Cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder and preparation method thereof

A nano-ceramic powder and co-doping technology, which is applied in the field of cerium-calcium double-element co-doped lanthanum zirconate nano-ceramic powder and its preparation, can solve the problems of reducing thermal conductivity and achieve simple equipment and excellent anti-sintering performance , The effect that the preparation process is easy to control

Active Publication Date: 2017-09-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
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Problems solved by technology

The results of the study showed that CeO 2 The incorporation significantly reduces the La 2 Zr 2 o 7 thermal conductivity, while the range of thermal conductivity changes with temperature is relatively gentle

Method used

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  • Cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder and preparation method thereof
  • Cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder and preparation method thereof
  • Cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder and preparation method thereof

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preparation example Construction

[0034] Please refer to figure 1 , an embodiment of the present invention provides a method for preparing a cerium-calcium double-element co-doped lanthanum zirconate nano-ceramic powder, comprising the following steps:

[0035] S1, mixing cerium salt, calcium salt, zirconium salt and lanthanum salt with a concentration of 0.1-1mol / L to prepare a mixed solution, adding the mixed solution to the precipitant by reverse titration, stirring and standing for aging, A hydroxide colloid is obtained.

[0036] In step S1, the cerium salt is ceric sulfate or cerium nitrate, the calcium salt is calcium nitrate, calcium chloride or calcium sulfate, the zirconium salt is zirconium oxychloride, and the lanthanum salt is lanthanum nitrate or lanthanum chloride. In the mixed solution, calcium ions, The molar ratio of cerium ion, zirconium ion and lanthanum ion is 1:7:14:18~2:5:7:6, the precipitation agent is ammonia water or ammonium oxalate, the volume concentration of ammonia water is 25%~1...

Embodiment 1

[0049] Mix cerium nitrate solution with a concentration of 0.2mol / L, zirconium oxychloride solution with a concentration of 0.356mol / L, calcium nitrate solution with a concentration of 0.5mol / L and lanthanum nitrate solution with a concentration of 0.5mol / L to prepare calcium The molar ratio of ions, cerium ions, zirconium ions and lanthanum ions is a mixed solution of 1:7:14:18, and the mixed solution is added to ammonia water with a volume concentration of 40% by reverse titration, and stirred into the ammonia water reaction system The pH value of the solution reaches 10, and it is left to age for 12 hours to obtain the hydroxide colloid; the hydroxide colloid is separated and washed by inorganic ceramic membrane separation technology to obtain a precipitate and a solution, and the pH value of the solution is measured. If the pH value of the solution is greater than 7 , then continue to separate until the pH value of the solution is 7 and the solution reacts with silver nitra...

Embodiment 2

[0052] Mix cerium nitrate solution with a concentration of 0.15mol / L, zirconium oxychloride solution with a concentration of 0.45mol / L, calcium nitrate solution with a concentration of 0.6mol / L and lanthanum nitrate solution with a concentration of 0.65mol / L to prepare calcium The molar ratio of ions, cerium ions, zirconium ions and lanthanum ions is a mixed solution of 1:4:7:8, and the mixed solution is added to ammonia water with a volume concentration of 30% by reverse titration, and stirred into the ammonia water reaction system The pH value of the solution reaches 11, and it is left to age for 11 hours to obtain the hydroxide colloid; the hydroxide colloid is separated and washed by inorganic ceramic membrane separation technology to obtain a precipitate and a solution, and the pH value of the solution is measured. If the pH value of the solution is greater than 7 , then continue to separate until the pH value of the solution is 7 and the solution does not react with silve...

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Abstract

The invention provides cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder and a preparation method thereof. The preparation method includes following steps: preparing a mixed solution, and mixing the same with a precipitant to obtain hydroxide colloid; separating and 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 to obtain a mixture; distilling the mixture, and drying to obtain solid powder; calcining the solid powder to obtain the cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder. The structural formula of the cerium-calcium bi-element co-doped lanthanum zirconate nano ceramic powder is (La1-2xCexCax)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 easy to control.

Description

technical field [0001] The invention relates to the field of preparation and application of inorganic non-metallic materials, in particular to a cerium-calcium double-element co-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, and is an important candidate material for high-temperature thermal barrier coating materials. At the same time, although the lanthanum zirconate material has excellent thermodynamic properties, its thermal expansion coefficient is small (about 9.7×10 -6 K -1 ), so when it is used as a thermal barrier coating m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626C04B35/624
CPCC04B35/48C04B35/624C04B35/626C04B35/62655C04B35/62675C04B2235/3208C04B2235/3227C04B2235/3229C04B2235/9607
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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