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Preparation method for Bi-2212 high-temperature superconducting wires

A bi-2212, high-temperature superconducting technology, applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., can solve the limitation of wire current carrying performance, wire performance degradation, poor grain arrangement, etc. problem, to achieve the effect of high practical value, low manufacturing cost and high production efficiency

Active Publication Date: 2010-05-26
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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Problems solved by technology

However, both the conventional PIT technology and the semi-melting process have inherent disadvantages: when the wire is prepared by the PIT method, the powder is loaded into the tube and the gas is also loaded into the silver tube at the same time. These gases will expand rapidly during heat treatment at high temperature. It caused the swelling of the Bi-2212 wire, resulting in a sharp decline in the performance of the wire; while the Bi-2212 wire strip prepared by the semi-melting method was only arranged in the orientation of the Bi-2212 grains with a thickness of 1 μm near the silver layer, and most of the grains in the center The arrangement is poor, which limits the improvement of the current-carrying performance of the wire

Method used

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  • Preparation method for Bi-2212 high-temperature superconducting wires
  • Preparation method for Bi-2212 high-temperature superconducting wires

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preparation example Construction

[0023] Such as figure 1 Shown, the preparation method of a kind of Bi-2212 high temperature superconducting wire of the present invention comprises the following steps:

[0024] Step 1, drawing processing and obtaining intermediate-sized filaments of the Bi-2212 high temperature superconducting wire rod, the drawing processing process is as follows:

[0025] 101. Fill the pure silver tube with Bi-2212 superconducting powder until it is full, and close the two ends of the pure silver tube with metal plugs to make a composite;

[0026] 102. Use drawing equipment to draw the primary complex into filaments 1 with a diameter of Φ1.5-2.2 mm, and then use cutting equipment to cut the filaments into 55-91 segments on average, and then cut the filaments into 55-91 segments. The cut filaments of 55-91 segments are arranged in a regular hexagonal arrangement and assembled into a pure silver tube to obtain a secondary composite with 55-91 cores; the inner diameter of the pure silver tube...

Embodiment 1

[0032] In this embodiment, when preparing the Bi-2212 high temperature superconducting wire, the preparation process includes the following steps:

[0033] Step 1, drawing processing and obtaining intermediate-sized filaments of the Bi-2212 high temperature superconducting wire rod, the drawing processing process is as follows:

[0034] 101. Fill the pure silver tube with Bi-2212 superconducting powder until it is full, and close the two ends of the pure silver tube with metal plugs to make a composite;

[0035]102. Use drawing equipment to draw the primary complex into filaments 1 with a diameter of Φ1.92 mm, and then use cutting equipment to cut the filaments into 61 segments on average, and then cut the 61 segments The filaments are arranged in a regular hexagonal arrangement and assembled into a pure silver tube to obtain a 61-core secondary composite; the inner diameter of the pure silver tube corresponds to the size of the regular hexagonal structure formed by an arrange...

Embodiment 2

[0041] In this embodiment, the difference from Embodiment 1 is that in step 102, drawing equipment is used to draw the primary composite body into a filament with a diameter of Φ1.94mm, and secondly, a cutting device is used to cut the filament into a Cut into 55 segments on average, and then arrange the 55 segments of filaments according to the regular hexagonal arrangement and assemble them into the pure silver tube to obtain a 55-core secondary composite; The dimensions of the regular hexagonal structure composed of filaments correspond to each other;

[0042] In step 103, drawing equipment is used to draw the 55-core secondary complex into filaments 2 with a diameter of Φ5mm, and then cutting equipment is used to cut the filaments 2 into 7 sections on average, and then the 7 sections cut into The two filaments are arranged in a regular hexagonal arrangement and assembled into the AgMn alloy tube to obtain a tertiary composite with 385 cores; the inner diameter of the AgMn ...

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Abstract

The invention discloses a preparation method for Bi-2212 high-temperature superconducting wires. The preparation method for Bi-2212 high-temperature superconducting wires comprises the following steps of: 1, drawing and machining raw materials to obtain intermediate size filaments of Bi-2212 high-temperature superconducting wires; 2, performing high temperature sintering on the intermediate size filaments at the temperature of between 800 and 880 DEG C by using a high temperature sintering furnace to obtain intermediate size filament sintered blanks, and then machining intermediate size filament sintered blanks into a design size by using a drawing apparatus to obtain initial products of the Bi-2212 high-temperature superconducting wires; and 3, performing semi-molting treatment on the initial products of the Bi-2212 high-temperature superconducting wires in the atmosphere of pure oxygen by using a high temperature atmosphere melting furnace. The method has simple, easy and practical steps; the prepared Bi-2212 high-temperature superconducting wires have excellent performance; and bubbling phenomenon of the wires in the process of semi-melting heat treatment is avoided, and meanwhile crystal grain arrangement of the Bi-2212in the wires is also improved and current-carrying performance and uniformity of the wires are also improved.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting wire preparation, and in particular relates to a preparation method of Bi-2212 high-temperature superconducting wire. Background technique [0002] Since Bi-2212 high-temperature superconductor has excellent low-temperature high-field current-carrying properties, and is the only high-temperature superconducting material that can be prepared into isotropic round wires, the above characteristics make Bi-2212 high-temperature superconductor materials ideal for low-temperature high-field magnet intercalation. Preferred material for coils. [0003] At present, the preparation technology combining the powder-in-tube (PIT) method and the semi-melting method is the basis for the preparation of high-performance Bi-2212 wire. into a multi-core composite, and then processed to the designed wire size, and then semi-melted at about 900°C to obtain the finished wire. However, both the...

Claims

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Application Information

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IPC IPC(8): H01B13/00H01B12/10
CPCY02E40/644Y02E40/60
Inventor 郝清滨李成山闫元媛李高山熊晓梅贾佳林杜明焕
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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