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Method for preparing scandium oxide stabilized zirconia powder by hydrothermal method and scandium oxide stabilized zirconia powder prepared by method

A technology for stabilizing zirconia and scandium oxide, applied in the field of solid electrolyte materials, can solve the problems of high impurity content, high raw material cost, serious agglomeration, etc., and achieve the effects of low impurity content, good sintering performance and uniform powder particle size

Pending Publication Date: 2020-05-29
CHINA ENFI ENGINEERING CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for preparing scandia-stabilized zirconia powder by hydrothermal method and the scandia-stabilized zirconia powder prepared by the method, so as to solve the problems existing in the preparation of scandia-stabilized zirconia in the prior art Problems such as high impurity content, serious agglomeration, large particle size, and high cost of raw materials

Method used

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  • Method for preparing scandium oxide stabilized zirconia powder by hydrothermal method and scandium oxide stabilized zirconia powder prepared by method
  • Method for preparing scandium oxide stabilized zirconia powder by hydrothermal method and scandium oxide stabilized zirconia powder prepared by method

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Experimental program
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Effect test

Embodiment 1

[0032] Configure the reaction solution: dissolve zirconium oxychloride in water to obtain zirconium oxychloride solution, add Sc 2 o 3Dissolve in hot hydrochloric acid to prepare scandium chloride solution, mix the above solutions, add urea (the molar ratio of cation and urea is 1:30) and mix and stir to obtain a scandium-zirconium mixed solution, wherein the cation of the scandium-zirconium mixed solution The concentration is 0.5 mol / l, and relative to the total moles of scandium ions and zirconium ions, the molar ratio of scandium ions is 10%.

[0033] Hydrothermal reaction: put the mixed solution in a polytetrafluoroethylene hydrothermal reaction kettle, the reaction temperature is 150°C, and the reaction time is 12h. After the reaction, cool to room temperature, filter, wash, and dry to obtain the scandium-zirconium precursor solid.

[0034] Calcination: calcining the prepared scandium-zirconium precursor solid at 900° C. for 5 hours to obtain the scandia-stabilized zirc...

Embodiment 2

[0036] Configure the reaction solution: dissolve zirconium oxychloride in water to obtain zirconium oxychloride solution, add Sc 2 o 3 Dissolve in hot hydrochloric acid to prepare a scandium chloride solution, mix the above solutions, add urea (the molar ratio of cation to urea is 1:50) and mix and stir to obtain a scandium-zirconium mixed solution, wherein the cation of the scandium-zirconium mixed solution The concentration is 1.5 mol / l, and relative to the total moles of scandium ions and zirconium ions, the molar ratio of scandium ions is 8%.

[0037] Hydrothermal reaction: put the mixed solution in a polytetrafluoroethylene hydrothermal reaction kettle, the reaction temperature is 100°C, and the reaction time is 36h. After the reaction, cool to room temperature, filter, wash, and dry to obtain the scandium-zirconium precursor solid.

[0038] Calcination: calcining the prepared scandium-zirconium precursor solid at 450° C. for 10 h to obtain the scandia-stabilized zircon...

Embodiment 3

[0040] Configure the reaction solution: dissolve zirconium oxychloride in water to obtain zirconium oxychloride solution, add Sc 2 o 3 Dissolve in hot hydrochloric acid to prepare a scandium chloride solution, mix the above solutions, add urea (the molar ratio of cation to urea is 1:35) and mix and stir to obtain a scandium-zirconium mixed solution, wherein the cation of the scandium-zirconium mixed solution The concentration is 0.01 mol / l, and relative to the total moles of scandium ions and zirconium ions, the molar ratio of scandium ions is 13%.

[0041] Hydrothermal reaction: put the mixed solution in a polytetrafluoroethylene hydrothermal reaction kettle, the reaction temperature is 200°C, and the reaction time is 6h. After the reaction, cool to room temperature, filter, wash, and dry to obtain the scandium-zirconium precursor solid.

[0042] Calcination: calcining the prepared scandium-zirconium precursor solid at 1200° C. for 1 hour to obtain the scandia-stabilized zi...

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Abstract

The invention provides a method for preparing scandium oxide stabilized zirconia powder by a hydrothermal method and the scandium oxide stabilized zirconia powder prepared by the method. The method comprises the following steps: S1, mixing a scandium-containing solution, a zirconium-containing solution and urea to obtain a mixed solution; S2, putting the mixed solution into a hydrothermal kettle,and carrying out hydrothermal reaction at the temperature of 100-250 DEG C to obtain a scandium-zirconium precursor solution; S3, filtering, washing and drying the scandium-zirconium precursor solution to obtain a scandium-zirconium precursor solid; and S4, calcining the scandium-zirconium precursor solid to obtain the scandium oxide stabilized zirconium oxide powder. By utilizing the method provided by the invention, the problems of high impurity content, serious agglomeration, large particle size, high raw material cost and the like during preparation of scandium oxide stabilized zirconia inthe prior art are effectively solved.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials, in particular to a method for preparing scandia-stabilized zirconia powder by a hydrothermal method and the scandia-stabilized zirconia powder prepared by the method. Background technique [0002] Solid oxide fuel cell (SOFC) is an efficient and clean energy conversion device, and the electrolyte as its key component is a hot research topic at present. Traditional yttria-stabilized zirconia (YSZ) electrolytes generally operate at high temperatures of 1000 °C or above to obtain high power conversion efficiency. Such high operating temperatures will lead to serious interface reactions and failure of battery components. Scandia-stabilized zirconia (ScSZ) is currently the electrolyte material with the highest ionic conductivity among zirconium-based solid electrolytes, and its conductivity is about twice that of YSZ at 800 °C, making it the preferred electrolyte for medium and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/626C04B2235/3224C04B2235/95C04B2235/96
Inventor 李晓艳王玮玮姚心杜尚超苏博韩国强
Owner CHINA ENFI ENGINEERING CORPORATION
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