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A kind of cerium double-doped lanthanum zirconate nano-ceramic powder and its preparation method

The technology of nano-ceramic powder and lanthanum zirconate is applied in the field of cerium double-doped lanthanum zirconate nano-ceramic powder and its preparation, which can solve the problems of easy agglomeration and large particle size of the final product, so as to reduce thermal stress and improve usage. The effect of less life and less process flow

Active Publication Date: 2020-06-26
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the precipitated product is prone to agglomeration during the process of washing, filtering and drying, resulting in a larger particle size of the final product

Method used

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  • A kind of cerium double-doped lanthanum zirconate nano-ceramic powder and its preparation method
  • A kind of cerium double-doped lanthanum zirconate nano-ceramic powder and its preparation method
  • A kind of cerium double-doped lanthanum zirconate nano-ceramic powder and its preparation method

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preparation example Construction

[0033] refer to figure 1, the invention provides a preparation method of cerium double-doped lanthanum zirconate nano-ceramic powder, comprising the following steps:

[0034] S1, mix cerium salt, zirconium salt and lanthanum salt with a concentration of 0.1-1mol / L to prepare a mixed solution, add the mixed solution to the precipitant by reverse titration method, stir and let it stand for aging to obtain object colloid.

[0035] In step S1, the cerium salt is ceric sulfate or cerium nitrate, the zirconium salt is zirconium oxychloride, and the lanthanum salt is lanthanum nitrate or lanthanum chloride, and the molar ratio of cerium ion, zirconium ion and lanthanum ion in the mixed solution is 3:7: 10~5:7:8, the precipitation agent is ammonia water or ammonium oxalate, the volume concentration of ammonia water is 20%~100%, the stirring time is 1~5h, and the pH value of the reaction system in the precipitation agent is kept at 10~14 , the standing aging time is 8-14 hours.

[0...

Embodiment 1

[0046] Mix the cerium nitrate solution with a concentration of 0.2mol / L, the zirconium oxychloride solution with a concentration of 0.356mol / L and the lanthanum nitrate solution with a concentration of 0.5mol / L, and prepare the molar ratio of cerium ions, zirconium ions and lanthanum ions as For the mixed solution of 7:14:19, use the reverse titration method to add the mixed solution to ammonia water with a volume concentration of 40%, stir until the pH value of the reaction system in the ammonia water reaches 10, and leave it to age for 12 hours to obtain the hydroxide Colloid: Put the hydroxide colloid in a centrifuge and centrifuge and wash for 5 minutes to obtain a precipitate and a solution. Measure the pH value of the solution. If the pH value of the solution is greater than 7, continue to centrifuge until the pH value of the solution is 7 and the solution is mixed with nitric acid. The silver reaction does not produce flocs; the precipitate obtained after centrifugation ...

Embodiment 2

[0049] Mix the cerium nitrate solution with a concentration of 0.15mol / L, the zirconium oxychloride solution with a concentration of 0.45mol / L and the lanthanum nitrate solution with a concentration of 0.75mol / L, and prepare the molar ratio of cerium ions, zirconium ions and lanthanum ions as For a mixed solution of 4:7:9, use the reverse titration method to add the mixed solution to ammonia water with a volume concentration of 30%, stir until the pH value of the reaction system in the ammonia water reaches 10, and leave it to age for 11 hours to obtain the hydroxide Colloid: Put the hydroxide colloid in a centrifuge and wash it for 10 minutes to obtain a precipitate and a solution. Measure the pH value of the solution. If the pH value of the solution is greater than 7, continue to centrifuge until the pH value of the solution is 7 and the solution is mixed with nitric acid. The silver reaction does not produce flocs; filter the precipitate obtained after centrifugation to obta...

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Abstract

The invention provides cerium double-doped lanthanum zirconate nano ceramic powder and a preparation method thereof. The preparation method includes following steps: preparing a mixed solution of cerium salt, zirconium salt and lanthanum salt, and mixing the same with a precipitant to obtain hydroxide colloid; centrifugally washing the hydroxide colloid to obtain precipitate; press-filtering the precipitate to obtain semi-solid-state hydroxide gel; well mixing the semi-solid-state hydroxide gel with a dispersant, and drying to obtain a solid product; calcining the solid product to obtain the cerium double-doped lanthanum zirconate nano ceramic powder. The structural formula of the nano ceramic powder is (La1-xCex)2(Zr0.7Ce0.3)2O7, wherein x is greater than or equal to 0.05 and smaller than or equal to 0.2. The preparation method is few in process, and the nano ceramic powder obtained by utilizing the preparation method has high thermal expansion coefficient.

Description

technical field [0001] The invention relates to the field of preparation and application of inorganic non-metallic materials, in particular to a cerium double-doped lanthanum zirconate nano-ceramic powder and a preparation method thereof. Background technique [0002] Lanthanum zirconate material has a unique crystal structure, good chemical stability and low thermal conductivity, and is an important structural and functional ceramic. Cerium-doped lanthanum zirconate material has the characteristics of high melting point, low thermal conductivity, large thermal expansion coefficient, good chemical stability and no phase change at high temperature. It is an important candidate material for high-temperature thermal barrier coating materials. At the same time, the material also has With high radiation stability, it can be used as solidification medium material in the process of nuclear waste treatment. In addition, the material lattice contains a large number of oxygen vacanci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622
CPCC04B35/48C04B35/622C04B2235/3227C04B2235/3229C04B2235/9607
Inventor 靳洪允何福俭侯书恩徐春辉陈勇
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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