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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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 n

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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Example Embodiment

[0025] Example 1: A chemical solution deposition method for preparing Sm 0.2 Ce 0.8 O 1.9 / La 2 Zr 2 O 7 The double-layer buffer layer method consists of the following steps in sequence:

[0026] a, La 2 Zr 2 O 7 (LZO) film preparation:

[0027] Add an 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 1:1 dissolved in ethylene glycol methyl ether, in which 1 mol (gadolinium nitrate + zirconium nitrate): 0.5-3 liter volume ratio is added with hydroxyethyl methyl ether, and 5wt.% oxidized polyethylene is added with 20000 synthetic colloid. The colloid is uniformly spin-coated on the NiW base tape, the obtained wet film is dried and the water is removed, and then put into the H 2 In the heat treatment furnace with a reduction atmosphere of Ar / Ar, the temperature is raised to 350°C at a rate of 5°C / min to fully decompose the organic matter and nitrate, and then the temperature is directly raised to the phase forming te...

Example Embodiment

[0030] Example 2: A chemical solution deposition method for preparing Gd 0.3 Ce 0.7 O 1.85 / Gd 2 Zr 2 O 7 The double-layer buffer layer method consists of the following steps in sequence:

[0031] a, Gd 2 Zr 2 O 7 (GZO) film preparation:

[0032] Add an 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 1:1 dissolved in ethylene glycol methyl ether, in which 1 mol (gadolinium nitrate + zirconium nitrate): 0.5-3 liter volume ratio is added with hydroxyethyl methyl ether, and 3wt.% oxidized polyethylene 20000 synthetic colloid is added. The colloid is coated on the NiW base tape by the pulling method, the obtained wet film is dried and the water is removed, and then put into the H 2 / Ar reduction atmosphere heat treatment furnace, first heat up to 600°C at a rate of 1°C / min to fully decompose organic matter and nitrate, and then directly heat up to 1200°C phase formation temperature, keep it for 1 hour to obtain Gd 2 ...

Example Embodiment

[0035] In Example 1 and Example 2, the rare earth Sm and rare earth Gd were used for implementation, in which the 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 implementation case 0.2 Ce 0.8 O 1.9 / La 2 Zr 2 O 7 / The X-ray diffraction pattern of the NiW buffer layer, as can be seen from the figure, all the double-layer buffer layers prepared have a good biaxial texture; Figure 2 Sm prepared by the implementation case 0.2 Ce 0.8 O 1.9 / La 2 Zr 2 O 7 / SEM picture of NiW double-layer buffer layer, it can be seen from the figure that the surface of the buffer layer is flat and compact, 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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