Method of preparing High W content Ni-W alloy for high temp superconduct

A high-temperature superconducting and high-temperature technology, which is applied in the field of high-temperature superconducting coating tough baseband and superconducting thin film preparation, can solve the problems of low mechanical strength, affecting the application of YBCO coating conductors or AC applications, and unfavorable superconducting long strip materials. , to achieve the effect of high mechanical strength

Inactive Publication Date: 2008-02-27
BEIJING UNIV OF TECH
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Problems solved by technology

At present, the low-W content nickel-tungsten alloy baseband with a W content of 3-5at.% is used at home and abroad. Although such a baseband material has a good cubic texture, it still has strong magnetism in the liquid nitrogen temperature zone. It affects the application of the YBCO coated conductor prepared on it in high magnetic field or AC application, and the mechanical strength is low, which is not conducive to the preparation of superconducting long strip materials

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  • Method of preparing High W content Ni-W alloy for high temp superconduct
  • Method of preparing High W content Ni-W alloy for high temp superconduct

Examples

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Effect test

example 1

[0019] Example 1. Adopting Ni powder and W powder as raw materials, the purity is 99.9% by weight, the Ni powder particle size is 4~6 microns, the W powder particle size is 3~4 microns, and W accounts for 7.01% by atomic percentage in the alloy. After mixing evenly, put it into a mold for SPS sintering. The sintering temperature is 800° C., and the sintering holding time is 10 minutes. The sintering pressure is 80MPa. A Ni-7.01%W block with a density of 97.2% was obtained.

[0020] Carry out cold rolling and recrystallization annealing on the Ni-7.01% W block, the deformation of the cold rolling pass is 7-8%, and the total deformation is 97%. During the cold rolling process, the deformation reaches 80%, and an intermediate annealing is carried out , the annealing temperature is 800°C, and the annealing time is 0.5 hours. Then use H 2 The volume percentage is 4% Ar+H 2 Recrystallization annealing was carried out in a mixed atmosphere, the annealing temperature was 1000° C....

example 2

[0021] Example 2. Adopting the Ni-7.01% W block prepared in Example 1, carrying out cold rolling and recrystallization annealing, the pass deformation of cold rolling is 5~6%, and the total deformation is 95%. , every time the amount of deformation reaches 60%, an intermediate annealing is performed, and a total of 2 intermediate annealings are performed, the annealing temperature is 300°C, and the annealing time is 6 hours. Then use H 2 The volume percentage is 4% Ar+H 2 Recrystallization annealing is carried out in a mixed atmosphere, the annealing temperature is 1100° C., and the annealing time is 2 hours. A thin ribbon with a strong, single-oriented {100} texture was obtained, and Figure 2 shows its (111) and (200) pole figures. A very good cubic texture Ni-7.01%W baseband material is obtained, which can be used for the preparation of subsequent YBCO-coated superconducting materials.

example 3

[0022] Example 3. adopt Ni powder and W powder as raw materials, the purity is 99.9% by weight, the particle size of Ni powder is 4~6 microns, the particle size of W powder is 3~4 microns, and W accounts for 8.5% by atom percentage in the alloy. After mixing evenly, put it into a mold for SPS sintering. The sintering temperature is 1300°C, and no sintering heat preservation is carried out. The sintering pressure is 30MPa. A Ni-9.5%W block with a density of 97.5% was obtained.

[0023] Cold rolling and recrystallization annealing are carried out on the Ni-8.5% W block at room temperature. The deformation of the cold rolling pass is 3-4%, and the total deformation is 98%. During the cold rolling process, the deformation reaches 50%. One intermediate annealing was carried out, a total of four intermediate annealings were carried out, the annealing temperature was 500°C, and the annealing time was 3 hours. Then use H 2 The volume percentage is 7% Ar+H 2 Recrystallization anne...

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Abstract

This invention discloses a method for manufacturing high W-content Ni-W alloy substrates used on high-temperature superconductors. Low W-content (3-5 at. %) Ni-W alloy substrates have good cubic structure, but also have strong magnetism in liquid nitrogen temperature range and no mechanical strength. The method in this invention comprises the steps of: (1) mixing Ni powders and W powders with particle sizes of 3-6 mum, performing spark plasma sintering at 800-1300 deg.C, and keeping the temperature for 0-10 min, (2) cold-rolling the Ni-W sheets at room temperature with small pass strains of 3-8%, and performing intermediate annealing at 300-800 deg.C for 0.5-6 h when the strain is 30-80% until the total strain is more than 95%, and (3) annealing in a mixture of Ar and H2 at 1000-1400 deg.C for 0.5-3 h to obtain uniform Ni-W alloy substrates with W content in the range of 7.01-9.5 mol.%. The high W-content alloy substrates have such advantages as simple sintering process, low magnetism in liquid nitrogen temperature range and high mechanical strength.

Description

technical field [0001] The invention relates to a method for preparing a Ni-W baseband with polycrystalline texture and high W content, and belongs to the technical field of high-temperature superconducting coating tough baseband and superconducting thin film preparation. Background technique [0002] Compared with Bi-based superconducting strips, YBCO’s YBa for short 2 Cu 3 o 7.01-δ Superconductors have the ability to carry larger currents in a magnetic field, and their application prospects are very broad. Making brittle high-temperature superconducting materials into wires and strips is an important link to realize their practical applications. In recent years, great progress has been made in the preparation of wires and strips by depositing superconducting films on polycrystalline ductile metal substrates, and high-performance YBCO coated conductors have been successfully prepared. However, the texture state of the baseband directly affects the texture state of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22F1/10
Inventor 刘丹敏郝斐周美玲张久兴胡延槽
Owner BEIJING UNIV OF TECH
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