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Preparation of coating superconductivity high W content Ni-W alloy baseband

An alloy-based, superconducting technology, applied in the direction of metal rolling, can solve the problems of difficult large-scale production, the inability to form a highly sharp cubic texture, and the inability to prepare Ni-W basebands, etc., to achieve good cubic texture and high The effect of mechanical strength

Inactive Publication Date: 2008-08-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing problem is that it is difficult to achieve large-scale industrial production, and the intermediate annealing leads to the formation of oxides on the surface of the baseband, so that a highly sharp cubic texture cannot be formed after the final recrystallization annealing. When the W content is higher, it is more difficult to prepare high Quality Ni-W Alloy Baseband
Moreover, the patent does not give the result of further obtaining a high-quality transition layer on the Ni-W alloy base strip
[0004] In summary, the existing methods for preparing high W content cannot produce Ni-W base tapes with sharp cubic textures that can be used in coated superconducting wire tapes, and it is not easy to achieve large-scale production

Method used

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  • Preparation of coating superconductivity high W content Ni-W alloy baseband
  • Preparation of coating superconductivity high W content Ni-W alloy baseband
  • Preparation of coating superconductivity high W content Ni-W alloy baseband

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Use Ni powder and W powder with a purity of 99.9% as raw materials, prepare the powder according to the atomic percentage of Ni and W at 93:7, use high-energy ball milling to mix evenly, the filling rate is CR=2, and the ball milling time is T m = 4h;

[0028] 2) Put the mixed powder into a mold for cold isostatic pressing at a pressure of 200MPa, keep for 8min, homogenize annealing at 900°C, and keep warm for 10h to obtain a Ni-W alloy billet;

[0029] 3) Warm rolling the alloy billet at a temperature of 250° C., using a pass deformation of 2 to 5%; when the total deformation is greater than 75%, stop warm rolling;

[0030] 4) carry out pickling, remove surface oxide;

[0031] 5) Then start finish rolling at room temperature, adopt 2-5% pass deformation, use high-gloss rolls with surface roughness less than 10nm, the total deformation is greater than 98%, and the final thickness is 68 μm;

[0032] 6) For the strip obtained by rolling in Ar-4%H 2 Two-step recrysta...

Embodiment 2

[0035] 1) Ni powder and W powder are used as raw materials, the purity is 99.9%, the powder is prepared according to the atomic percentage of Ni and W at 93:7, and the powder is mixed evenly by high-energy ball milling, CR=10, T m = 1h;

[0036] 2) Put the mixed powder into a mold for cold isostatic pressing at a pressure of 250 MPa, keep it for 5 minutes, homogenize annealing at 1100°C, and keep it for 10 hours to obtain a Ni-W alloy billet;

[0037] 3) Warm rolling the alloy billet at a temperature of 250° C., using a pass deformation of 2 to 5%; when the total deformation is greater than 75%, stop warm rolling;

[0038]4) carry out pickling, remove surface oxide;

[0039] 5) Then start finish rolling at room temperature, adopt 2-5% pass deformation, use high-gloss rolls with surface roughness less than 10nm, and the total deformation is greater than 98%;

[0040] 6) For the strip obtained by rolling in Ar-4%H 2 Recrystallization annealing is carried out under a protectiv...

Embodiment 3

[0042] 1) Using Ni powder and W powder as raw materials, the purity is 99.9%, the powder is prepared according to the atomic percentage of Ni and W at 93:7, and the powder is mixed evenly by high-energy ball milling, CR=2, T m = 4h;

[0043] 2) Put the mixed powder into a mold for cold isostatic pressing at a pressure of 250 MPa and keep for 3 minutes; homogenize annealing at 1100°C and hold for 10 hours to obtain a Ni-W alloy billet;

[0044] 3) Carrying out warm rolling to the ingot at a temperature of 300°C, adopting a pass deformation of 2 to 5%; when the total deformation is greater than 75%, stop warm rolling;

[0045] 4) carry out pickling, remove surface oxide;

[0046] 5) Then start finish rolling at room temperature, adopt 2-5% pass deformation, use high-gloss rolls with surface roughness less than 10nm, and the total deformation is greater than 98%;

[0047] 6) For the strip obtained by rolling in Ar-4%H 2 Perform recrystallization annealing under protective atmo...

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Abstract

The invention relates to a method for preparing a high W-content Ni-W alloy base band with superconductive coating, pertaining to the technology field of the superconductive enhanced toughness base band with high temperature coating. The method aims to solve the problem that the mechanical strength and magnetism of the prior Ni-W base band can not satisfy further wide application of YBCO coating conductor. The method comprises the following steps: (1) The Ni and W power are mixed by a high-energy ball milling; (2) a high W-content (7 to 9.5 percent) Ni-W alloy billet is prepared using cold isostatic pressing method in power metallurgy; (3)the billet is warmly rolled using a high finish roller, and 2 to 5 percent of pass deformation is used;(4) the surface oxide is removed by acid cleaning; (5) the rolled base band is recrystallized and annealed to obtain the Ni-W alloy base band. The base band prepared by the method has the advantages of high cube texture, high mechanical strength, low magnetism or no magnetism, high finish of surface, easy industrial production, etc. Moreover, the method can meet the coating conductor base band of the epitaxially growing transition layer and superconductor layer.

Description

technical field [0001] The invention belongs to the technical field of high-temperature coating superconducting strengthened toughness baseband, and in particular relates to a preparation method of Ni-W alloy baseband with high W content (7-9.5at.%). Background technique [0002] Thanks to YBa 2 Cu 3 o 7-x (YBCO) superconducting material is a brittle ceramic, and there is a "weak connection" phenomenon when transmitting current, so coating it on a textured ductile metal substrate is an effective way to achieve large-scale application and production. train of thought. [0003] At present, the material used for the metal substrate is mainly Ni-5at.%W (Ni5W) alloy, and the Ni5W substrate with a hundred-meter-level high cubic texture has been successfully prepared and widely used as a substrate material in the research of coated conductors. However, the mechanical strength and magnetic properties of the Ni5W baseband still cannot meet the requirements for further widespread ...

Claims

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Application Information

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IPC IPC(8): B23P17/00C22C19/03C22C1/04B22F3/00B21B1/22C22F1/10C23G1/02
Inventor 索红莉祝永华赵跃马麟刘敏高忙忙程艳玲何东周美龄
Owner BEIJING UNIV OF TECH
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