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Method for preparing Bi high temperature superconducting line or strip material

A high-temperature superconducting and tape technology, applied in cable/conductor manufacturing, electrical components, circuits, etc., can solve the problem of uneven wire/strip silver super interface, difference in hardness between metallic silver and superconducting core, wire/strip The problem of current-carrying performance is reduced, and the effect of improving the silver super interface, lowering the manufacturing cost and improving the current-carrying performance is achieved.

Active Publication Date: 2013-12-11
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for pure metal or alloy materials, the annealing temperature has been calculated by a classic formula. For pure silver and silver alloy, the annealing temperature is 400°C. This temperature annealing will eliminate all processing dislocations in the metal. The hardness of metallic silver is reduced by 80%, and its Vickers hardness is only 25 kg / mm 2 , while the hardness of the ceramic core decreases less, which increases the difference in hardness between the metallic silver and the superconducting core, resulting in serious roughness at the wire / strip silver superinterface, resulting in a sharp drop in the current-carrying performance of the wire / strip decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1. Put the Bi-2212 precursor powder into the silver tube, and then seal the two ends of the silver tube with metal plugs to obtain a primary composite; the Vickers hardness of the silver tube is 95kg / mm 2 ; The material of the metal plug is silver;

[0030] Step 2, drawing the primary complex described in step 1, and then annealing the drawn primary complex to obtain a wire rod with a hexagonal cross-section with a side-to-side distance of 2 mm; the drawing pass processing The rate is 5%; the temperature of the annealing treatment is 150°C, the holding time is 20min, and the Vickers hardness of the silver sheath after annealing is 95kg / mm 2 ;

[0031] Step 3: Bundle 55 wires described in Step 2 and put them into a silver-manganese alloy tube (Ag-0.3Mn) to make a secondary composite with 55 cores; the Vickers hardness of the silver-manganese alloy tube is 97kg / mm 2 ;

[0032] Step 4, drawing the secondary composite body described in step 3, and then annealing t...

Embodiment 2

[0036] Step 1. Put the Bi-2212 precursor powder into the silver tube, and then seal the two ends of the silver tube with metal plugs to obtain a primary composite; the Vickers hardness of the silver tube is 95kg / mm 2 ; The material of the metal plug is copper;

[0037] Step 2, drawing the primary complex described in step 1, and then annealing the drawn primary complex to obtain a wire rod with a hexagonal cross-section with a side-to-side distance of 2 mm; the drawing pass processing The rate is 10%; the temperature of the annealing treatment is 150°C, the holding time is 10min, and the Vickers hardness of the annealed silver sheath is 98kg / mm 2 ;

[0038]Step 3: Pack 666 wires described in Step 2 into a silver-magnesium alloy tube (Ag-3Mg) to form a secondary composite with 666 cores; the Vickers hardness of the silver-magnesium alloy tube is 97kg / mm 2 ;

[0039] Step 4, drawing the secondary complex described in step 3, and then annealing the drawn secondary complex to...

Embodiment 3

[0043] Step 1. Put the Bi-2223 precursor powder into the silver tube, and then seal the two ends of the silver tube with metal plugs to obtain a primary composite; the Vickers hardness of the silver tube is 95kg / mm 2 ; The material of the metal plug is silver-copper alloy;

[0044] Step 2, drawing the primary complex described in step 1, and then annealing the drawn primary complex to obtain a wire rod with a hexagonal cross-section with a side-to-side distance of 2 mm; the drawing pass processing The rate is 10%; the temperature of the annealing treatment is 180°C, the holding time is 1min, and the Vickers hardness of the annealed silver sheath is 96kg / mm 2 ;

[0045] Step 3. Pack 37 wires described in Step 2 into a silver-magnesium-nickel alloy tube (Ag-0.24Mg-0.18Ni) to form a secondary complex with 37 cores; the silver-magnesium-nickel alloy tube Vickers hardness is 98kg / mm 2 ;

[0046] Step 4, drawing the secondary complex described in step 3, and then annealing the d...

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Abstract

The invention discloses a method for preparing a Bi high temperature superconducting line or strip material. The method comprises the following steps: firstly, preparing a primary composite body; secondly, drawing the primary composite body, and then annealing the drawn primary composite body so as to obtain a line material; thirdly, bundling a plurality of line materials, and then packing into a silver-base alloy pipe so as to prepare a secondary composite body; fourthly, drawing the secondary composite body, and then annealing the drawn secondary composite body so as to obtain a Bi line material; and fifthly, putting the Bi line material into an atmosphere furnace for heat treatment so as to obtain the Bi high temperature superconducting line material; or rolling the Bi line material into a Bi strip material, and then putting into the atmosphere furnace for heat treatment so as to obtain the Bi high temperature superconducting strip material. According to the method, the manufacturing dislocation quantity of silver and silver-manganese alloy is effectively controlled by adopting an unconventional annealing process, so that the phenomenon that a silver super interface is severely rough caused by an excessively soft silver sheath is effectively avoided, and the current-carrying performance of the Bi line or strip material is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of Bi-based high-temperature superconducting wire strips, and in particular relates to a preparation method of Bi-based high-temperature superconducting wires / strips. Background technique [0002] Bi-based high-temperature superconductors (Bi 2 Sr 2 CaCu 2 o x and Bi 2 Sr 2 Ca 2 Cu 3 o x ) is the most important branch of high-temperature superconducting materials. Because of its easy processing and high current-carrying performance, Bi-based high-temperature superconductors have become one of the most promising high-temperature superconducting materials. [0003] At present, the powder-in-tube method (PIT) is the mainstream technology for preparing high-performance Bi-based high-temperature superconducting wires / tapes. This technology is to put the superconducting precursor powder into the silver tube, prepare a multi-core composite by drawing and assembling, and then process it to t...

Claims

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Application Information

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IPC IPC(8): H01B13/00
Inventor 李成山郝清滨张胜楠李高山熊晓梅刘国庆贾佳林张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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