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Preparation method of PbMo6S8 superconducting wire

A technology of superconducting wires and wires, which is applied in superconducting magnets/coils, inductors/transformers/magnets, and the magnetism of inorganic materials. It can solve the problems of low critical current density performance of superconductors, and is conducive to large-scale promotion and application. , Improve the critical current density Jc performance, the effect of huge commercial value

Active Publication Date: 2020-08-18
合肥夸夫超导科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts MRHQ and phase formation annealing heat treatment process, replaces common solid phase sintering process, obtains high critical current density PbMo6S8 superconductor with excellent grain connection performance , which solves the shortcomings of the traditional PbMo6S8 superconductor with low critical current density

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] PbMo 6 S 8 Preparation method of superconducting wire

[0033] Step 1: Make PMS Precursor Powder

[0034] Take PbS powder and MoS powder with a particle size of 400 mesh 2 Mix with Mo powder according to the ratio of Pb, Mo and S atomic ratio of 1:6:8, put it into the high-energy ball mill jar in the glove box, the ball-to-material ratio is 10:1, and obtain the PMS precursor powder by high-energy ball milling for 10 hours.

[0035]Step 2: Make PMS Single Mandrel

[0036] 200 g of the PMS precursor powder obtained in step 1 was loaded into a Mo tube with an outer diameter of 10.0 mm and a wall thickness of 1.25 mm for repeated drawing to produce a Mo / PMS single mandrel with a diameter of 1.0 mm.

[0037] Step 3: Make PMS multi-core composite wire

[0038] Put 30 Mo / PMS single mandrels obtained in step 2 and 7 central Cu rods of the same size into a stainless steel tube with an inner diameter of 15 mm and a wall thickness of 2 mm, and adopt the method of roller die d...

Embodiment 2

[0045] PbMo 6 S 8 Preparation method of superconducting wire

[0046] Step 1: Make PMS Precursor Powder

[0047] Take PbS powder and MoS powder with a particle size of 400 mesh 2 Mix with Mo powder according to the ratio of Pb, Mo and S atomic ratio of 1:6:8, put it into the high-energy ball mill tank in the glove box, the ball-to-material ratio is 10:1, and obtain the PMS precursor powder by high-energy ball milling for 15 hours.

[0048] Step 2: Make PMS single core wire

[0049] 300 g of the PMS precursor powder obtained in step 1 was loaded into a Mo tube with an outer diameter of 12.0 mm and a wall thickness of 1.5 mm for repeated drawing to produce a Mo / PMS single mandrel with a diameter of 2 mm.

[0050] Step 3: Make PMS multi-core composite wire

[0051] Put 30 Mo / PMS single mandrels obtained in step 2 and 7 central Cu rods of the same size into a Monel400 tube with an inner diameter of 16 mm and a wall thickness of 1.5 mm, and use the method of roller die drawing...

Embodiment 3

[0058] PbMo 6 S 8 Preparation method of superconducting wire

[0059] Step 1: Make PMS Precursor Powder

[0060] Take PbS powder and MoS powder with a particle size of 400 mesh 2 Mix with Mo powder according to the ratio of Pb, Mo and S atomic ratio of 1:6:8, put it into the high-energy ball mill jar in the glove box, the ball-to-material ratio is 10:1, and obtain the PMS precursor powder by high-energy ball milling for 20 hours.

[0061] Step 2: Make PMS single core wire

[0062] 250 g of the PMS precursor powder obtained in step 1 was loaded into a Mo tube with an outer diameter of 10.0 mm and a wall thickness of 1.25 mm for repeated drawing to produce a Mo / PMS single mandrel with a diameter of 3 mm.

[0063] Step 3: Make PMS multi-core composite wire

[0064] Put 18 Mo / PMS single mandrels obtained in step 2 and a central Cu rod of the same size into a stainless steel tube with an inner diameter of 16 mm and a wall thickness of 2 mm, and adopt the method of roller die d...

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Abstract

The invention discloses a preparation method of a PbMo6S8 superconducting wire. The method comprises the steps that: precursor powder is prepared through adoption of a high-energy ball milling method;then, the PbMo6S8 precursor powder is put into a Mo pipe; the Mo pipe is processed into a PMS single-core wire / bar; and then a plurality of PMS single-core wires / rods and a central copper wire / rod are loaded into a stainless steel pipe or a Monel 400 jacketed pipe for secondary assembly, a multi-core PMS precursor wire rod is manufactured through stretching, and the wire rod is subjected to high-temperature melting quenching treatment and phase-forming heat treatment to obtain the PMS superconducting wire rod. MRHQ and phase-forming heat treatment are adopted to replace traditional diffusionphase-forming heat treatment, intergranular impurities in the superconductor are remarkably reduced, grain connectivity is improved, and therefore the critical current density of the wire is remarkably improved. The method is simple, is suitable for preparing the superconducting long wire, is beneficial to large-scale popularization and application, and has huge commercial value.

Description

technical field [0001] The invention belongs to the technical field of low-temperature superconducting materials, in particular to a PbMo 6 S 8 (abbreviation: PMS) superconducting wire preparation method. Background technique [0002] Low-temperature superconducting materials refer to superconductors working at liquid helium temperature (4.2 K), and their superconducting transition temperature ( T c ) usually below 25 K, satisfying the BCS theory on the superconducting mechanism. Nb-Ti and Nb 3 Sn superconductor is currently the most widely used low-temperature superconducting material; Nb-Ti T c is 9.8 K, the upper critical magnetic field ( H c2 ) is 10.8 T at 4.2 K; Nb 3 Sn's T c for 17-18K, H c2 21.5T at 4.2K. [0003] Nb-Ti is a binary metal alloy superconductor, the wire processing is relatively easy, the performance is stable, and the cost is low, so it is widely used in the production of superconducting magnets below 10 T; for example: nuclear magnetic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F6/00H01F1/34
CPCH01F41/02H01F6/00H01F1/34Y02E40/60
Inventor 庄彬潘熙锋罗文宇许涛林鹤
Owner 合肥夸夫超导科技有限公司
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