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Prepn process of high temperature superconductive Ni-W alloy

A high-temperature superconducting and alloying technology, applied in the field of polycrystalline textured Ni-W baseband preparation, to achieve uniform composition

Inactive Publication Date: 2006-03-01
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, no Ni-W alloy material has been prepared by spark plasma sintering

Method used

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  • Prepn process of high temperature superconductive Ni-W alloy
  • Prepn process of high temperature superconductive Ni-W alloy
  • Prepn process of high temperature superconductive Ni-W alloy

Examples

Experimental program
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Effect test

example 1

[0027] Example 1. adopt 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 3% atomic percent of composition 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-3%W block with a density of 98% was obtained. figure 1 It is its backscattered electron diffraction (EBSD) diagram, which shows that the grain size is relatively uniform. figure 2 It is the grain distribution data calculated from the EBSD result, and the data shows that the average grain size of the sample is about 10 microns, and the grains are fine. The results of energy spectrum test show that the distribution of W in the alloy is very uniform.

[0028] Cold rolling and recrystallization annealing are carried out on the Ni-3%W block at room temper...

example 2

[0029] Example 2. adopt Ni powder and W powder as raw materials, the purity is 99.99% by weight, the particle size of Ni powder is 3-5 microns, the particle size of W powder is 3-5 microns, and W accounts for 5% by atomic percent in the alloy. After mixing evenly, put it into a mold for SPS sintering. The sintering temperature is 1000° C., and the sintering holding time is 5 minutes. The sintering pressure is 50MPa. A Ni-5%W block with a density of 98.5% was obtained. Figure 4 It is the backscattered electron diffraction (EBSD) figure, which shows that the grain size is uniform. Figure 5 It is the grain distribution data calculated from the EBSD result, and the data shows that the average grain size of the sample is about 10 microns, and the grains are fine. The results of energy spectrum test show that the distribution of W in the alloy is very uniform.

[0030] Cold rolling and recrystallization annealing are carried out on the Ni-5% W block at room temperature, the de...

example 3

[0031]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 7% of atomic percentage in the alloy. After mixing evenly, put it into a mold for SPS sintering. The sintering temperature was 1200°C, and no sintering heat preservation was carried out. The sintering pressure is 30MPa. A Ni-7%W block with a density of 97.7% was obtained. Figure 8 It is the backscattered electron diffraction (EBSD) figure, which shows that the grain size is uniform. Figure 9 It is the grain distribution data calculated from the EBSD result, and the data shows that the average grain size of the sample is about 6.6 microns, and the grains are fine. The results of energy spectrum test show that the distribution of W in the alloy is very uniform.

[0032] Cold rolling and recrystallization annealing are carried out on the Ni-7%W block at room temperature,...

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Abstract

The present invention belongs to the field of technology of preparing rough base belt for high temperature superconductive coating and superconductive film. The preparation process of the ppi includes the following steps: discharge plasma sintering the mixture inside mold comprising Ni powder and W powder of purity over 99.9 % and granularity of 3-6 micron; maintaining at 800-1200 deg.c and 30-80 MPa for 0-10 min; cold rolling Ni-W plate at room temperature in the gate deformation of 5-15 % and total deformation over 97 %; re-crystallizing and annealing in the atmosphere of Ar with mixed H2 in 4 vol%, at temperature of 900-1300 deg.c and with annealing time of 0.5-3 hr. The said process is simple and fast, and the obtained polycrystalline Ni-W belt is used in depositing high temperature superconductive YBCO film.

Description

technical field [0001] The invention relates to a method for preparing a polycrystalline textured Ni-W baseband, which 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, YBa 2 Cu 3 o 7-δ (YBCO) superconductor has the ability to carry a larger current in a magnetic field, and has a very broad application prospect. 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 superconducting film epitaxially grown on...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22F1/10C22C19/03
Inventor 刘丹敏张久兴郝斐胡延槽高菲周美玲
Owner BEIJING UNIV OF TECH
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