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Method for improving content of cubic texture of Ni9.3W base band for YBCO superconductor

A technology of cubic texture and baseband, which is applied in the field of preparation of textured baseband for YBCO superconductors, to achieve the effects of short sintering process, reduced work hardening and less impurity elements

Inactive Publication Date: 2016-04-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the patent CN102500638A adopts the heat treatment method between rolling to alleviate the work hardening of high tungsten base strip, optimize the rolling texture to obtain high cubic texture, which has also been verified by many research results, but its cubic texture content also needs to be further improved improve

Method used

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  • Method for improving content of cubic texture of Ni9.3W base band for YBCO superconductor
  • Method for improving content of cubic texture of Ni9.3W base band for YBCO superconductor
  • Method for improving content of cubic texture of Ni9.3W base band for YBCO superconductor

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Embodiment 1

[0030] The combined method of powder metallurgy blank making + rolling intermediate heat treatment is adopted. Ni powder and W powder with an atomic percentage of 99.99% are configured into a mixed powder according to an atomic percentage of 90.7:9.3 as a raw material. After ball milling at 150rpm for 5 hours in an agate ball mill tank protected by an argon atmosphere, a uniformly mixed powder was obtained; the mixed powder obtained by ball milling was put into a graphite mold, pre-pressed with a press and left to stand for 1 hour, and then sintered by discharge plasma technology. The pre-compression pressure is 9MPa, the sintering process is always maintained at a constant pressure of 30MPa, the temperature is raised to 850°C at 100°C / min and kept for 5 minutes, and then cooled in the furnace; the obtained original billet is homogenized and annealed at 1200°C for 15 hours, and then hot-rolled at 1200°C Then get the initial billet. A billet with a thickness of 10mm was cut by...

Embodiment 2

[0032] The combined method of powder metallurgy blank making + rolling intermediate heat treatment is adopted. Ni powder and W powder with an atomic percentage of 99.99% are configured into a mixed powder according to an atomic percentage of 90.7:9.3 as a raw material. After ball milling at 120rpm for 6 hours in an agate ball mill tank protected by an argon atmosphere, a uniformly mixed powder was obtained; the mixed powder obtained by ball milling was put into a graphite mold, pre-pressed with a press and left for 1.5 hours, and then sintered by discharge plasma technology , the precompression pressure is 8MPa, the sintering process is always kept at a constant pressure of 35MPa, the temperature is raised to 855°C at 90°C / min for 4min and then cooled with the furnace; the obtained original billet is homogenized at 1150°C for 24h, and then heated The initial billet is obtained after rolling. A billet with a thickness of 10 mm was cut by wire cutting as an experimental billet,...

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Abstract

The invention relates to a method for improving the content of a cubic texture of a Ni9.3W base band for a YBCO superconductor, and belongs to the field of preparation of a texture metal base band for a coating superconductor. According to the method, the content of the cubic texture of the Ni9.3W base band is improved by combining a plurality of cubic texture improvement methods, and reference is provided for preparing high cubic texture Ni9.3W base band in future. Through the method that powder metallurgy blank forming and during-rolling heat treatment are combined, the content of the cubic texture of the Ni9.3W base band is improved. A spark plasma sintering technology is adopted in the billet preparing stage, and an initial billet which is high in compactness, few in impurity element and fine in grain is obtained. Then during-rolling heat treatment is adopted to remit work hardening in the rolling process, the basis of slippage deformation is provided for further follow-up rolling deformation, more grains trend to be a copper type rolling texture facilitating cubic texture formation, and finally the high cubic texture is obtained. The Ni9.3W base band prepared through the method has the higher cubic texture, and the requirement of the YBCO coating superconductor can be further met.

Description

technical field [0001] The invention relates to a method for increasing the cubic texture content of a Ni9.3W baseband for a YBCO superconductor, and belongs to the technical field of preparing a textured baseband for a YBCO superconductor. Background technique [0002] Rolling-assisted biaxial texturing (RABiTS) technology has become the mainstream technology for preparing coated conductors (YBCO) due to its low cost and broad application prospects. For the RABiTS baseband, strong cubic texture, high yield strength, and no ferromagnetism are required. Ni5W alloy baseband is favored by researchers because of its easy to obtain cubic texture. At present, the Ni5W alloy base strip has been widely used in the preparation of YBCO coated conductors, and industrial production has been realized. However, since the Ni5W alloy base strip is still ferromagnetic in the liquid nitrogen temperature range, it will cause hysteresis loss in AC applications. In addition, its yield strength...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/04C22F1/10C22F1/02
CPCC22C19/03C22C1/0433C22F1/02C22F1/10
Inventor 索红莉彭发学马麟田辉王毅刘敏刘婧喻丹孟易辰
Owner BEIJING UNIV OF TECH
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