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Method for preparing RexCe1-xOy/M2Zr2O7 double-layer buffer layer by chemical solution deposition

A technology of chemical solution deposition and buffer layer, which is applied in the direction of solid-state chemical plating, coating, metal material coating process, etc., can solve the problems that it is difficult to obtain a high-performance YBCO superconducting layer and the critical thickness of a single-layer buffer layer is small , to achieve the effects of increased critical thickness, reduced preparation cost, and easy large-scale industrial production

Inactive Publication Date: 2013-02-06
SOUTHWEST JIAOTONG UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CeO prepared by chemical method 2 The single-layer buffer layer has the problem of small critical thickness, which is not enough to play a barrier role
And in La 2 Zr 2 o 7 It is difficult to obtain high performance YBCO superconducting layer

Method used

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  • Method for preparing RexCe1-xOy/M2Zr2O7 double-layer buffer layer by chemical solution deposition
  • Method for preparing RexCe1-xOy/M2Zr2O7 double-layer buffer layer by chemical solution deposition

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: A kind of chemical solution deposition method prepares Sm 0.2 Ce 0.8 o 1.9 / La 2 Zr 2 o 7 The method of the double buffer layer consists of the following steps in turn:

[0026] a.La 2 Zr 2 o 7 (LZO) film preparation:

[0027] Appropriate amount of La(NO 3 ) 3 .6H 2 O and ZrO(NO 3 ) 3 .2H 2 O according to ion concentration La +3 : Zr +4 It is dissolved in ethylene glycol methyl ether at a ratio of 1:1, in which hydroxyethyl methyl ether is added according to the volume ratio of 1 mole (gadolinium nitrate + zirconium nitrate): 0.5-3 liters, and 5wt.% oxidized polyethylene 20000 synthetic colloid is added. The colloid was evenly spin-coated on the NiW base tape, and the obtained wet film was dried to remove the water, and then placed in a channel with H 2 In the heat treatment furnace with / Ar reducing atmosphere, the temperature was first raised to 350°C at a rate of 5°C / min to allow the organic matter and nitrate to be fully decomposed, an...

Embodiment 2

[0030] Embodiment 2: A kind of chemical solution deposition method prepares Gd 0.3 Ce 0.7 o 1.85 / Gd 2 Zr 2 o 7 The method of the double buffer layer consists of the following steps in turn:

[0031] a.Gd 2 Zr 2 o 7 (GZO) film preparation:

[0032] Appropriate amount of Gd(NO 3 ) 3 .6H 2 O and ZrO(NO 3 ) 3 .2H 2 O according to ion concentration Gd +3 : Zr +4 It is dissolved in ethylene glycol methyl ether at a ratio of 1:1, wherein hydroxyethyl methyl ether is added according to the volume ratio of 1 mole (gadolinium nitrate + zirconium nitrate): 0.5-3 liters, and 3wt.% oxidized polyethylene 20000 synthetic colloid is added. The colloid was coated on the NiW base tape by the pulling method, and the obtained wet film was dried to remove the water, and then placed in a H 2 In the heat treatment furnace with / Ar reducing atmosphere, first raise the temperature to 600°C at a rate of 1°C / min to fully decompose the organic matter and nitrate, then directly raise the...

Embodiment 1

[0035] In embodiment 1 and embodiment 2, implement with rare earth Sm and rare earth Gd, wherein rare earth yttrium (Y), lanthanum (La), praseodymium (Pr), neodymium (Nd), europium (Eu), terbium (Tb), Dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu) can all be implemented in the above manner.

[0036] figure 1 Sm prepared for the implementation case 0.2 Ce 0.8 o 1.9 / La 2 Zr 2 o 7 / NiW buffer layer X-ray diffraction pattern, it can be seen from the figure that all the prepared double-layer buffer layers have a good biaxial texture; Fig. 2 Sm 0.2 Ce 0.8 o 1.9 / La 2 Zr 2 o 7 / SEM picture of the NiW double-layer buffer layer. From the figure, it can be seen that the surface of the buffer layer is flat and dense, without microcracks, and has good surface properties.

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Abstract

The invention discloses a method for preparing an RexCe1-xOy / M2Zr2O7 double-layer buffer layer by chemical solution deposition, which comprises the following steps: a. preparation of M2Zr2O7 film: dissolving M(NO3)3.6H2O and ZrO(NO3)3.2H2O in hydroxyethyl methyl ether according to the ion concentration M+3:Zr+4 ratio of 1:1, and adding an oxidized polyethylene 20000 synthetic colloid; applying the colloid onto an Ni-base alloy baseband, drying, and putting the Ni-base alloy baseband into a heat treatment furnace in an H2 / Ar reducing atmosphere to carry out phase decomposition; and b. preparation of RexCe1-xOy film: preparing a rare earth nitrate mixture according to the rare earth ion (Re):cerium ion (Ce) ratio of x:(1-x) (0<=x<=0.5), dissolving the mixture in a high-polymer organic solvent synthetic colloid, applying the colloid onto an M2Zr2O7 substrate, drying, putting the M2Zr2O7 substrate into an atmosphere sintering furnace, and carrying out phase decomposition in the H2 / Ar reducing atmosphere. The invention adopts the full-nitrate-system chemical solution deposition method to prepare the RexCe1-xOy / M2Zr2O7 double-layer buffer layer. Compared with the physical method, the preparation method disclosed by the invention is simple and easy to implement, has the advantages of low cost and no pollution, and can implement large-scale industrial production.

Description

technical field [0001] The invention belongs to the research field of high-temperature superconducting coating conductors, and specifically relates to a chemical solution deposition method for preparing Re x Ce 1-x o y / M 2 Zr 2 o 7 The double-buffer approach. Background technique [0002] The second-generation high-temperature superconducting tape has broad application prospects in power systems due to its excellent intrinsic electromagnetic properties, especially its excellent current-carrying capacity under high magnetic fields. [0003] The composition of the high-temperature superconducting coating conductor consists of three parts, the substrate, the buffer layer, and the superconducting layer. The buffer layer material plays a significant role as both a growth template and a barrier layer. La 2 Zr 2 o 7 Due to thermal stability and good chemical matching with NiW substrate and YBCO, it has become a hot spot in the research of coated conductors. while CeO 2...

Claims

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Application Information

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IPC IPC(8): C23C20/08C04B35/48C04B35/50
Inventor 雷鸣赵勇武伟蒲明华张勇张欣
Owner SOUTHWEST JIAOTONG UNIV
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