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Preparation method of ultralow-loss NbTi superconducting wire

A superconducting wire, ultra-low technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the problem of increasing the hardness of the wire, increasing the resistivity of the matrix, and breaking the thin stretched wire, etc. problems, achieve excellent processing performance, solve the effect of high loss and low loss

Active Publication Date: 2022-07-22
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] There is a special fast-pulse superconducting magnet that requires the NbTi wire to have ultra-low loss, which requires that the matrix material of the NbTi wire needs to be made of high-resistance copper alloy instead of copper to increase the matrix resistivity; conventional low-loss The wire is usually made of CuNi or CuMn alloy. The higher the Ni content and Mn content in the alloy, the greater the matrix resistance, but the corresponding hardness of the wire will increase greatly, which will cause frequent breakage of the thin drawn wire. Therefore, in order to introduce higher resistance The matrix material, and to ensure the stability of the ultra-fine core wire processing process, the conventional method is bound to be unfeasible

Method used

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Embodiment 1

[0050] The present embodiment provides a method for preparing an ultra-low loss NbTi superconducting wire, which is specifically implemented according to the following steps:

[0051] Step 1. Heat the mold with an outer diameter of Φ101mm to 150°C, keep the temperature for 1 hour, then place a NbTi rod with a diameter of Φ78mm in the center of the mold, and then pour the molten copper water into the mold, the casting temperature is 1150°C, and the casting speed is is 250mm / min, and the mold cooling water flow is 1m 3 / h, and finally obtain NbTi / Cu single core rod by demoulding;

[0052] Step 2. Use a roller die to draw a single mandrel with a diameter of Φ100mm to Φ70mm, and the processing rate per pass does not exceed 5%, then use a conventional peeling die and a drawing die to draw to Φ0.985mm, and the thickness of electroplated Ni is 5μm. Cut the Ni-plated single-core thin wire with a diameter of Φ1.0mm to a fixed length of 2000mm;

[0053] Step 3. Insert the single-core ...

Embodiment 2

[0058] The present embodiment provides another method for preparing an ultra-low loss NbTi superconducting wire, which is specifically implemented according to the following steps:

[0059] Step 1. Heat the mold with an outer diameter of Φ76mm to 100°C, keep the temperature for 1 hour, then place a NbTi rod with a diameter of Φ58mm in the center of the mold, and then pour the molten copper water into the mold, the casting temperature is 1150°C, and the casting speed is is 150mm / min, and the mold cooling water flow is 0.5m 3 / h, and finally obtain NbTi / Cu single core rod by demoulding;

[0060] Step 2. The diameter Φ75mm single-core rod is drawn to Φ1.990mm by conventional peeling die and drawing die, the thickness of Ni-plated Ni is 10μm, and finally the Ni-plated single-core thin wire with diameter Φ2.0mm is cut to a fixed length to a length of 2000mm;

[0061] Step 3. Insert the single-core thin wire neatly into the porous copper tube, the outer diameter of the copper tube ...

Embodiment 3

[0066] The present embodiment provides a method for preparing an ultra-low loss NbTi superconducting wire, which is specifically implemented according to the following steps:

[0067] Step 1. Heat the mold with an outer diameter of Φ101mm to 150°C, keep the temperature for 1 hour, then place a NbTi rod with a diameter of Φ78mm in the center of the mold, and then pour the molten copper water into the mold, the casting temperature is 1150°C, and the casting speed is is 250mm / min, and the mold cooling water flow is 1m 3 / h, and finally obtain NbTi / Cu single core rod by demoulding;

[0068] Step 2. Use a roller die to draw a single mandrel with a diameter of Φ100mm to Φ70mm, and the processing rate per pass does not exceed 5%, then use a conventional peeling die and a drawing die to draw to Φ0.985mm, and the thickness of electroplated Ni is 5μm. Cut the Ni-plated single-core thin wire with a diameter of Φ1.0mm to a fixed length of 2000mm;

[0069] Step 3. Insert the single-core ...

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Abstract

The invention belongs to the technical field of superconducting wire preparation processes, and relates to a preparation method of an ultralow-loss NbTi superconducting wire, an NbTi / Cu single-core rod is prepared by a casting method, the single-core rod is cold-drawn into a fine wire, then the surface of the fine wire is uniformly plated with Ni, finally annealing heat treatment is carried out to improve the resistivity of a wire matrix, and the resistivity of the matrix is regulated and controlled by adjusting the thickness of a Ni plating layer, so that the ultra-low-loss NbTi superconducting wire is obtained. And the superfine core wire rod has excellent processing performance and ultralow loss. A multi-core secondary composite rod is prepared through 3D printing of a porous copper pipe, and finally, the 100,000-core-level NbTi superconducting wire with high critical current density and ultralow loss is successfully prepared through combination of pipe penetrating three-time composite and multiple times of aging heat treatment, and a traditional hot extrusion process is omitted in preparation of a single-core thin wire and the secondary composite rod. And the problems of high loss of the superfine core wire, poor deformation of the core wire, low yield and the like are thoroughly solved.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire rod preparation technology, relates to a NbTi superconducting wire rod, and in particular relates to a preparation method of an ultra-low loss NbTi superconducting wire rod. Background technique [0002] As the overall planning, conceptual design, construction and upgrade of large-scale scientific installations at home and abroad have been launched successively, including the International Thermonuclear Experimental Reactor (ITER), the Large Hadron Collider (LHC), the International Thermonuclear Experimental Reactor (ITER), the Large Hadron Collider (LHC), the One of the key materials used in these large-scale scientific installations such as the Ion Accelerator Project (HIAF) and the Circular Electron Positron Collider (CEPC) is superconducting wire. It is known in the industry that superconducting wires not only have zero resistance characteristics at low temperature, but also can g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B12/02H01B12/00
CPCH01B12/02H01B12/00Y02E40/60
Inventor 郭强王瑞龙柳祥张凯林朱燕敏李建峰刘向宏杜予晅冯勇张平祥
Owner 西部超导材料科技股份有限公司
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