High-yield-strength NbTi superconducting wire and preparation method thereof

CN122050951APending Publication Date: 2026-05-15XIAN SUPERCONDUCTING WIRE TECHNOLOGIES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN SUPERCONDUCTING WIRE TECHNOLOGIES CO LTD
Filing Date
2026-04-17
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing NbTi superconducting wire fabrication technologies struggle to balance high copper-to-superconducting ratio with high yield strength, and have weak anti-interference capabilities, failing to meet the performance requirements of high-field superconducting MRI and liquid helium-free superconducting MRI. In traditional processes, the difference in strength and hardness between copper and NbTi leads to poor synergistic deformation effects, and excessively high copper layer flow rates or work hardening of the stainless steel sheath can cause wire breakage risks.

Method used

A multi-layer composite structure is formed by thermal spraying of CuNi alloy powder, combined with a stainless steel sheath to constrain the deformation of the copper layer. Through precision peeling and small deformation processing, a high-strength-high-plasticity composite structure is formed, ensuring coordinated deformation of copper and NbTi and avoiding work hardening.

Benefits of technology

It achieves a synergistic balance between high copper ratio and high yield strength, improves the wire's anti-interference ability and deformation uniformity, reduces the risk of wire breakage, and is suitable for the use of high-field superconducting MRI and liquid helium-free superconducting MRI. The product has good consistency and is suitable for mass production.

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Abstract

The invention belongs to the technical field of superconducting wires, and discloses a high-yield-strength NbTi superconducting wire and a preparation method thereof. According to the method, CuNi alloy powder is coated on the outer walls of a thick-wall oxygen-free copper sheath and a drilled oxygen-free copper ingot through thermal spraying, meanwhile, an NbTi / Cu single-core rod is manufactured through sleeving and machining of an NbTi ingot, a CuNi alloy layer is sprayed on the surface of the NbTi / Cu single-core rod, then the NbTi / Cu single-core rod is sequentially loaded into the drilled oxygen-free copper ingot, the thick-wall oxygen-free copper sheath and a stainless steel sheath, and the NbTi / Cu single-core rod is manufactured. And a finished product is prepared through the processes of extrusion, stretching processing, post-processing and the like. The prepared wire forms a high-strength and high-plasticity layer matched composite structure, the copper ratio is controlled to be 10-15, the yield strength is excellent, the problem that the high copper ratio and the high yield strength are difficult to consider at the same time is solved, the coordinated deformation capacity of copper and NbTi and the deformation uniformity of the core wire are improved, and the wire is suitable for scenes such as a superconducting magnetic resonance imager.
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