Ytterbium/gadolinium/yttrium ternary co-doped zirconium oxide nanostructure agglomerated sphere and production method thereof

A nanostructure and production method technology, applied in the field of ceramic materials, can solve problems affecting the stability and life of high-temperature service, and achieve the effects of easy control of process parameters, uniform particle size distribution, and high thermal expansion coefficient

Active Publication Date: 2021-05-28
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, YSZ will undergo phase transformation and sintering above 1200°C, which will greatly affect its high-temperature service stability and life.

Method used

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  • Ytterbium/gadolinium/yttrium ternary co-doped zirconium oxide nanostructure agglomerated sphere and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Such as figure 1As shown, yttrium nitrate, ytterbium nitrate and gadolinium nitrate were dissolved in deionized water to prepare a 0.2mol / L nitrate solution, and zirconium oxychloride was dissolved in deionized water to prepare a 0.5mol / L solution. The solutions were mixed in proportion to obtain a mixed solution with a molar ratio of yttrium ion:ytterbium ion:gadolinium ion:zirconium ion=20:10:10:60. The mixed solution was dropped dropwise into the ammonium oxalate solution to form a precipitate. Hydroxide precipitates were obtained after stirring and aging, wherein the stirring time was 2 hours, and the precipitation aging time was 12 hours. The precipitate is subjected to cross-flow washing treatment to remove impurity ions. Mix the washed hydroxide precipitate with n-butanol at a mass ratio of 1:3 and stir evenly, and place it in a dry distillation device at 150°C for azeotropic distillation, dehydration and drying. Then the powder was calcined in a high-temperat...

Embodiment 2

[0043] Mix 0.1mol / L yttrium nitrate, ytterbium nitrate and zirconium nitrate solution with 0.5mol / L zirconium oxychloride solution in proportion to obtain the molar ratio of yttrium ion:ytterbium ion:gadolinium ion:zirconium ion=2:2:1 : 95 mixed solution. The mixed solution was dropped dropwise into ammonia water with a volume concentration of 50% to form a precipitate. The pH value of the solution was kept at 9. After stirring for 2 hours, the solution was left to age for 24 hours. Subsequently, the obtained hydroxide colloid was subjected to repeated cross-flow washing until the pH value of the solution was 7 and there was no chloride ion in the solution (no precipitation after adding silver nitrate). Mix the washed hydroxide precipitate with isopropanol at a mass ratio of 1:2 and stir evenly, and place it in a dry distillation device at 200°C for azeotropic distillation dehydration and drying treatment. Then the powder was calcined in a high-temperature furnace at 1100° C....

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Abstract

The invention discloses an ytterbium/gadolinium/yttrium ternary co-doped zirconium oxide nanostructure agglomerated sphere and a production method thereof. The preparation method comprises the following steps: uniformly stirring ytterbium salt, gadolinium salt, yttrium salt and zirconium oxychloride to obtain a mixed solution; gradually adding a precipitator into the mixed solution, and conducting standing and aging to obtain hydroxide colloid; performing cross flow washing; carrying out azeotropic distillation: conducting mixing with a dispersing agent, and carrying out distillation and carbonization treatment to obtain powder; performing high-temperature calcination to obtain tetragonal-phase nano powder; carrying out jet milling treatment on the tetragonal-phase nano powder; using the colloid to prepare micron-sized agglomerated spheres by adopting a spray drying technology; performing screening; removing moisture in the balls; and carrying out plasma secondary spheroidizing to obtain the sphere with the size range meeting the requirement. According to the preparation method, the powder with relatively good dispersity is obtained by combining a coprecipitation method with membrane separation, azeotropic distillation and jet milling crushing technologies, and the nano powder is made into nano-structure agglomerated balls, so that a foundation is laid for preparation of a high-performance nano ceramic thermal barrier coating.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a ytterbium / gadolinium / yttrium ternary co-doped zirconia nanostructure agglomerated sphere and a production method thereof. Background technique [0002] 6-8wt.% Yttria Stabilized Zirconia (YSZ) is currently the most widely used and researched ceramic layer material for thermal barrier coatings. With the development of aero-engines towards high efficiency and high thrust-to-weight ratio, the temperature at the turbine inlet has increased significantly. This puts forward higher service temperature requirements for the ceramic material of its surface layer. However, YSZ will undergo phase transformation and sintering above 1200 °C, which greatly affects its high-temperature service stability and life. In order to further increase the service temperature of thermal barrier coatings, the current domestic and international research hotspots mainly include: (1) the research...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/48
CPCC04B35/62695C04B35/48C04B2235/3224C04B2235/3225C04B2235/5436
Inventor 罗丽荣靳洪允周明侯书恩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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