进一步，步骤(1)中，冷却速度优选为30～100℃/s。
更进一步，步骤(2)中，优选单次拉拔变形量为0.1～0.2，最终达到4～6拉拔量。
更进一步，步骤(3)中，退火温度优选为400～500℃，退火时间优选为4～64h。
更进一步，所述制备方法由步骤(1)～步骤(5)组成。
本发明公开的这种铜合金强度达到800MPa以上，电导率达到78％IACS以上且400℃退火2h强度下降率<10％，达到了时速400公里以上的高速铁路***对接触线材料的要求。故本发明进一步提供了所述铜合金作为高速铁路尤其是时速400公里以上的高速铁路接触线材料的应用。
与现有技术相比，本发明的铜合金具有以下有益效果：
1、本发明利用Nb元素所形成的高密度纳米纤维有效阻碍位错运动而产生巨大的纳米纤维强化效果，提升合金整体强度水平，使得铜合金强度能达到800MPa以上；
2、利用纤维轴向与合金棒或线轴向大致平行，减少电子波在相界面的散射，保证合金电导率保持在较高水平，达到78％IACS以上；
3、利用纳米颗粒钉扎在纤维和铜基体的相界面上，阻止纳米纤维在退火过程中的球化趋势，保障合金具有很高的抗软化温度，使得其400℃退火2h强度下降率<10％。
4、利用铜钛条幅分解整体强化了铜基体，进一步提升合金强度。
5、利用液氮低温处理，使Nb、Cr、Zr、Ti原子均尽可能脱溶，形成沉淀相，既提高了合金强度，又净化了铜基体，减少固溶原子散射效应，提高合金电导率。
附图说明
图1为本发明实施例2所获得的铜合金微观结构的扫描电镜照片。
图2为本发明实施例1所获得的铜合金的铜基体能谱所测试成分结果，表明基体含有极少量的Nb、Zr、Cr元素。
具体实施方式
下面以具体实施例对本发明的技术方案做进一步说明，但本发明的保护范围不限于此：
实施例1：
以纯铜，Cu-25％Nb中间合金，Cu-13％Cr中间合金，Cu-7％Zr中间合金，Cu-10％Ti中间合金为原料，在真空感应熔炼炉中熔化并快速浇铸于水冷铜模中，冷却速度30℃/s，获得Cu-3％Nb-1％Cr-0.5％Zr-0.2％Ti铸锭。将铸锭在室温下进行多道次拉拔，单次拉拔变形量0.15，最终达到5.5拉拔变形量。将拉拔变形的铜合金棒或线于375℃退火100h。将退火后的铜合金再次进行室温拉拔，拉拔变形量为0.5。将上述铜合金置于液氮冷冻处理72h，之后缓慢升温到室温，升温速率5℃/min。采用标准拉伸试验测试合金的抗拉强度，采用标准四点法测试合金的室温电导率，对合金进行400℃退火2h的软化试验并测试强度下降率。
实施例2：
以纯铜，Cu-10％Nb中间合金，Cu-5％Cr中间合金，Cu-5％Zr中间合金，Cu-3％Ti中间合金为原料，在真空感应熔炼炉中熔化并快速浇铸于水冷铜模中，冷却速度50℃/s，获得Cu-10％Nb-0.5％Cr-0.3％Zr-0.1％Ti铸锭。将铸锭在室温下进行多道次拉拔，单次拉拔变形量0.1，最终达到6.0拉拔变形量。将拉拔变形的铜合金棒或线于450℃退火10h。将退火后的铜合金再次进行室温拉拔，拉拔变形量为0.5。将上述铜合金置于液氮冷冻处理48h，之后缓慢升温到室温，升温速率2℃/min。采用标准拉伸试验测试合金的抗拉强度，采用标准四点法测试合金的室温电导率，对合金进行400℃退火2h的软化试验并测试强度下降率。
实施例3：
以纯铜，Cu-20％Nb中间合金，Cu-10％Cr中间合金，Cu-6％Zr中间合金，Cu-5％Ti中间合金为原料，在真空感应熔炼炉中熔化并快速浇铸于水冷铜模中，冷却速度100℃/s，获得Cu-20％Nb-0.1％Cr-0.1％Zr-0.05％Ti铸锭。将铸锭在室温下进行多道次拉拔，单次拉拔变形量0.2，最终达到4拉拔变形量。将拉拔变形的铜合金棒或线于575℃退火1h。将退火后的铜合金再次进行室温拉拔，拉拔变形量为0.5。将上述铜合金置于液氮冷冻处理12h，之后缓慢升温到室温，升温速率8℃/min。采用标准拉伸试验测试合金的抗拉强度，采用标准四点法测试 合金的室温电导率，对合金进行400℃退火2h的软化试验并测试强度下降率。对上述实施例所获得的合金采用高分辨能谱测试铜基体中Nb、Cr和Zr固溶原子的含量，Ti固溶原子由于在能谱中无法与铜钛GP区进行区分，故其含量无法测定，但从性能结果反推，其含量应该极低，具体结果见表1.
表1实施例合金中铜基体Nb、Cr和Zr固溶原子的含量
Figure PCTCN2017084338-appb-000001
表2合金主要性能对比
Figure PCTCN2017084338-appb-000002
*对比合金CuCrZrZnCoTiLa数据来自于专利CN1417357A

Claims (10)

  1. 一种铜合金，其特征在于：该铜合金含有重量百分比为3％～20％的铌，0.01％～1％的铬，0.01％～0.5％的锆，0.01％～0.2％的钛，其余为铜；该铜合金以长条棒或线的形式存在，其中铌以纳米纤维和固溶原子的形式分布在铜基体中，大部分铌纳米纤维在铜基体中近似平行排列，这些纤维轴向与铜合金棒或线轴向大致平行；铬以纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，锆以铜锆化合物纳米颗粒和固溶原子的形式分布在铌纤维周围及铜基体中，钛以铜钛GP区和固溶原子形式分布在铜基体中；铜合金中所包含的铌、铬、锆固溶原子的总量小于0.2％；部分铬和铜锆化合物纳米颗粒钉扎在铌纳米纤维和铜基体的相界面上。
  2. 如权利要求1所述的铜合金，其特征在于：所述铜合金强度达到800MPa以上，电导率达到78％IACS以上且400℃退火2h强度下降率<10％。
  3. 如权利要求1或2所述的铜合金，其特征在于：所述铜合金通过包括如下步骤的制备方法制得：
    (1)以单质和/或中间合金为原料，在真空感应熔炼炉中熔化并快速浇铸于水冷铜模中，冷却速度大于20℃/s；
    (2)将步骤(1)所得铸锭在室温下进行多道次拉拔，单次拉拔变形量小于0.3，最终达到3.5以上拉拔变形量；
    (3)将拉拔变形的铜合金棒或线于375～575℃退火1～100h；
    (4)将退火后的铜合金再次进行室温拉拔，单次拉拔变形量在0.1～0.2之间，拉拔变形量为0.5～1.0；
    (5)将上述铜合金置于液氮冷冻处理12～72h，之后缓慢升温到室温，升温速率小于10℃/min，得到所述铜合金。
  4. 如权利要求3所述的铜合金，其特征在于：步骤(1)中，中间合金是Cu-(10％～25％)Nb中间合金，Cu-(5％～13％)Cr中间合金，Cu-(5％～7％)Zr中间合金，Cu-(3％～10％)Ti中间合金中的一种或几种。
  5. 如权利要求3所述的铜合金，其特征在于：步骤(1)中，冷却速度为30～100℃/s。
  6. 如权利要求3所述的铜合金，其特征在于：步骤(2)中，单次拉拔变形量为0.1～0.2，最终达到4～6拉拔量。
  7. 如权利要求3所述的铜合金，其特征在于：步骤(3)中，退火温度为400～500℃，退火时间为4～64h。
  8. 如权利要求3所述的铜合金，其特征在于：所述制备方法由步骤(1)～步骤(5)组成。
  9. 如权利要求1所述的铜合金作为高速铁路接触线材料的应用。
  10. 如权利要求9所述的应用，其特征在于：所述高速铁路时速在400公里以上。
PCT/CN2017/084338 2016-05-16 2017-05-15 作为时速400公里以上高速铁路接触线材料应用的超强高导铜合金 WO2017198128A1 (zh)

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CN106676313B (zh) * 2016-12-28 2018-07-17 北京有色金属研究总院 一种高强度高导电性能Cu-Nb合金坯料的制备方法
CN111575525A (zh) * 2020-04-16 2020-08-25 陕西斯瑞新材料股份有限公司 一种电气化铁路用Cu-Cr-Zr合金接触线的制造方法
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