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CN-122000707-A - Medium-high entropy alloy superconducting joint of superconducting cable and preparation method and application thereof

CN122000707ACN 122000707 ACN122000707 ACN 122000707ACN-122000707-A

Abstract

The invention discloses a medium-high entropy alloy superconducting joint of a superconducting cable, a preparation method and application thereof, wherein the medium-high entropy alloy superconducting joint is prepared from medium-entropy alloy of 3-4 metal elements or high-entropy alloy of more than 5 metal elements. The invention introduces the medium-high entropy alloy as a core material into the superconducting joint structure, and directly improves the joint performance through the unique material characteristics.

Inventors

  • SANG LINA
  • CAO WENQING
  • ZHAO JINSHI
  • MA SHIHUI
  • WANG QI
  • CHEN LIPIN

Assignees

  • 天津理工大学

Dates

Publication Date
20260508
Application Date
20260213

Claims (10)

  1. 1. The medium-high entropy alloy superconducting joint of the superconducting cable is characterized in that the medium-high entropy alloy superconducting joint is prepared by medium-entropy alloy of 3-4 elements or high entropy alloy of more than 5 elements.
  2. 2. The medium and high entropy alloy superconducting joint according to claim 1, wherein the element comprises Li, be, B, C, N, mg, al, zn, nb, co, fe, cu, mn, ti, V, ta, cr, V, zr, hf, ta, mo, W, sc or Sn.
  3. 3. The medium-high entropy alloy superconducting joint according to claim 1, wherein the medium-entropy alloy is Hf a Nb b Zr c Ti d 、Ta a Nb b Hf c Zr d or Nb a Sc b Hf c Zr d ,Ti a Nb b Ta c N d ,Fe a Ni b Co c Cr d , wherein 5≤a, b, c, d≤35, and a+b+c+d=100.
  4. 4. The medium-high entropy alloy superconducting joint according to claim 1, wherein the high entropy alloy is Hf a Nb b Ti c V d Zr e 、(ScZrNb) 1-x [RhPd] x 、Ta a Nb b Hf c Zr d Ti e 、Hf a Ta b Nb c Mo d W e or Nb a Re b Hf c Zr d Ti e , wherein 5≤a, b, c, d, e≤35, and a+b+c+d+e= 100,0.3≤x≤0.4.
  5. 5. The medium-high entropy alloy superconducting joint according to claim 1, wherein the medium-high entropy alloy superconducting joint is in the form of a sheet or a block, and the sheet or the block is grown by an arc melting method or a laser suspension zone furnace.
  6. 6. The method for preparing the medium-high entropy alloy superconducting joint according to any one of claims 1 to 5, comprising the following steps: And uniformly mixing 3-4 elements or more than 5 elements in an argon atmosphere, cold isostatic pressing into a blank rod, sintering, and performing crystal growth by adopting a laser suspension zone melting furnace to obtain the medium-high entropy alloy superconducting joint.
  7. 7. The method according to claim 5, wherein the cold isostatic pressing is performed at 160-200 MPa.
  8. 8. The method according to claim 5, wherein the conditions for crystal growth are that crystal growth is performed at a growth rate of 3 to 6 mm/h, a rotation rate of 15 to 20 rpm, and a growth temperature of 1400 to 1500 ℃.
  9. 9. Use of a medium-high entropy alloy superconducting joint according to any one of claims 1-5 in connection of superconducting tapes, in series connection of superconducting magnets or in forming a closed loop operation of superconducting magnet coils.
  10. 10. Use according to claim 9, characterized in that the medium-high entropy alloy superconducting joint is placed between the ends of two segments of superconducting tape, connected by metallurgical chemical reactions.

Description

Medium-high entropy alloy superconducting joint of superconducting cable and preparation method and application thereof Technical Field The invention relates to the technical field of superconducting materials, in particular to a medium-high entropy alloy superconducting joint of a superconducting cable, a preparation method and application thereof. Background Superconducting cables have the great advantages of low loss and large capacity in the field of power transmission. In practice, long distance superconducting cables require multiple segments of cable to be connected by intermediate joints. The performance of the joint directly determines the efficiency and reliability of the overall cable system. An ideal superconducting joint should have low electrical resistance, high mechanical strength, and long-term operational stability similar to that of the superconducting tape body. Currently, superconducting cable intermediate joints typically use conventional metals (such as tin, indium, lead, and alloys thereof) as the solder to join the superconducting tapes by welding or crimping. However, these conventional materials suffer from the following inherent drawbacks: 1. Conventional superconducting joints often use Pb-Bi alloy and Wood's metal or other solders, which contain lead and cadmium elements, which are harmful to the environment. 2. Conventional metals are not superconductors themselves, and introduce additional resistance at the joint, resulting in energy loss and localized heating. 3. Soft metals such as tin, indium and the like have lower strength, and are easy to creep or deform under the action of thermal cycle and electromagnetic force, so that the contact pressure is reduced, and the joint resistance is increased or even fails. 4. The critical magnetic field of a conventional superconducting joint is generally low, and in most cases, the joint part is placed in a low magnetic field region at a certain distance from the ferromagnetic coil or an additional electromagnetic shielding treatment is required. Therefore, developing a novel superconducting joint with low resistance, high strength and high stability becomes a key technical problem to be solved in the field. The medium-high entropy alloy is a novel material formed by mixing a plurality of (usually 3-5 or more) principal elements in a nearly equal proportion, breaks through the mode that the traditional alloy is mainly composed of one or two metal elements and obtains different performances by adding a specific small amount of other elements, for example, the transmission alloy steel is stabilized by adding a small amount of carbon, trace manganese, silicon and the like, and the core of the transmission alloy steel is that a simple solid solution structure is formed by utilizing high mixing entropy instead of complex intermetallic compounds. The material has remarkable advantages in the aspects of mechanics, thermal stability, chemical stability and the like, such as high yield strength and ductility, high temperature and high strength, strong corrosion resistance and oxidation resistance, excellent thermal stability and the like. Disclosure of Invention The invention aims at overcoming the technical defects in the prior art and provides a medium-high entropy alloy superconducting joint of a superconducting cable. The invention also aims to provide a preparation method of the medium-high entropy alloy superconducting joint of the superconducting cable. Another object of the present invention is to provide the use of the medium-high entropy alloy superconducting joint of the superconducting cable. The technical scheme adopted for realizing the purpose of the invention is as follows: A medium-high entropy alloy superconducting joint of a superconducting cable, which is prepared from medium-entropy alloy of 3-4 elements or high entropy alloy of more than 5 elements, wherein the elements comprise Li, be, B, C, N, mg, al, zn, nb, co, fe, ni, cu, mn, ti, V, ta, cr, V, zr, hf, ta, mo, W, sc or Sn. In the above technical scheme, the medium entropy alloy is Hf aNbbZrcTid、TaaNbbHfcZrd or NbaScbHfcZrd,TiaNbbTacNd,FeaNibCocCrd, wherein 5 is less than or equal to a, b, c, d is less than or equal to 35, and a+b+c+d=100. In the above technical scheme, the high-entropy alloy is HfaNbbTicVdZre、(ScZrNb)1-x[RhPd]x、TaaNbbHfcZrdTie、HfaTabNbcModWe or Nb aRebHfcZrdTie, wherein 5 is less than or equal to a, b, c, d, e is less than or equal to 35, and a+b+c+d+e= 100,0.3 is less than or equal to x is less than or equal to 0.4. In the technical scheme, the medium-high entropy alloy superconducting joint is in a form of a slice or a block. In the above technical solution, the flakes or blocks are grown by arc melting or laser suspension zone melting furnace. The invention also provides a preparation method of the medium-high entropy alloy superconducting joint, which comprises the following steps: And uniformly mixing 3-4 elements or more than 5 elements in an arg