CN110873852A - Preparation method of sample for WIC (wire in wire) inlaid critical current measurement - Google Patents
Preparation method of sample for WIC (wire in wire) inlaid critical current measurement Download PDFInfo
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- CN110873852A CN110873852A CN201811002177.XA CN201811002177A CN110873852A CN 110873852 A CN110873852 A CN 110873852A CN 201811002177 A CN201811002177 A CN 201811002177A CN 110873852 A CN110873852 A CN 110873852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1238—Measuring superconductive properties
- G01R33/1246—Measuring critical current
Abstract
The invention provides a preparation method of a sample for measuring the critical current of a WIC inlaid wire, which comprises the steps of taking the WIC inlaid wire, cleaning a wire sample framework, fixing the wire sample framework to one end of the wire sample framework, clamping the sample on a sample winding machine, winding the wire sample along the direction of a roller, fixing the wire sample by using screws, carrying out tin soldering, taking an enameled wire, welding the enameled wire to a wound WIC coil for 3 circles, wrapping and fixing a potential wire by using a low-temperature adhesive tape, grinding to remove foreign matters on copper rings on two sides, testing the sample in a low-temperature environment, measuring an obtained curve, and carrying out corresponding calculation processing to obtain the critical current value. By utilizing the WIC wire sample framework, a prepared sample is tightly combined with a groove body, the shape is uniform, the wound sample has no adverse phenomena of side turning, twisting and the like, the artificial instability factors caused by different sample preparation personnel are eliminated, the operation of the whole sample preparation process is simple, the process is standardized, and the wide applicability is realized in the field of superconducting wire measurement.
Description
Technical Field
The invention belongs to the technical field of superconducting material performance measurement, and relates to a preparation method of a sample for WIC (wireless fidelity) inlaid wire critical current measurement.
Background
From NbTi and Nb3Sn represents a low-temperature superconducting wire which is currently the most widely used superconductor. The method has extremely wide application in the fields of nuclear Magnetic Resonance Imaging (MRI), nuclear magnetic resonance spectrometer (NMR), large particle accelerator, superconducting energy storage system (SMES), magnetic confinement nuclear fusion device (Tokamak) and the like.
Nowadays, with the development of mass production of domestic low-temperature superconducting wires, the types of wires are increased, and the facing client groups are also increasing. The yield of the WIC inlaid wire is increased day by day, the requirement of the finished product rate of sample preparation is increased gradually, and the original ITER framework can not meet the normal winding of the current WIC inlaid wire sample. Because the WIC inlaid wire is specially formed by inlaying the copper groove wire and the round core wire in the structure, the WIC inlaid wire has the characteristics of large size and large copper ratio, time and labor are consumed in the winding process, the prepared sample is poor in combination with the groove body, the shape is difficult to unify, the wound sample has the adverse phenomena of side turning, twisting and the like, artificial unstable factors caused by different sample preparation personnel are caused, and the whole sample preparation process is difficult to be in standard consistency.
Disclosure of Invention
The invention provides a method for preparing a sample for measuring critical current of a WIC (wire in wire) inlaid wire, aiming at the technical problems that in the prior art, time and labor are consumed in the winding process, the prepared sample is poor in binding property with a groove body and difficult in uniformity in shape, the wound sample has adverse phenomena of side turning, twisting and the like, and the wound sample has artificial unstable factors caused by different sample preparation personnel and is difficult to be in standard consistency.
The invention provides a preparation method of a sample for measuring the critical current of a WIC (wireless fidelity) damascene wire, which comprises the following steps:
step 1: and taking the WIC inlaid wire, cleaning the wire sample framework, cleaning the framework by using an ultrasonic cleaning machine, and then dehydrating and drying.
Step 2: and one end of the wire sample is wound and bent, the wire sample is fixed to one end of the wire sample framework, the sample is clamped on a winding machine, and the wire sample is along the direction of the roller.
And step 3: and winding the wire sample along the threads, and when the wire sample is wound to the copper ring on the other side, winding the tail end of the sample on the bolt and fixing the tail end of the sample by using a screw.
And 4, step 4: and (4) soldering and fixing the WIC inlaid wires wound on the copper rings at the two ends of the wire sample framework.
And 5: taking an enameled wire, peeling off the paint at two ends, welding the enameled wire to the wound WIC coil for 3 circles, cutting off one end of the enameled wire with the length of 5-15 cm after welding, winding the other end of the enameled wire along a thread, and twisting the enameled wire when the enameled wire is wound to the other welding point.
Step 6: and (5) wrapping and fixing the potential line by using a low-temperature adhesive tape.
And 7: and (3) polishing to remove foreign matters on the copper rings on the two sides, testing the sample in a low-temperature environment, measuring the obtained curve, and performing corresponding calculation processing to obtain a critical current value.
In the invention, 2.2m of WIC inlaid wire is taken in the step 1, when a wire sample framework is cleaned, an ultrasonic cleaning machine is used for cleaning the framework, the framework is taken out, then absolute ethyl alcohol is put into the framework for dehydration and drying, and a sample maker wears gloves during the whole process of sample cleaning; step 3, wearing clean gloves in the whole process of winding the wire sample; step 4, soldering and fixing the WIC inlaid wires wound on the copper rings at the two ends of the framework by using a special soldering iron, wearing a 3M mask in the welding process, soldering tin by using a low-melting-point soldering tin wire, and completely removing the bolts on the copper rings at the two ends after the sample is welded; and 6, wiping the soldering paste at the welding spot by using alcohol for cleaning, and wrapping and fixing the potential line by using a low-temperature adhesive tape.
In the invention, step 5, an enameled wire with the length of 70cm is taken, the varnishes at two ends are scalded by soldering tin, the enameled wire is welded on the wound WIC coil by 30-40 cm, after welding, one end with the length of 5-15 cm is cut off, the other end is wound along a thread, and the enameled wire is twisted in pairs after being wound at the other welding point.
In the invention, step 7, the foreign matters on the copper rings on the two sides are polished by scouring pads to remove, and the product is required to be bright and free from residual soldering tin.
In the present invention, the material of the wire sample skeleton was Ti6Al 4V.
In the invention, a spiral groove body is arranged outside the side wall of the wire sample framework.
In the invention, the wire sample framework is annealed at the temperature of 250 ℃/2 h.
According to the wire sample framework, the wire sample framework is of a circular ring shape, the outer portion of the side wall of the middle portion of the circular ring is provided with the trapezoidal groove body, the two ends of the circular ring are provided with the copper rings, the copper rings are provided with the through holes, the bolts are arranged in the through holes, the trapezoidal groove body is wound in the middle portion of the outer wall of the circular ring in a threaded mode, the depth of the trapezoidal groove body is half of the opening width of the trapezoidal groove body, and the opening width of the trapezoidal groove body.
In the invention, four welding points are respectively arranged at two ends of the wire sample framework, and the four welding points at each end are uniformly distributed.
In the invention, two through holes of each copper ring are symmetrically arranged, the through holes on the same side of the two copper rings are aligned, internal threads are arranged in the through holes, and external threads matched with the internal threads of the through holes are arranged at one end of a bolt.
The invention has the beneficial effects that:
according to the preparation method of the sample for measuring the critical current of the WIC inlaid wire, provided by the invention, the sample is clamped into the groove body, the sample prepared by utilizing the WIC wire sample framework is tightly combined with the groove body, the shape is uniform, the wound sample has no adverse phenomena of side turning, twisting and the like, the artificial unstable factors caused by different sample preparation personnel are eliminated, the operation of the whole sample preparation process is simple, the process is standardized, and the preparation method has wide applicability in the field of superconducting wire measurement.
Drawings
FIG. 1 is a schematic diagram of a skeleton structure of a wire sample;
FIG. 2 is a drawing of a finished WIC inlaid wire winding;
FIG. 3 is a finished WIC damascene wire sample;
FIG. 4 is a critical current measurement curve;
FIG. 5 is a graph of a copper ratio 7.5WIC sample;
FIG. 6 is a graph of a copper ratio 10.5WIC sample.
In the figures 1-3, 1-ring, 2-groove, 3-through hole, 4-bolt, 5-copper ring, 6-welding point and 7-internal thread.
Detailed Description
The following description of the embodiments of the present invention will be made in further detail with reference to the accompanying fig. 1 to 6 and examples, but the method of the present invention is not limited to the following examples.
The first embodiment is as follows: the invention relates to a preparation method of a sample for measuring the critical current of a WIC (wireless fidelity) inlaid wire
The invention provides a preparation method of a sample for measuring the critical current of a WIC (wireless fidelity) damascene wire, which comprises the following steps:
step 1: 2.2m WIC inlaid wire, clean wire rod sample skeleton, put into absolute ethyl alcohol dehydration and stoving after the skeleton sanitization is taken out to ultrasonic cleaner when cleaning wire rod sample skeleton, sample preparation person wears gloves during the clean whole process of sample.
Step 2: and one end of the wire sample is wound and bent, the wire sample is fixed to one end of the wire sample framework, and the sample is clamped to the direction of the wire sample on the winding machine along the roller.
And step 3: the wire sample is wound along the threads, clean gloves are worn in the whole process, and when the wire sample is wound to the copper ring on the other side, the tail end of the sample is wound on the bolt and fixed by a screw, as shown in the attached figure 2 of the specification.
And 4, step 4: the WIC inlaid wire wound on the copper rings at the two ends of the framework is soldered and fixed by using a special soldering iron, a 3M mask is worn in the welding process, a low-melting-point soldering tin wire is selected for soldering tin, and all bolts on the copper rings at the two ends are removed after the sample is welded.
And 5: taking an enameled wire, peeling off the paint at two ends, welding the enameled wire to the wound WIC coil for 3 circles, cutting off one end of the enameled wire with the length of 5-15 cm after welding, winding the other end of the enameled wire along a thread, and twisting the enameled wire when the enameled wire is wound to the other welding point.
Step 6: and wiping the soldering paste at the welding spot, and wrapping and fixing the potential line by using a low-temperature adhesive tape.
And 7: and (3) polishing by using scouring pad to remove foreign matters on copper rings on two sides, testing the sample in a low-temperature environment as shown in the attached figure 3 of the specification, measuring the obtained curve, and performing corresponding calculation processing to obtain a critical current value, wherein the testing curve is shown in the attached figure 4 of the specification.
Example two: wire sample framework used in preparation method of sample for measuring critical current of WIC (wire in wire) inlaid wire
As shown in figures 1-2 of the present specification.
In the present invention, the material of the wire sample skeleton was Ti6Al 4V.
In the invention, the wire sample framework is annealed at the temperature of 250 ℃/2 h.
According to the wire sample framework, the wire sample framework is of a circular ring 1 type, the trapezoidal groove body 2 is arranged outside the side wall of the middle part of the circular ring 1, the copper rings 5 are arranged at two ends of the circular ring 1, the through holes 3 are formed in the copper rings 5, the bolts 4 are arranged in the through holes 3, the trapezoidal groove body 2 is wound in the middle of the outer wall of the circular ring 1 in a threaded mode, the depth of the trapezoidal groove body 2 is half of the opening width of the trapezoidal groove body 2, and the opening width of the trapezoidal groove body 2 is 1.2-1..
In the invention, four welding points 6 are respectively arranged at two ends of the wire sample framework, and the four welding points 6 at each end are uniformly distributed.
In the invention, two through holes 3 of each copper ring 5 are symmetrically arranged, the two through holes 3 of the same circular ring 5 are aligned with the through holes 3 on the same side, internal threads 7 are arranged in the through holes 3, and external threads matched with the internal threads 7 of the through holes 3 are arranged at one end of a bolt 4.
Example three: preparation of sample for measuring critical current of WIC inlaid wire with copper ratio of 7.5
Step 1: 1 WIC inlaid wire with the wire diameter of 2.286 multiplied by 1.152mm and the copper ratio of 7.5 is taken out, a wire sample framework is cleaned, the wire sample framework is cleaned by an ultrasonic cleaning machine, and after the wire sample framework is taken out, absolute ethyl alcohol is put into the wire sample framework for dehydration and drying, and a sample maker is required to wear gloves in order to keep the sample clean in the whole process.
Step 2: and one end of the wire sample is fixed to one end of the wire sample framework in a winding way, and the sample is clamped to the direction of the wire sample on the winding machine along the roller.
And step 3: and winding the wire sample along the threads, and winding the tail end of the sample on a bolt by using screws when the wire sample is wound to the copper ring on the other side after a clean glove is worn in the whole process.
And 4, step 4: the WIC inlaid wires wound on the copper rings at the two ends of the wire sample framework are soldered and fixed by using a special soldering iron, a 3M mask is worn in the soldering process, the soldering tin is a low-melting-point soldering tin wire, and all the bolts on the copper rings at the two ends are removed after the sample is soldered.
And 5: taking an enameled wire with the length of 70cm, scalding the paint at two ends by using soldering tin, welding the enameled wire to the wound WIC coil for 3 circles, wherein the length of the enameled wire is 35cm, cutting off one end of the enameled wire after welding to enable the length of the enameled wire to be 15cm, winding the other end of the enameled wire along a thread, and twisting the enameled wire after the enameled wire is wound to the other welding point.
Step 6: and wiping the soldering paste at the welding spot by using alcohol for cleaning, and wrapping and fixing the potential line by using a low-temperature adhesive tape.
And 7: and (3) polishing and removing foreign matters on copper rings on two sides by using scouring pads, wherein bright solder residues are required, a sample is tested in a low-temperature environment, a measured curve is shown in an attached figure 5 of the specification, and corresponding calculation processing is carried out to obtain the critical current of 1479.6mA in a 4T magnetic field.
Example four: preparation of sample for measuring critical current of WIC damascene wire with copper ratio of 10.5
Step 1: 1 WIC inlaid wire with the wire diameter of 2.286 multiplied by 1.152mm and the copper ratio of 10.5 is taken out, a wire sample framework is cleaned, the wire sample framework is cleaned by an ultrasonic cleaning machine, and after the wire sample framework is taken out, absolute ethyl alcohol is put into the wire sample framework for dehydration and drying, and a sample maker is required to wear gloves in order to keep the sample clean in the whole process.
Step 2: and one end of the wire sample is fixed to one end of the wire sample framework in a winding way, and the sample is clamped to the direction of the wire sample on the winding machine along the roller.
And step 3: and winding the wire sample along the threads, and winding the tail end of the sample on a bolt by using screws when the wire sample is wound to the copper ring on the other side after a clean glove is worn in the whole process.
And 4, step 4: the WIC inlaid wires wound on the copper rings at the two ends of the wire sample framework are soldered and fixed by using a special soldering iron, a 3M mask is worn in the soldering process, the soldering tin is a low-melting-point soldering tin wire, and all the bolts on the copper rings at the two ends are removed after the sample is soldered.
And 5: taking an enameled wire with the length of 70cm, scalding the paint at two ends by using soldering tin, welding the enameled wire to the wound WIC coil for 3 circles, wherein the length of the enameled wire is 35cm, cutting off one end of the enameled wire after welding to enable the length of the enameled wire to be 15cm, winding the other end of the enameled wire along a thread, and twisting the enameled wire after the enameled wire is wound to the other welding point.
Step 6: and wiping the soldering paste at the welding spot by using alcohol for cleaning, and wrapping and fixing the potential line by using a low-temperature adhesive tape.
And 7: and (3) polishing and removing foreign matters on copper rings on two sides by using scouring pads, wherein bright solder residues are required, a sample is tested in a low-temperature environment, the measured curve is shown in the attached figure 6 of the specification, and the result of the critical current under the 4T magnetic field is 1109.3mA through corresponding calculation processing.
Example five: the invention discloses a preparation method of a sample for measuring the critical current of a WIC (wireless fidelity) inlaid wire, which is used for verifying the reliability and stability of the sample
In order to prove the reliability and stability of the method, 4 sections of WIC inlaid wires are continuously taken from the same part of a long wire, and the curve measured by different operators of the wire sample skeleton according to the one-step operation of the embodiment is good, as shown in the attached figure 4 of the specification, and the test results are as follows:
| sample number | Magnetic field | IC |
| WIC-1 | 4T | 1472.2 |
| WIC-2 | 4T | 1469.8 |
| WIC-3 | 4T | 1473.6 |
| WIC-4 | 4T | 1468.4 |
The uncertainty of the relative standard of the test result of the calculated sample is 0.08 percent and less than 3 percent, the repeatability is good, and the requirement is met.
As described above, the present invention can be preferably implemented, and the above-mentioned embodiments only describe the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope determined by the present invention.
Claims (10)
1. A preparation method of a sample for measuring the critical current of a WIC damascene wire is characterized by comprising the following steps:
step 1: taking a WIC inlaid wire, cleaning a wire sample framework, cleaning the framework by using an ultrasonic cleaning machine, and then dehydrating and drying;
step 2: one end of a wire sample is wound and bent, the wire sample is fixed to one end of a wire sample framework, and the sample is clamped to the direction of the wire sample on a sample winding machine along a roller;
and step 3: winding a wire sample along the threads, and when the wire sample is wound to the copper ring on the other side, winding the tail end of the sample on a bolt and fixing the sample by using a screw;
and 4, step 4: soldering and fixing the WIC inlaid wires wound on the copper rings at two ends of the wire sample framework;
and 5: taking an enameled wire, peeling off the paint at two ends, welding the enameled wire to the wound WIC coil for 3 circles, cutting off one end of the enameled wire with the length of 5-15 cm after welding is finished, winding the other end of the enameled wire along a thread, and twisting the enameled wire to another welding point after the enameled wire is wound to another welding point;
step 6: wrapping and fixing the potential line by using a low-temperature adhesive tape;
and 7: and (3) polishing to remove foreign matters on the copper rings on the two sides, testing the sample in a low-temperature environment, measuring the obtained curve, and performing corresponding calculation processing to obtain a critical current value.
2. The method for preparing a sample for measuring the critical current of the WIC inlaid wire according to claim 1, wherein the WIC inlaid wire of 2.2m is taken in the step 1, the wire sample skeleton is cleaned by an ultrasonic cleaning machine, the skeleton is taken out and put into absolute ethyl alcohol for dehydration and drying, and a sample maker wears gloves during the whole process of sample cleaning; step 3, wearing clean gloves in the whole process of winding the wire sample; step 4, soldering and fixing the WIC inlaid wires wound on the copper rings at the two ends of the framework by using a special soldering iron, wearing a 3M mask in the welding process, soldering tin by using a low-melting-point soldering tin wire, and completely removing the bolts on the copper rings at the two ends after the sample is welded; and 6, wiping the soldering paste at the welding spot by using alcohol for cleaning, and wrapping and fixing the potential line by using a low-temperature adhesive tape.
3. The method for preparing a sample for measuring the critical current of the WIC inlaid wire according to claim 1, wherein in the step 5, an enameled wire with a length of 70cm is taken, the varnishes at two ends are scalded by soldering tin, the enameled wire is welded on the wound WIC coil for 30cm-40cm, one end with a length of 5cm-15cm is cut off after welding is completed, the other end is wound along a thread, and the enameled wire is twisted in a twisted manner after being wound at the other welding point.
4. The method for preparing a sample for measuring the critical current of the WIC mosaic wire as claimed in claim 1, wherein step 7 is to polish the foreign matters on the copper rings on both sides with a scouring pad to remove the foreign matters, and the bright wisdom of solder residue is required.
5. The method for preparing a sample for measuring the critical current of the WIC mosaic wire as claimed in claims 1-4, wherein the material of the wire sample skeleton is Ti6Al 4V.
6. The method for preparing a sample for measuring the critical current of the WIC damascene wire as defined in claim 5, wherein a spiral groove is formed outside the side wall of the wire sample frame.
7. The method of preparing a sample for measuring the critical current of a WIC mosaic wire as claimed in claim 5, wherein said wire sample skeleton is annealed at 250 ℃/2 h.
8. The method for preparing a sample for measuring the critical current of the WIC mosaic line as claimed in claim 5, wherein the wire sample frame is circular ring type, the outside of the side wall of the middle part of the circular ring is provided with a trapezoidal groove body, the two ends of the circular ring are provided with copper rings, the copper rings are provided with through holes, bolts are arranged in the through holes, the trapezoidal groove body is wound in the middle part of the outer wall of the circular ring in a threaded manner, the depth of the trapezoidal groove body is half of the opening width of the trapezoidal groove body, and the opening width of the trapezoidal groove body is 1.2-1.3 times of the.
9. The method of claim 5, wherein four welding points are respectively disposed at two ends of the wire sample frame, and the four welding points at each end are uniformly arranged.
10. The method according to claim 8, wherein two through holes are formed in each copper ring, the two through holes are symmetrically formed in the same ring, the through holes on the same side of the two copper rings are aligned, internal threads are formed in the through holes, and external threads adapted to the internal threads of the through holes are formed at one end of the bolt.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116338539A (en) * | 2023-05-12 | 2023-06-27 | 西安聚能超导线材科技有限公司 | Superconducting wire critical current testing framework, preparation method and critical current testing method |
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