Preparation method of NbTi/CuNi superconducting switch wire with high Ni content

A technology of superconducting switching and content, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problems of surface tearing, work hardening, etc., so as to reduce the work hardening problem and realize mass production The effect of chemical production

Active Publication Date: 2021-11-02
西部超导材料科技股份有限公司
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned shortcoming of prior art, propose a kind of preparation method of the NbTi / CuNi superconducting switch wire of high Ni content, solve the surface tearing problem in peeling process and work hardening in cold drawing process The problem is that there is no broken wire during the whole stretching process, and the 10,000-meter long wire has been successfully obtained, and the mass production of NbTi / CuNi switch wire with high Ni content has been realized.

Method used

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  • Preparation method of NbTi/CuNi superconducting switch wire with high Ni content
  • Preparation method of NbTi/CuNi superconducting switch wire with high Ni content
  • Preparation method of NbTi/CuNi superconducting switch wire with high Ni content

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preparation example Construction

[0034] A method for preparing a NbTi / CuNi superconducting switch wire with high Ni content, characterized in that the specific operation process includes the following steps:

[0035] S1, using the CuNi alloy smelted by the intermediate frequency furnace as the billet, and then preparing the billet into CuNi tube billet and ingot, and adding the CuNi tube billet and ingot machine into NbTi / CuNi primary sheathing and secondary sheathing; CuNi alloy The grains are equiaxed, and the content of Ni in the alloy is 30-50wt.%.

[0036] S2. Assemble the NbTi / CuNi primary sheath and NbTi rod in step S1 to prepare a NbTi / CuNi primary composite billet, and then prepare a NbTi / CuNi primary billet through vacuum electron beam welding and hot extrusion; wherein, The preheating temperature for hot extrusion is 600°C-900°C, the holding time is 2h-6h, and the extrusion ratio is 3-15.

[0037] S3. Use a high-hardness tungsten carbide peeling die to peel off the NbTi / CuNi primary billet to remo...

Embodiment 1

[0043] Such as figure 1 As shown, the present invention provides a kind of preparation method of the NbTi / CuNi superconducting switch wire of high Ni content, and concrete operation process comprises the following steps:

[0044] S1. Using a CuNi alloy smelted in an intermediate frequency furnace with a Ni content of 35wt.% and equiaxed crystal grains as the billet, the billet is then prepared into a CuNi tube billet and an ingot, and the CuNi tube billet and the ingot billet are added as an external A NbTi / CuNi primary sheath with a diameter of 63mm and a secondary sheath with an outer diameter of 97mm.

[0045] S2. Use the assembly method to assemble the NbTi / CuNi primary sheath and the NbTi rod in step S1 once to prepare a NbTi / CuNi primary composite ingot, and then prepare a NbTi / CuNi primary rod through vacuum electron beam welding and hot extrusion billet; wherein, the hot extrusion preheating temperature is 700°C, the holding time is 2h, and the extrusion ratio is 15. ...

Embodiment 2

[0052] Such as figure 2 As shown, the present invention provides a kind of preparation method of the NbTi / CuNi superconducting switch wire of high Ni content, and concrete operation process comprises the following steps:

[0053] S1. Using a CuNi alloy smelted in an intermediate frequency furnace, with a Ni content of 40wt.%, and equiaxed crystal grains, as a billet, and then preparing the billet into a CuNi tube billet and an ingot, and adding the CuNi tube billet and ingot billet into a NbTi / CuNi primary sheath with outer diameter of 63mm and secondary sheath with outer diameter of 97mm;

[0054] S2. Use the assembly method to assemble the NbTi / CuNi primary sheath and NbTi rod in step S1 to prepare a NbTi / CuNi primary composite ingot, and then prepare a NbTi / CuNi primary billet through vacuum electron beam welding and hot extrusion ; Among them, the hot extrusion preheating temperature is 750°C, the holding time is 4h, and the extrusion ratio is 10.

[0055] S3. Use a hig...

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Abstract

The invention relates to a preparation method of a NbTi / CuNi superconducting switch wire with high Ni content. The preparation method specifically comprises the following steps: S1, machining a CuNi tube blank and an ingot blank into a NbTi / CuNi primary sheath and a NbTi / CuNi secondary sheath; S2, subjecting the NbTi / CuNi primary sheath and a NbTi rod to primary assembling to a prepare a NbTi / CuNi primary composite ingot blank; S3, subjecting a NbTi / CuNi primary bar billet to scaling through a high-hardness tungsten carbide scaling mold; S4, carrying out secondary assembling on the NbTi / CuNi secondary sheath and a NbTi / CuNi primary composite rod obtained in the step S3, and filling a gap with a CuNi rod; S5, subjecting a NbTi / CuNi secondary bar billet to scaling through the high-hardness tungsten carbide scaling mold; and S6, subjecting the NbTi / CuNi secondary composite rod to cold drawing so as to finally obtain the NbTi / CuNi superconducting switch wire. According to the method, the problem of strain hardening of the wire in a cold drawing process is weakened, and the wire is not broken in the whole drawing process.

Description

technical field [0001] The invention belongs to the technical field of superconducting composite wire processing, and in particular relates to a preparation method of NbTi / CuNi superconducting switch wire with high Ni content. Background technique [0002] The superconducting switch is a key component in the superconducting magnet, and its main functions are as follows: first, after the superconducting magnet is excited, the superconducting switch is closed, the power is cut off, and a lossless closed loop is formed between the superconducting switch and the magnet; , During the operation of the magnet, once the superconducting switch is quenched, the superconducting switch will be automatically disconnected to prevent the magnet from being damaged. However, the preparation technology of superconducting switch wire has been monopolized by foreign countries, making it the only part of the domestic magnet that has not been domestically produced. Therefore, it is necessary to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/04
CPCH01B12/04Y02E40/60
Inventor 周子敬郭强王瑞龙贾文兵刘向宏冯勇张平祥闫果
Owner 西部超导材料科技股份有限公司
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