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Preparation method of nano-silver doped cerium oxide coating

A cerium oxide and nano-silver technology, applied in coating, metal material coating process, solid-state chemical plating, etc., can solve the problem of grain growth of NiW metal substrate, increase of surface roughness of cerium oxide, and no stress release. Center and other problems, to achieve the effect of smooth and flat surface, promoting uniform stress release and reducing influence

Active Publication Date: 2014-01-08
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, these methods generally require heat treatment of the oxide coating at a relatively high temperature (1000°C to 1200°C). A discontinuous area appears at the boundary, and the surface roughness of cerium oxide increases
At the same time, doping in these cases, there are no nano-dots in the cured film of cerium oxide, and there is no effective stress release center in the process of decomposition and phase formation of the cured film, which is not conducive to the stress release of thick films.

Method used

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  • Preparation method of nano-silver doped cerium oxide coating
  • Preparation method of nano-silver doped cerium oxide coating
  • Preparation method of nano-silver doped cerium oxide coating

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Step 1, dissolving cerium acetylacetonate (or cerium propionate) in propionic acid, then adding nano-silver particles with a size of 5nm to prepare a precursor solution with a cerium ion concentration of 0.2mol / L; the nano-silver particles in the precursor solution The molar weight is 0.5% of the molar weight of cerium ions;

[0030] Step 2. Apply the precursor liquid described in step 1 on the NiW / La by spin coating at a speed of 4000rpm 2 Zr 2 o 7 On the substrate, the coating time is 30s, and then placed in a tube furnace, in a mixed atmosphere of argon and hydrogen, the temperature in the furnace is raised to 950°C at a heating rate of 100°C / min, and kept for 0.5h, then The furnace was cooled to obtain a nano-silver doped cerium oxide coating; the volume percentage of hydrogen in the mixed atmosphere was 8%.

[0031] figure 1 It is the x-diffraction θ-2θ scanning figure of the nano-silver-doped cerium oxide coating prepared in this embodiment, as can be seen fro...

Embodiment 2

[0034] This embodiment is the same as Embodiment 1, except that the substrate is a NiW substrate.

[0035]The 0.5% Ag-doped cerium oxide coating prepared in this example has a sharp biaxial texture, and the surface is smooth without microcracks and holes, which can avoid the damage of the coating by thermal erosion grooves, and the surface roughness is 3nm ; Doped nano-silver particles effectively improve the texture orientation and surface quality of cerium oxide coating. The YBCO superconducting layer prepared on the cerium oxide layer doped with nano-silver particles exhibits excellent superconducting properties, and the critical current density of the superconducting layer is obviously improved.

Embodiment 3

[0037] Step 1. Dissolve cerium propionate (or cerium acetylacetonate) in propionic acid, and then add nano-silver particles with a size of 20nm to prepare a precursor solution with a cerium ion concentration of 0.5mol / L; the nano-silver particles in the precursor solution The molar mass is 0.05% of the molar mass of cerium ions;

[0038] Step 2. Use the spin coating method to coat the precursor solution described in step 1 on the NiW / La at a speed of 2000rpm 2 Zr 2 o 7 On the substrate, the coating time is 90s, and then placed in a tube furnace, in a mixed atmosphere of argon and hydrogen, the temperature in the furnace is raised to 900°C at a heating rate of 50°C / min, and kept for 0.7h. The furnace is cooled to obtain a nano-silver doped cerium oxide coating; the volume percentage of hydrogen in the mixed atmosphere is 4%.

[0039] Figure 5 The scanning electron microscope (SEM) image of the surface morphology of the nano-silver doped cerium oxide coating prepared for th...

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Abstract

The invention discloses a preparation method of a nano-silver doped cerium oxide coating. The preparation method comprises the following steps: 1, dissolving organic cerium salt into propionic acid, adding nano-silver particles and preparing a precursor liquid; and 2, coating the precursor liquid on a substrate by a spin-coating method, placing the substrate into a tubular furnace, heating the furnace to be 850 to 950 DEG C under reducing atmosphere, preserving heat for 0.5 to 1 hour, and cooling along with the furnace to obtain the nano-silver doped cerium oxide coating. According to the preparation method of the nano-silver doped cerium oxide coating, the nano-silver particles are introduced into the precursor liquid, and the dispersed nano-silver particles can form an effective stress release center in the cerium oxide coating, so that uniform stress release of the cerium oxide coating in a phase thinning process is promoted, cracks and holes are avoided, and the surface roughness of a cerium oxide film is reduced. The cerium oxide coating prepared by the method has a sharp biaxial textured structure, a smooth and flat surface and no cracks, and is favorable for epitaxial growth of a superconducting layer.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting materials, and in particular relates to a preparation method of a nano silver-doped cerium oxide coating. Background technique [0002] YBCO coated conductor is a multi-layer composite material composed of metal substrate / buffer layer / superconducting layer / protective layer. Due to the large lattice mismatch (about 8%) and severe atomic diffusion between the superconducting layer and the metal base band, a buffer layer must be deposited between the two to achieve the effect of transferring texture and blocking diffusion. Realize the texture growth of the YBCO superconducting layer and obtain high current-carrying capacity at the same time. Cerium oxide (CeO 2 ) is considered to be an extremely important buffer layer material due to its high thermal stability, small lattice mismatch with YBCO, and good chemical compatibility. [0003] CeO 2 Belonging to the cubic fluorit...

Claims

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Application Information

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IPC IPC(8): C23C24/08C23C20/08
Inventor 金利华冯建情白利锋王耀于泽铭李成山张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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