CN85109182B - Diffusion welding method of superconductive strip (or wire rod) and its device - Google Patents
Diffusion welding method of superconductive strip (or wire rod) and its device Download PDFInfo
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- CN85109182B CN85109182B CN85109182A CN85109182A CN85109182B CN 85109182 B CN85109182 B CN 85109182B CN 85109182 A CN85109182 A CN 85109182A CN 85109182 A CN85109182 A CN 85109182A CN 85109182 B CN85109182 B CN 85109182B
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- welding
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Abstract
The present invention relates to a welding method of superconducting belts (wires) and a device thereof, which belongs to the field of a superconducting technique. The present invention is characterized in that a vacuum high-temperature pressurizing short-time diffusion method is used for welding; the positions to be welded of the superconducting belts (wires), such as niobium-triple-tin, etc. are mutually overlapped and placed in a pressurized welding electrode, and the positions to be welded are heated to be 950 DEG C or so; under the condition that the vacuum degree is more than 10+[-4] torrs, the positions diffuse for several minutes so that superconductive material of the overlapped position interdiffuses to be jointed together so as to achieve the purpose of superconducting connection. The device has the advantages of simplicity and convenient operation; the resistance of welding points is smaller than 5*10+[-4] omega; the complete critical current density is higher than 3*10+[4]A/CM+[2]. Besides, the device is used for manufacturing a plurality of Nb-[3]Sn superconducting magnets which have high stability, and the field strength of the Nb-[3]Sn superconducting magnets is 8T.
Description
The invention belongs to the superconductor welding technology field
Because superconducting magnet has physical characteristics such as upper critical magnetic field, high critical current densities, D.C. resistance equal zero, people have made that volume is little, field intensity is high, the various laboratories superconducting magnet of consumed power not.And modern technologies are had higher requirement to superconducting magnet.As the nuclear magnetic resonance chemical analyser magnet, not only require high field intensity and high evenness, the requirement of high stability has more been proposed.For example: the Nb-Ti nmr magnet of a field intensity 7T, should be for reaching high stability requirement magnet resistance less than 10
-12Ω.Magnet needs to make with tens thousand of rice noodles materials, and about long 1 km of general superconduction band (line) material, this just needs a kind of welding method that many bands (line) material is coupled together.In magnet technology, the superconduction of single core and multicore Nb-Ti line welding has several method at present.As described in document (1).But Nb
3The superconduction solder technology of Sn band (line) material is still unresolved.Adopt indium to make the common method for welding of scolder at present in the low temperature field, the resistance of its welding point is 10
-7-10
-8Ω can not meet the demands far away.And Nb
3The Sn magnet can produce higher field intensity, can reach 12T, thereby improves the level of nuclear magnetic resonance spectrometer greatly.Thereby Nb
3The solution of the superconduction welding method of Sn band (line) material is an important techniques problem.This is a main cause of the present invention.
Second reason of the present invention is that the superconducting magnet that the laboratory is used is worked in liquid helium, needs to lead to from magnet the current feed of room temperature power supply, thereby the Joule heat that the resistance partly of the normal conductor on the lead-in wire produces becomes the main source that consumes liquid helium.Adopt superconductor technology can form the full superconduction closed loop mode work of magnet itself.When removing the external power electric current gradually, electric current progresses into full superconduction closed-loop path, forms stable closed current circulation, because connection resistance is almost nil, thus can keep the magnetic field of high stability for a long time, particularly important for this point of magnet of long-term operation.Owing to eliminated the liquid helium loss that Joule heat brings, thereby improved the utilization rate of liquid helium greatly, reduced the magnet running expense.
The document that reflects this technology:
（1）Cryogenics 1974，Vol.14，NO.9.518-519
(2) clear 58-74291
(3) clear 58-128281
Document (1) has been introduced the welding method more than 50 strands Nb-Ti superconducting line.The pulsating welder that adopts I, a P, G, J to make has been reequiped soldering tip and has been increased an inert gas installation, removes the copper base, cleans filament, is placed on spot welding on the Nb-Ti paper tinsel method with etch.
What document (2), (3) were introduced is to make certain special steel joint with vacuum diffusion welding method.
The objective of the invention is to propose a kind of Nb of vacuum diffusion welding method welding random length
2Sn superconduction band (line) material, compared with the prior art it make Nb
2The welding point resistance of Sn superconduction band (line) material is without hindrance by there being resistance to become, thereby the magnetic field that can keep high stability for a long time, sets up the magnet of long-term operation, has also eliminated the liquid helium loss that Joule heat brings simultaneously.As Nb
3The superconduction welding of Sn superconduction band (line) material requires the connection resistance of welding less than 1 * 10 according to practicality
-12Ω, full critical current density is greater than 2 * 10 under zero magnetic field
4A/cm
2, be suitable for the coiling magnet.
Accompanying drawing is the weld jig structural representation, in conjunction with the accompanying drawings, welding method of the present invention and weld jig thereof is described.Weld jig is made up of alumina tube (1), flute profile alumina wafer (2) and butterfly heating plate (3), and it is a kind of weld jig of energy pressurized, heated.Welding position (4) is drawn by the direction of vertical drawing.The butterfly heating plate is to make with refractory metal, can be tungsten, molybdenum, tantalum etc., and heating plate contacts along the flute profile alumina wafer, welding position, plane is produced than even temperature, and heating-cooling is rapid, and the elastic construction form that it is special is beneficial to the loading, unloading of welding material especially.Flute profile alumina wafer (2) separates heating plate (3) with welding material, form indirect, can avoid like this that the welding position causes adhesion with the METAL HEATING PROCESS sheet in the welding process, otherwise damages solder joint, and heating plate (3) also can not be reused.Alumina tube (1) plays insulation and bears pressure.Weld jig that can pressurized, heated shown in the drawings has guaranteed the repetition, stable, reliable of welding condition.
Welding method of the present invention is to realize like this.(chemical attack can be FeCl with the chemical method corrosion with soldered superconduction band (line) material end surface copper layer
3Or HNO
3) expose about 1 centimetre original tape, take the lead to overlap mutually with two then, place a pair of flute profile alumina wafer (2) centre position, promptly welding material is pressurized on the welding position (4) by alumina tube (1) perpendicular to drawing, and pressure is 5-10Kg/cm
2When vacuum reaches 10
-4When torr was above, electric current was given birth to heat through heating plate (3), and heat is heated soldered position through alumina wafer (2) indirectly, is warmed to about 950 ℃.The purpose of indirect is to avoid welding material to contact with heating plate to cause unnecessary adhesion.The welding of finishing a non-resistance solder joint was generally 5-10 minute.To weld good material subsequently and take out vacuum chamber, carry out copper plating treatment, stable in order to the superconducting characteristic of solder joint.
The requirement of magnet manufacturing technology has been satisfied in the superconduction welding of adopting the present invention to carry out; The welding point of making detects connection resistance＜5 * 10 through the follow current method
-14Ω, and made the high stability Nb that a plurality of field intensity are 8 teslas
3The Sn superconducting magnet; Method of the present invention can continuous welding after the start, contact of weldering about half an hour, the solder joint success rate is absolutely, can weld the superconductor belt of random length easily, therefore be reliably, a kind of novel welding method that efficient is high.The superconducting magnet that the laboratory is used uses method of the present invention to form superconducting joint, forms the superconduction closed circulation, reduces liquid helium consumption, thereby reduces experiment fees, reduces expenses, and this is all having significance aspect science and technology development and the economic benefit two.
Embodiment one
The inventive method has been used for the long homemade Nb of 800-1000 rice
3The superconductivity of Sn band detects, earlier Nb
3FeCl is put at the position that the Sn band will weld
3Corrode in the solution, rapidly the band of handling well will be overlapped in weldering place, put into the vacuum chamber weld jig, the sealed vacuum chamber.When vacuum reaches 2-5 * 10
-5Torr, be heated to about 950 ℃.7-10Kg/cm pressurizes on by scolder
2Can obtain intact pad in heating after 5 minutes.After band (line) material takes out vacuum chamber, copper facing again.The method has been used for nearly hundred homemade Nb
3The superconductivity of Sn band detects.
Claims (3)
1, a kind of metal material does not attach the vacuum diffusion welding method of material, it is characterized in that a kind of high-temperature vacuum diffusion welding method can weld the Nb of random length
3Sn superconduction band (line) material.
2, vacuum diffusion welding method according to claim 1 is characterized in that the welding position should impose 5-10Kg/cm
2Pressure and vacuum 10
-4When torr is above, heat about 950 ℃, temperature retention time 5-10 minute, superconduction band (line) material that welding is good must be through copper plating treatment.
3, vacuum diffusion welding method according to claim 1 is characterized in that the anchor clamps that weld superconduction band (line) material are made up of alumina tube (1), flute profile alumina wafer (2) and butterfly heating plate (3).Heating plate (3) is made by refractory metal.Pressure is delivered on the welding position by alumina tube (1), heating plate (3) and alumina wafer (2); Temperature is delivered on the welding position by heating plate (3), alumina wafer (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85109182A CN85109182B (en) | 1985-12-20 | 1985-12-20 | Diffusion welding method of superconductive strip (or wire rod) and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85109182A CN85109182B (en) | 1985-12-20 | 1985-12-20 | Diffusion welding method of superconductive strip (or wire rod) and its device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85109182A CN85109182A (en) | 1987-06-24 |
| CN85109182B true CN85109182B (en) | 1988-03-02 |
Family
ID=4796265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85109182A Expired CN85109182B (en) | 1985-12-20 | 1985-12-20 | Diffusion welding method of superconductive strip (or wire rod) and its device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85109182B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568705A (en) * | 2012-01-05 | 2012-07-11 | 中国科学院合肥物质科学研究院 | Producing method of niobium three stannum cable-in-conduit conductors of large superconducting magnets |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101888026B (en) * | 2010-06-30 | 2012-07-18 | 中国科学院电工研究所 | Bronze process Nb3Sn superconductor multi-core wire connector |
| CN104671818B (en) * | 2014-12-19 | 2017-03-15 | 上海大学 | Diffusion welding (DW) silver layer connects YBCO high-temperature superconducting thin film band techniques |
| CN114619131B (en) * | 2021-09-24 | 2023-03-31 | 上海交通大学 | Solderless welding joint and welding manufacturing method thereof |
-
1985
- 1985-12-20 CN CN85109182A patent/CN85109182B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102568705A (en) * | 2012-01-05 | 2012-07-11 | 中国科学院合肥物质科学研究院 | Producing method of niobium three stannum cable-in-conduit conductors of large superconducting magnets |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85109182A (en) | 1987-06-24 |
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