CN111029032A - Method for improving surface quality of NbTi superconducting wire - Google Patents
Method for improving surface quality of NbTi superconducting wire Download PDFInfo
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- CN111029032A CN111029032A CN201911128020.6A CN201911128020A CN111029032A CN 111029032 A CN111029032 A CN 111029032A CN 201911128020 A CN201911128020 A CN 201911128020A CN 111029032 A CN111029032 A CN 111029032A
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
A method for improving surface quality of NbTi superconducting wire rods is characterized in that a secondary tinning process of NbTi superconducting wires for MRI is a process of melting plated soldering tin and then tinning again, so that the NbTi superconducting wires with poor surface quality or over-poor size can be sequentially subjected to high-concentration soldering flux, a drying device, high-temperature tin liquid and a die with proper size, secondary tinning is completed under the condition that the soldering flux on the surfaces of the wires is sufficient, the temperature of the soldering flux is 230-450 ℃, the drawing speed range is 10-80 m/min, the NbTi superconducting wires with high surface quality and meeting the requirements in size are obtained, unqualified products are recycled, and the cost of the NbTi superconducting wires is reduced.
Description
Technical Field
The invention belongs to the technical field of superconducting material processing, and relates to a method for improving the surface quality of an NbTi superconducting wire.
Background
Magnetic Resonance Imaging (MRI) is an important modern medical image diagnosis and treatment means, and the core and the foundation of the MRI are NbTi superconducting wires, wherein the embedded NbTi superconducting wires have the advantages of large copper ratio, low copper processing rate and the like, so that the embedded NbTi superconducting wires are low in processing cost, and the prepared magnet is stable and safe in operation, and therefore, the embedded NbTi superconducting wires become a leading material for preparing a superconducting magnet which is a key component of a magnetic resonance imaging system (MRI).
Since the MRI superconducting magnet must achieve high magnetic field uniformity to form high quality images, the superconducting wire must have high surface quality and high dimensional accuracy to ensure high stability of the magnet.
The traditional preparation method of the embedded NbTi superconducting wire rod is obtained by plating tin in high-temperature lead-free tin liquor and performing inlay welding through a shaping die, and meanwhile, the flux is used as a soldering tin surfactant to obtain a high-surface-quality inlaid wire, so that the process is very complex.
Because a large amount of tin ash and tin slag are continuously generated by high-temperature tin liquid and any link failure in the process, the surface quality of the embedded NbTi superconducting wire is poor and the dimensional accuracy is low.
The welding-assisting link breaks down and can directly lead to the wire rod surface quality to be poor, the mould core abrasion of the embedding mould can lead to the whole out-of-tolerance of the wire rod size, the wire rod of the type is thoroughly scrapped, and the economic loss caused is large.
Disclosure of Invention
The invention aims to provide a method for improving the surface quality of an NbTi superconducting wire rod, which solves the problem of accumulation of unqualified products caused by unstable surface quality and unqualified size of the traditional embedded NbTi superconducting wire rod.
The purpose of the invention is realized by the following technical scheme:
a method for improving the surface quality of an NbTi superconducting wire rod comprises the following specific steps:
s1, selecting a NbTi superconducting wire with poor surface quality which is subjected to mosaic welding, sampling, and completing RRR value and yield strength test and size measurement;
s2: sequentially passing the NbTi superconducting wire selected in the S1 through a solder resist, a drying device, a high-temperature tin liquid and a die with a proper size, and carrying out secondary tin plating, wherein the solder temperature is 230-450 ℃, and the drawing speed range is 10-80 m/min;
s3: and testing the RRR value and the yield strength of the wire rod after the secondary tinning and measuring the size, and judging whether the technical requirements can be still met.
Further: the soldering flux comprises 200-250 g/L of zinc chloride, 100-125 g/L of ammonium chloride, 200-250 ml/L of hydrochloric acid and 2% of isopropanol, and the secondary tinning process comprises the steps of firstly melting the plated soldering tin and then tinning again, wherein the soldering flux is required to participate in the secondary tinning process.
Further: and drying the soldering flux on the surface of the wire rod after the soldering flux is dried by a drying device.
Further: the size of the mould for the secondary tinning needs to be confirmed in advance.
The invention has the beneficial effects that: a method for improving surface quality of NbTi superconducting wire rods is characterized in that a secondary tinning process of NbTi superconducting wires for MRI is a process of melting plated soldering tin and then tinning again, so that the NbTi superconducting wires with poor surface quality or over-poor size can be sequentially subjected to high-concentration soldering flux, a drying device, high-temperature tin liquid and a die with proper size, secondary tinning is completed under the condition that the soldering flux on the surfaces of the wires is sufficient, the temperature of the soldering flux is 230-450 ℃, the drawing speed range is 10-80 m/min, the NbTi superconducting wires with high surface quality and meeting the requirements in size are obtained, unqualified products are recycled, and the cost of the NbTi superconducting wires is reduced.
Detailed Description
Example 1
A method for improving the surface quality of an NbTi superconducting wire rod comprises the following specific steps:
s1, selecting a NbTi superconducting wire with poor surface quality which is subjected to mosaic welding, sampling, and completing RRR value and yield strength test and size measurement;
s2: and (3) sequentially passing the NbTi superconducting wire selected in the S1 through a solder resist, a drying device, a high-temperature tin liquor and a die with a proper size, and carrying out secondary tin plating.
The drying device consists of 4 heating pipes, the length of each heating pipe is 50cm, and the inner diameter of each heating pipe is about 10 cm.
The solder temperature is 230-450 ℃, the drawing speed range is 10-80 m/min, and the NbTi superconducting wire with high surface quality is obtained.
S21: the concentration of the soldering flux is 200-250 g/L of zinc chloride, 100-125 g/L of ammonium chloride, 200-250 ml/L of hydrochloric acid and 2% of isopropanol, the secondary tinning process is to melt the plated soldering tin firstly and then tin is plated again, a large amount of soldering flux is needed to participate in the secondary tinning process, and the surface quality of the wire rod is ensured to be good.
S22: and the soldering flux on the surface of the wire rod after the soldering is dried by the drying device, so that the soldering flux is prevented from being separated from the surface of the wire rod along with the evaporation of water in advance during secondary tin plating.
S23: the size of the die for secondary tin plating needs to be confirmed in advance, so that the size of the wire is prevented from being out of tolerance.
The yield strength of the wire rod is reduced in the secondary tinning process, the wire rod can only be used for wire rods with sufficient yield strength allowance, and the method can not be used for multiple times for improving the surface quality of the same wire rod.
S3: and testing the RRR value and the yield strength of the wire rod after the secondary tinning and measuring the size, and judging whether the technical requirements can be still met.
Example 2
S1: selecting an NbTi superconducting wire with the specification of 2.40 multiplied by 1.60mm and serious surface tin nodule, sampling and testing: the RRR value is 210 (the technical requirement is more than 175), the 0.2% yield strength is 183MPa (the technical requirement is more than 140MPa, the allowance is sufficient), and the size of a tin nodule is 2.429 multiplied by 1.603mm (the technical requirement is (2.40 multiplied by 1.60) ± 0.015mm, and the narrow edge exceeds the upper difference).
S2: and (3) sequentially passing the NbTi superconducting wire selected in the step (1) through a high-concentration soldering flux, a drying device, a high-temperature tin liquid and a die with a proper size to perform secondary tin plating.
The solder temperature is 230-450 ℃, the drawing speed range is 10-80 m/min, the NbTi superconducting wire with high surface quality is obtained, and tin nodules are completely eliminated.
S3: tests show that the RRR value of the wire rod after the secondary tinning is 233 (the technical requirement is more than 175 and meets the requirement), the 0.2% yield strength is 161MPa (the technical requirement is more than 140MPa and meets the requirement), and the wire rod size is 2.398 multiplied by 1.601mm (the technical requirement size is (2.400 multiplied by 1.600) ± 0.015mm and meets the requirement).
Example 3
S1: selecting a NbTi superconducting wire with the specification of 1.70 multiplied by 1.20mm, good surface quality and super-poor size, sampling and testing: the RRR value is 182 (the technical requirement is more than 175), the 0.2% yield strength is 202MPa (the technical requirement is more than 140MPa, the allowance is sufficient), and the size is 1.722 multiplied by 1.205mm (the technical requirement is (1.70 multiplied by 1.20) ± 0.015mm, and the width edge exceeds the upper difference).
S2: and (3) sequentially passing the NbTi superconducting wire selected by the S1 through a soldering flux with higher concentration, a drying device, a high-temperature tin liquid and a die with a proper size, and carrying out secondary tin plating.
The solder temperature is 230-450 ℃, the drawing speed range is 10-80 m/min, and the NbTi superconducting wire with high surface quality is obtained.
S3: tests show that the RRR value of the wire rod after the secondary tinning is 217 (the technical requirement is more than 175 and meets the requirement), the 0.2% yield strength is 185MPa (the technical requirement is more than 140MPa and meets the requirement), and the wire rod size is 1.701 multiplied by 1.196mm (the technical requirement size is (1.70 multiplied by 1.20) +/-0.015 mm and meets the requirement).
Claims (4)
1. A method for improving the surface quality of an NbTi superconducting wire is characterized by comprising the following specific steps:
s1, selecting a NbTi superconducting wire with poor surface quality which is subjected to mosaic welding, sampling, and completing RRR value and yield strength test and size measurement;
s2: sequentially passing the NbTi superconducting wire selected in the S1 through a solder resist, a drying device, a high-temperature tin liquid and a die with a proper size, and carrying out secondary tin plating, wherein the solder temperature is 230-450 ℃, and the drawing speed range is 10-80 m/min;
s3: and testing the RRR value and the yield strength of the wire rod after the secondary tinning and measuring the size, and judging whether the technical requirements can be still met.
2. The method of claim 1, wherein the flux comprises 200-250 g/L of zinc chloride, 100-125 g/L of ammonium chloride, 200-250 ml/L of hydrochloric acid, and 2% of isopropanol, and the second tin plating process comprises melting the plated solder and then re-plating the tin, wherein the flux is required to participate in the second tin plating process.
3. The method of claim 1, wherein the flux on the surface of the wire after the flux is dried by a drying device.
4. The method of claim 1, wherein the die for secondary tin plating is sized in advance.
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| CN201911128020.6A CN111029032B (en) | 2019-11-18 | 2019-11-18 | Method for improving surface quality of NbTi superconducting wire |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116741459A (en) * | 2023-07-05 | 2023-09-12 | 广东中实金属有限公司 | Preparation method of ultra-large copper grooved wire for superconducting cable |
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| JP4214200B2 (en) * | 2003-08-06 | 2009-01-28 | 株式会社神戸製鋼所 | Powder method Nb3Sn superconducting wire |
| WO2008015941A1 (en) * | 2006-08-02 | 2008-02-07 | The Furukawa Electric Co., Ltd. | Composite superconducting wire rod, method for manufacturing composite superconducting wire rod, and superconducting cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116741459A (en) * | 2023-07-05 | 2023-09-12 | 广东中实金属有限公司 | Preparation method of ultra-large copper grooved wire for superconducting cable |
| CN116741459B (en) * | 2023-07-05 | 2024-01-02 | 广东中实金属有限公司 | Preparation method of copper grooved wire for superconducting cable |
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| CN111029032B (en) | 2021-07-06 |
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