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Preparation method of MgB2 multi-core superconducting wire/tape

A technology of superconducting wires and strips, applied in the usage of superconducting elements, superconducting/high-conducting conductors, superconducting devices, etc., can solve problems such as critical current attenuation, low wire filling rate, and sheath rupture, etc., to achieve The effect of increasing the critical current density

Active Publication Date: 2018-09-07
西部超导材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the coarse particle size of the existing Mg powder in the market, there is a problem that the sheath is broken due to the accumulation of Mg powder in the process of processing multi-core and long wires; and the coarse Mg powder melts and diffuses to B after heat treatment, resulting in relatively large wires in the wire. large holes, so that the filling rate of the wire becomes low, the connectivity becomes poor, and its superconducting performance is damaged; in addition, the coarse Mg powder is heat-treated to obtain MgB with larger grain size 2 , while MgB 2 Superconducting materials mainly improve superconducting performance through grain boundary pinning. Coarse MgB 2 The grain will reduce the effective pinning center, causing the critical current to decay quickly under the external magnetic field

Method used

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  • Preparation method of MgB2 multi-core superconducting wire/tape

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Experimental program
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Effect test

Embodiment 1

[0022] Step 1: Powder Preparation

[0023] Mg(BH 4 ) 2 , Mg and B powder according to Mg(BH 4 ) 2 The mass ratio of Mg powder and B powder is 19:100, and the atomic ratio of Mg powder and B powder is 1:2. After grinding in the glove box for 1 hour, put it into a stainless steel tube and seal it; then put the stainless steel tube containing the powder into In the heat treatment furnace, flowing N 2 , heating the furnace body to 380° C. and keeping it warm for 2 hours to obtain the precursor powder.

[0024] Step 2: Single Mandrel Processing

[0025] The precursor powder was loaded into a Nb tube in a glove box, and then the powder-filled Nb tube was loaded into a Cu tube, which was machined to Φ2.95 mm by swaging or drawing with a pass processing rate of 20% , to get circular Cu / Nb / MgB 2 Single mandrel.

[0026] Step 3: Preparation of Monel / Cu Center Rod

[0027] Put the Cu rod into the Monel tube, adopt 20% pass processing rate, and draw it to Φ2.95mm to obtain a circ...

Embodiment 2

[0034] Step 1: Powder Preparation

[0035] Mg(BH 4 ) 2 , Mg and B powder according to Mg(BH 4 ) 2 The mass ratio of Mg powder and Mg powder is 19:80, and the atomic ratio of Mg powder and B powder is 1:2. After grinding in the glove box for 1.5h, put it into a stainless steel tube and seal it; then put the stainless steel tube with powder Put it into the heat treatment furnace, turn on the mechanical pump, and evacuate the furnace body. After reaching 6.7Pa, turn on the diffusion pump. After 1 hour, heat the furnace body to 400°C and keep it warm for 40 minutes to obtain the precursor powder.

[0036] Step 2: Single Mandrel Processing

[0037] In the glove box, the precursor powder was loaded into the Nb tube, and then the Nb tube filled with powder was loaded into the Cu tube, and the processing rate of 15% was used to draw to Φ3.8mm to obtain a circular Cu / Nb tube. / MgB 2 Single mandrel.

[0038] Step 3: Preparation of Monel / Cu Center Rod

[0039] Put the Cu rod into...

Embodiment 3

[0045] Step 1: Powder Preparation

[0046] Mg(BH 4 ) 2 , Mg and B powder according to Mg(BH 4 ) 2 The mass ratio of Mg powder and Mg powder is 19:40, and the atomic ratio of Mg powder and B powder is 1:2. After grinding in the glove box for 2 hours, put it into a stainless steel tube and seal it; then put the stainless steel tube with the powder into In the heat treatment furnace, flowing N 2 , heated to 340° C., and kept for 8 hours to obtain the precursor powder.

[0047] Step 2: Single Mandrel Processing

[0048] The precursor powder is loaded into the Nb tube, and then the powder-filled Nb tube is loaded into the Cu tube, and the pass processing rate of 12% is used to draw to H4.2mm to obtain Cu / Nb / MgB 2 Hexagon stick.

[0049] Step 3: Preparation of Monel / Cu Center Rod

[0050] Put the Cu rod into the Monel tube, adopt 12% pass processing rate, and draw it to H4.2mm to prepare the Monel / Cu center rod.

[0051] Step 4: Composite Rod Processing

[0052] Prepare st...

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Abstract

The invention discloses a preparation method of an MgB2 multi-core superconducting wire / tape. The preparation method comprises the steps that a certain amount of Mg(BH4)2 is added into Mg powder and Bpowder, the powder is pretreated, then Cu / Nb / MgB2 single-core rods and Monel / Cu center rods are prepared and assembled into an n+m-core composite sheath, wherein n is the number of the Cu / Nb / MgB2 single-core rods, and m is the number of the Monel / Cu center rods; and then a wire / tape is prepared by means of the modes of rotary swaging, drawing, groove rolling and flat seizing, and finally heat treatment is conducted to obtain the MgB2 multi-core superconducting wire / tape. Compared with a tape which is prepared without doping the Mg(BH4)2 precursor powder, the wire / tape prepared through the method has the advantage that the critical current density is increased by 42.31%, has the more excellent superconducting performance and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of superconducting wire / strip preparation, in particular to a MgB 2 A method for preparing a multi-core superconducting wire / ribbon. Background technique [0002] MgB 2 Superconducting materials are currently considered to be the most suitable for medical magnetic resonance imaging (MRI) at the operating temperature of refrigerators due to their high superconducting transition temperature (39K), no weak grain connection, easy processing and low cost. Materials used for superconducting magnets. [0003] Powder tube method is the current preparation of MgB 2 The main methods of superconducting wires / tapes are divided into in-situ PIT and ex-situ PIT according to different precursors. The in-situ method uses the mixed powder of Mg powder and B powder as the precursor powder, puts it into a metal composite tube, processes it into a wire / strip, and then heats it. During this process, the molten Mg diffuses to...

Claims

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Application Information

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IPC IPC(8): H01B12/04H01B13/00H01L39/12
CPCH01B12/04H01B13/00H10N60/85Y02E40/60
Inventor 郗丹潘熙锋王大友崔利军陈传侯艳荣王韵涵闫果刘向宏冯勇张平祥
Owner 西部超导材料科技股份有限公司
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