Aluminum slot wire WIC superconducting wire and preparation method thereof

Abstract

The invention belongs to the technical field of superconducting wires, and relates to an aluminum slot wire WIC superconducting wire and a preparation method thereof. The invention provides a preparation method of an aluminum slot wire WIC superconducting wire, and the method comprises the steps: selecting a workpiece according to a preparation technology of the aluminum slot wire WIC superconducting wire, and the workpiece comprises an aluminum slot wire, a superconducting round wire and two rolls of soldering round wires; the superconducting round wire is arranged in the groove of the aluminum slot wire in a threading mode, then the two rolls of soldering tin round wires are symmetrically embedded into the groove between the aluminum slot wire and the superconducting round wire, and finally the aluminum slot wire WIC superconducting wire is obtained through induction heating and online tin melting. The method solves the technical problems that a conventional preparation method of the aluminum slot wire WIC superconducting wire is low in production efficiency, multiple in wire soldering tin filling unevenness defect, low in RRR value and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of superconducting wires and relates to an aluminum slot wire WIC superconducting wire and a preparation method thereof. Background Art

[0002] Aluminum channel wire WIC (Wire in channel) superconducting wire is a WIC superconducting wire that replaces copper channel wire with aluminum channel wire. It can be used for NbTi, Nb 3 Sn、MgB 2 , Bi-2212 and other superconductors. Aluminum slotted WIC superconducting wire can utilize the zero resistance characteristics of superconducting materials to achieve efficient and lossless transmission of current; at the same time, due to its structure and material composition, it also has high strength, light weight and good stability. Aluminum slotted WIC superconducting wire is mainly used in the field of maglev transportation and in the manufacture of superconducting magnets. It is a key material for maglev trains to achieve efficient and stable suspension and propulsion. The conventional preparation method of aluminum slotted WIC superconducting wire is to embed the superconducting round wire into the groove of the aluminum slotted wire, perform argon arc welding under argon conditions, and polish and clean the welds after welding. The disadvantages of the conventional preparation method of aluminum slotted WIC superconducting wire are that the welding stability is poor, and defects such as raised welds, pores and inclusions are easily generated at the weld, which is very dependent on the operator's experience; the welding process is unstable, which can easily cause local performance degradation of the superconducting wire. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problems of low production efficiency, uneven solder filling defects and low RRR value of conventional preparation methods of aluminum slot wire WIC superconducting wires. To this end, the present invention provides an aluminum slot wire WIC superconducting wire and a preparation method thereof to solve this need in the art.

[0004] On the one hand, the present invention relates to a method for preparing an aluminum slot wire WIC superconducting wire, which comprises: selecting a processing part according to a process for preparing an aluminum slot wire WIC superconducting wire, wherein the processing part comprises an aluminum slot wire, a superconducting round wire and two rolls of solder round wire; The superconducting round wire is threaded into the groove of the aluminum slot wire, and then the two rolls of solder round wire are symmetrically embedded in the groove between the aluminum slot wire and the superconducting round wire. Finally, the aluminum slot wire WIC superconducting wire is obtained through induction heating and online tin melting.

[0005] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the superconducting round wire is selected from NbTi / Cu superconducting round wire, Nb 3 Sn superconducting round wire, MgB 2 One of superconducting round wire or Bi-2212 superconducting round wire.

[0006] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the temperature of the induction heating is 350-500° C., and the speed is 80-200 m / min.

[0007] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the specification of the superconducting round wire is Φ1.2mm~Φ1.8mm.

[0008] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the diameter of the groove in the aluminum slot wire is 0.01-0.05 mm higher than the diameter of the superconducting round wire.

[0009] Furthermore, in the method for preparing the aluminum channel wire WIC superconducting wire provided by the present invention, the specifications of the two rolls of solder round wire are Φ0.25mm~Φ5.0mm.

[0010] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the inner R angle and the outer R angle of the aluminum slot wire are the same.

[0011] Furthermore, in the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention, the inner R angle and the outer R angle of the aluminum slot wire are 0.3-0.4 mm.

[0012] On the other hand, the present invention relates to an aluminum slot wire WIC superconducting wire, which is prepared by the preparation method of the aluminum slot wire WIC superconducting wire.

[0013] Furthermore, in the aluminum slot wire WIC superconducting wire provided by the present invention, the RRR value detected under the condition of 273K / 10K is not less than 100.

[0014] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects or advantages: The present invention solves the problems existing in traditional aluminum slot line WIC superconducting wires, such as dependence on operator experience, poor welding stability, and insufficient production capacity, and explores an online tin melting method, which can achieve continuous and stable welding, higher production efficiency, and better forming effect. The preparation route of aluminum slot line WIC superconducting wires BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1A schematic diagram of a processing part for the method for preparing the aluminum slot wire WIC superconducting wire provided by the present invention.

[0017] Figure 2 A schematic diagram of a weld in the method for preparing the aluminum channel wire WIC superconducting wire provided by the present invention.

[0018] Description of the accompanying drawings: 1. Superconducting round wire; 2. Solder round wire; 3. Aluminum slot wire; 4. Welding seam after melting of the solder round wire. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention is described below in conjunction with the embodiments, but the present invention is not limited to the following embodiments. The experimental methods and detection methods described in each embodiment are conventional methods unless otherwise specified; the reagents and materials can be purchased on the market unless otherwise specified. The % in the following embodiments, unless otherwise specified, are all mass percentages. The ratios in the following embodiments, unless otherwise specified, are all mass ratios.

[0020] Example 1 This embodiment provides a method for preparing an aluminum slot wire WIC superconducting wire.

[0021] First, assemble the cleaned and dried materials, and prepare a Φ1.2mm 36-core NbTi / Cu composite wire through welding, heat treatment and multiple drawing. Select a Φ4.0mm aluminum rod, flatten it once, and use a mold to form a rectangular shape. Roll it through a set of rectangular concave wheels and semicircular cams to form a Φ1.22mm groove. Finally, pass through the forming mold to make the aluminum groove wire have a smooth and consistent inner and outer R angle of 0.3mm. The aluminum groove wire prepared above is passed through the pickling tank, compressed air, rectangular mold, induction heating furnace, cooling water, traction machine and wire take-up machine in turn. The rectangular mold outlet and induction heating furnace must be placed in argon gas protection. Turn on the traction machine, and under the condition of slow speed of 40m / min, the round wire is embedded in the aluminum groove wire at the entrance of the rectangular mold, and then the 0.25mm solder wire is symmetrically embedded in the groove between the aluminum groove wire and the round wire in turn to obtain the following Figure 1 The schematic diagram of the workpiece is shown. According to the aluminum slot wire WIC superconducting wire preparation process, the induction heating temperature and equipment running speed are selected, the temperature is 350℃, the speed is 150m / min, and the aluminum slot wire WIC wire preparation with a specification of (3.0×2.1) mm is completed, as shown in FIG. Figure 2 As shown in the figure, the deep defect of the cold solder joint between the groove line and the round wire is characterized by the eddy current flaw detector, and the RRR value is 100 under the condition of 273K / 10K.

[0022] The conventional preparation method of the aluminum slot wire WIC superconducting wire is to embed the superconducting round wire into the groove of the aluminum slot wire, and prepare it by argon arc welding under argon gas conditions, and grind and clean the welding points after welding. Compared with the conventional preparation method of the aluminum slot wire WIC superconducting wire, the number of solder filling unevenness defects of the aluminum slot wire WIC superconducting wire prepared in this embodiment is 0, and the production efficiency is high and the RRR value is high.

[0023] Example 2 This embodiment provides a method for preparing an aluminum slot wire WIC superconducting wire.

[0024] First, the cleaned and dried materials are assembled, and the 84-core NbTi / Cu composite wire with a specification of Φ1.5mm is prepared by welding, heat treatment and multiple drawing. A Φ4.0mm aluminum rod is selected, flattened by one rolling, and rectangular formed by a mold. A set of rectangular concave wheels and semicircular cams are used for rolling to form a Φ1.53mm groove. Finally, the aluminum groove wire is passed through the forming mold to have a smooth inner and outer R angle of 0.3mm with consistent radius. The aluminum groove wire prepared above is passed through the pickling tank, compressed air, rectangular mold, induction heating furnace, cooling water, traction machine and wire take-up machine in turn, and the rectangular mold outlet and induction heating furnace must be placed in argon gas protection. Turn on the traction machine, and embed the round wire into the aluminum groove wire at the entrance of the rectangular mold under the condition of slow speed of 40m / min, and then symmetrically embed the 0.3mm solder wire into the groove between the aluminum groove wire and the round wire in turn. According to the preparation process of aluminum slotted WIC superconducting wire, the induction heating temperature and equipment running speed were selected, with a temperature of 380°C and a speed of 140m / min, to complete the preparation of aluminum slotted WIC wire with a specification of (3.5×2.4) mm. The deep defects of the virtual welding between the slotted wire and the round wire were characterized by an eddy current flaw detector, and the RRR value was 105 under the conditions of 273K / 10K.

[0025] The conventional preparation method of the aluminum slot wire WIC superconducting wire is to embed the superconducting round wire into the groove of the aluminum slot wire, and prepare it by argon arc welding under argon gas conditions, and grind and clean the welding points after welding. Compared with the conventional preparation method of the aluminum slot wire WIC superconducting wire, the number of solder filling unevenness defects of the aluminum slot wire WIC superconducting wire prepared in this embodiment is 0, and the production efficiency is high and the RRR value is high.

[0026] Example 3 This embodiment provides a method for preparing an aluminum slot wire WIC superconducting wire.

[0027] First, the cleaned and dried materials are assembled, and a Φ1.8mm 55-core NbTi / Cu composite wire is prepared by welding, heat treatment and multiple drawing. A Φ4.0mm aluminum rod is selected, flattened by one rolling, and rectangular formed by a mold. A Φ1.83mm groove is formed by rolling through a set of rectangular concave wheels and semicircular cams. Finally, the aluminum groove wire is passed through the forming mold to have a smooth inner and outer R angle of 0.4mm with consistent radius. The aluminum groove wire prepared above is passed through the pickling tank, compressed air, rectangular mold, induction heating furnace, cooling water, traction machine and wire take-up machine in turn, and the rectangular mold outlet and induction heating furnace must be placed in argon gas protection. Turn on the traction machine, and embed the round wire into the aluminum groove wire at the entrance of the rectangular mold under the condition of slow speed of 40m / min, and then symmetrically embed the 0.4mm solder wire into the groove between the aluminum groove wire and the round wire in turn. According to the preparation process of aluminum slotted WIC superconducting wire, the induction heating temperature and equipment running speed were selected, the temperature was 400℃, the speed was 110m / min, and the preparation of aluminum slotted WIC wire with a specification of (4.0×2.6)mm was completed. The deep defects of the virtual welding between the slotted wire and the round wire were characterized by the eddy current flaw detector, and the RRR value was 110 under the condition of 273K / 10K.

[0028] The conventional preparation method of the aluminum slot wire WIC superconducting wire is to embed the superconducting round wire into the groove of the aluminum slot wire, and prepare it by argon arc welding under argon gas conditions, and grind and clean the welding points after welding. Compared with the conventional preparation method of the aluminum slot wire WIC superconducting wire, the number of solder filling unevenness defects of the aluminum slot wire WIC superconducting wire prepared in this embodiment is 0, and the production efficiency is high and the RRR value is high.

[0029] As described above, the basic principle, main features and advantages of the present invention are well described. The above embodiments and descriptions are only descriptions of the preferred implementation modes of the present invention, and the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, various changes and improvements made by ordinary technicians in this field to the technical solution of the present invention should fall within the protection scope determined by the present invention.

Claims

1. A method for preparing an aluminum slot wire WIC superconducting wire, characterized in that: include: Selecting workpieces according to the aluminum slot wire WIC superconducting wire preparation process, the workpieces include aluminum slot wire, superconducting round wire and two rolls of solder round wire; The superconducting round wire is threaded into the groove of the aluminum slot wire, and then the two coils of solder round wire are symmetrically embedded in the groove between the aluminum slot wire and the superconducting round wire. Finally, the aluminum slot wire WIC superconducting wire is obtained through induction heating and online tin melting.

2. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The superconducting round wire is selected from one of NbTi / Cu superconducting round wire, Nb3Sn superconducting round wire, MgB2 superconducting round wire or Bi-2212 superconducting round wire.

3. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The induction heating temperature is 350-500° C., and the speed is 80-200 m / min.

4. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The specification of the superconducting round wire is Φ1.2mm~Φ1.8mm.

5. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The diameter of the groove in the aluminum groove wire is 0.01-0.05 mm higher than the diameter of the superconducting round wire.

6. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The specifications of the two coils of solder round wire are Φ0.25mm~Φ4.0mm.

7. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The inner R angle and the outer R angle of the aluminum channel line are the same.

8. The method for preparing the aluminum slot wire WIC superconducting wire according to claim 1, characterized in that: The inner R angle and the outer R angle of the aluminum groove line are 0.3-0.4 mm.

9. An aluminum slot wire WIC superconducting wire, characterized in that: The aluminum slot wire WIC superconducting wire is prepared by the preparation method of any one of claims 1 to 8.

10. The aluminum slot wire WIC superconducting wire according to claim 9, characterized in that: The RRR value detected under 273K / 10K conditions is not less than 100.

Images