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Preparation method of high temperature superconductive coating conductor buffer layer

A coated conductor and high-temperature superconducting technology, applied in the field of high-temperature superconducting material preparation, can solve problems such as slow preparation speed, complicated equipment, and difficulty in long strips, and achieve low equipment cost, good c-axis texture, and small surface roughness degree of effect

Inactive Publication Date: 2011-11-16
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently Nd 2 Zr 2 o 7 and Sm 2 Zr 2 o 7 Vacuum physical deposition is mostly used in the preparation technology, and its technical characteristics are that it is easy to obtain high-performance thin films, but the equipment is complex, the preparation speed is slow, the cost is high, and it is difficult to prepare practical long tapes.

Method used

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  • Preparation method of high temperature superconductive coating conductor buffer layer
  • Preparation method of high temperature superconductive coating conductor buffer layer
  • Preparation method of high temperature superconductive coating conductor buffer layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Nd(acac) 3 2H 2 O and Zr(acac) 4 Mix by a molar ratio of 1:1, then add an organic solvent to the mixture to prepare a precursor solution with a molar concentration of cations of 0.4mol / L; the organic solvent is a mixed solvent of propionic acid and methanol, and in the mixed solvent propionic acid and methanol The volume ratio is 3:2;

[0036] (2) Add 50 μL of the precursor solution described in step (1) dropwise on the ultrasonically cleaned YSZ single crystal substrate (10mm×10mm), and spin coat it with a spin coater at a rotation rate of 2500 rpm for 30s. Apply the precursor solution evenly on the substrate, and then dry it at a temperature not higher than 200°C;

[0037] (3) The YSZ single crystal substrate after drying in the step (2) is placed in the tube furnace, and the gas flow rate is 48L / h Ar-4%H 2 Under the atmosphere, heat up to 500°C at a heating rate of 25°C / min and then hold for 1 hour, then continue to heat up to 1000°C at a heating rate of 25°C...

Embodiment 2

[0041] The preparation method of this embodiment is the same as that of Example 1, wherein the difference is that the raw material used is Sm(acac) 3 ·H 2 O, prepared Sm with good c-axis texture and small surface roughness (RMS less than 5nm) 2 Zr 2 o 7 The buffer layer.

[0042] Sm prepared in this example 2 Zr 2 o 7 The X-ray diffraction pattern of the buffer layer is as Figure 5 , Sm 2 Zr 2 o 7 The ω-scan spectrum of the buffer layer is as follows Image 6 , Sm 2 Zr 2 o 7 The Φ scan pattern of the buffer layer is as follows Figure 7 , Sm 2 Zr 2 o 7 The atomic force microscope (AFM) photograph of the buffer layer is as Figure 8 .

[0043] from Figure 5 It can be seen that, except for the (200), (400) diffraction peaks of the YSZ single crystal substrate and the K β Outside the peak, only Sm 2 Zr 2 o 7 The (400) and (800) diffraction peaks of the film indicate that only a single Sm 2 Zr 2 o 7 phase with a c-axis orientation. from Image 6 and ...

Embodiment 3

[0045] (1) Nd(acac) 3 2H 2 O and Zr(acac) 4 Mix by a molar ratio of 1:1, then add an organic solvent to the mixture to prepare a precursor solution with a molar concentration of cations of 0.4mol / L; the organic solvent is a mixed solvent of propionic acid and methanol, and in the mixed solvent propionic acid and methanol The volume ratio is 3:2;

[0046] (2) Add 50 μL of the precursor solution described in step (1) dropwise on the Ni-W alloy substrate (10mm×10mm) after ultrasonic cleaning, and spin-coat at a spin rate of 2500 rpm for 30s with a coater , so that the precursor solution is evenly coated on the substrate, and then dried at a temperature not higher than 200°C;

[0047] (3) Place the Ni-W alloy substrate after drying in the step (2) in the tube furnace, and in the Ar-4%H that the gas flow rate is 48L / h 2 Under the atmosphere, heat up to 300°C at a heating rate of 25°C / min and then hold for 1 hour, then continue to heat up to 1000°C at a heating rate of 25°C / min ...

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Abstract

The invention discloses a preparation method of a high temperature superconductive coating conductor buffer layer, which is characterized in that the invention comprises the following steps: neodymium acetylacetonate or samarium acetylacetone is mixed with zirconium acetylacetonate according to a mol ratio of 1:1, adding an organic solvent to prepare a precursory solution, then performing a spin coating of the precursory solution on a substrate and drying, then placing the dried substrate into a tubular furnace, performing a heat treatment step by step in the condition of flowing mixed atmosphere of argon and hydrogen to obtain a Nd2Zr2O7 buffer layer or a Sm2Zr2O7 buffer layer. The present invention has the advantages of simple technology, low cost, no environment pollution, easy operation and control, and is capable of applying to a large-scale production preparation. The Nd2Zr2O7 buffer layer and the Sm2Zr2O7 buffer layer prepared by using the method of the present invention has favorable c shaft texture and little surface roughness, smooth surface without micro-crack, which is beneficial to the growth of the high temperature superconducting layer on the texture of the buffer layers provided in the invention.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to a method for preparing a high-temperature superconducting coated conductor buffer layer. Background technique [0002] High-temperature superconducting coated conductor has become the material of choice to replace the first generation of practical high-temperature superconducting materials due to its superior high-field performance. The coated conductor is a multi-layer film structure composed of substrate / buffer layer / superconducting layer / protective layer. At present, the research and preparation of high-temperature superconducting coated conductors have reached a certain scale, but the expensive production cost is the main factor restricting the practical application. Therefore, it is urgent to use low-cost deposition technology to realize the rapid practical application of high-temperature superconducting coated condu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50
Inventor 申雅卢亚锋李成山于泽铭金利华王耀王鹏飞张国防
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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