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Cerium-doped lanthanum zirconate nano powder and preparation method thereof

A technology of nano-powder and lanthanum zirconate, which is applied in the direction of nano-technology, can solve problems such as unfavorable industrial production, hard agglomerates of powder, and affecting material properties, so as to facilitate large-scale industrial production, prevent agglomeration and growth, evenly distributed effect

Inactive Publication Date: 2012-10-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is relatively simple and easy, but the calcination temperature of this method is high, and the particle size of the powder is large, and the particle size distribution is uneven, which seriously affects the performance of the material.
Co-precipitation is a common liquid phase method. Generally, a precipitant is added to the complex rare earth solution to obtain hydroxide precipitation, and then filtered, washed, dehydrated, dried, and calcined to obtain zirconate powder. This method It is easy to implement and can produce multi-component nanopowder with small particle size and easy control of components, but the disadvantage is that the prepared powder often has more hard aggregates
The powder prepared by this method has a smaller particle size and a more uniform distribution, but the process is relatively complicated, which is not conducive to industrial production

Method used

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  • Cerium-doped lanthanum zirconate nano powder and preparation method thereof
  • Cerium-doped lanthanum zirconate nano powder and preparation method thereof
  • Cerium-doped lanthanum zirconate nano powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] 1) Preparation of hydroxide colloid:

[0037]Zirconium oxychloride solution and cerium nitrate solution are mixed, and preparation obtains the mixed solution of zirconium oxychloride solution and cerium nitrate solution; Then mixed solution and lanthanum nitrate solution are mixed, and the mol ratio that obtains cerium ion, zirconium ion and lanthanum ion is 1: 19:20, the concentration of cerium ion is 0.012mol / L, the concentration of zirconium ion is 0.228mol / L, the mixed solution of lanthanum ion concentration is 0.24mol / L;

[0038] Add ammonia water with a volume concentration of 30%~70% and stir to make the pH value of the system reach 8-10; then stand and age for more than 12 hours to obtain hydroxide colloid;

[0039] 2) Solid-liquid separation and washing: Pour off the hydroxide supernatant, separate and wash the hydroxide colloid through an inorganic ceramic membrane to remove impurities, until the separated water cannot detect chloride ions with silver nitrate ...

Embodiment 2

[0047] 1) Preparation of hydroxide colloid:

[0048] Prepare a mixed solution of cerium nitrate, zirconium oxychloride and lanthanum chloride, wherein the molar ratio of cerium ion, zirconium ion and lanthanum ion is 1:9:10, the concentration of cerium ion is 0.05mol / L, and the concentration of zirconium ion is 0.45 mol / L, the concentration of lanthanum ion is 0.5mol / L;

[0049] Add ammonia water with a volume concentration of 35% and stir to make the pH value of the system reach 8; then stand and age for more than 12 hours to obtain a hydroxide colloid;

[0050] 2) Solid-liquid separation and washing: Pour off the hydroxide supernatant, remove the impurities from the hydroxide colloid by centrifugation, and wash until no chloride ions are found in the washing solution with silver nitrate, and use a centrifuge to concentrate to obtain Semi-solid high-viscosity hydroxide gel with a solid content of 8%~20%;

[0051] 3) Dehydration: Mix the semi-solid high-viscosity hydroxide g...

Embodiment 3

[0057] 1) Preparation of hydroxide colloid: prepare a mixed solution of zirconium oxychloride, ceric sulfate, and lanthanum chloride, wherein the molar ratio of cerium ions, zirconium ions, and lanthanum ions in the mixed solution is 1:3:4, and the concentration of cerium ions is 0.175mol / L, the concentration of zirconium ions is 0.525 mol / L, and the concentration of lanthanum ions is 0.7 mol / L; add ammoniacal liquor with a volume concentration of 70% to the mixed solution and stir to make the pH value of the system reach 10; then Static aging makes hydroxide colloid;

[0058] 2) Solid-liquid separation and washing: Pour off the hydroxide supernatant, remove impurities from the hydroxide colloid by centrifugation and wash until no chloride ions are found in the washing solution with silver nitrate, and filter with a filter press Concentrate to obtain a semi-solid high-viscosity hydroxide gel;

[0059] 3) Dehydration: mix the semi-solid high-viscosity hydroxide gel with n-prop...

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Abstract

The invention relates to cerium-doped lanthanum zirconate nano powder and a preparation method thereof. The cerium-doped lanthanum zirconate nano powder is characterized in that the cerium-doped lanthanum zirconate nano powder is of a single-phase pyrochlore structure, has the particle size of 30 to 250nm, is uniformly distributed, is of a sphere shape, is prepared by carrying out doping on the Zr position by Ce and has the chemical formula of La2Zr2-xCexO7, wherein x is less than or equal to 0.5 and more than or equal to 0.1. The cerium-doped lanthanum zirconate nano powder is of the single-phase pyrochlore structure, has excellent anti-sintering performance, has small particle size, is uniformly distributed, has regular morphology and has stable structure at high temperature; the thermal expansion coefficient of the powder from the room temperature to the temperature of 1,400 DEG C can reach 12*10<-6<K<-1>; and the cerium-doped lanthanum zirconate nano powder has the thermal conductivity of lower than 1.5W.m<-1>.K<-1>, is particularly suitable for preparation of various high temperature resistance thermal barrier coating or high temperature resistance abrasion-resistant anticorrosion coating materials, and is applied to the industries of aerospace, gas turbines, ships, vehicles, machinery, chemical industry and the like.

Description

technical field [0001] The invention relates to a cerium-doped lanthanum zirconate nanopowder and a preparation method thereof, belonging to the field of preparation and application of inorganic non-metallic materials. 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 high melting point, low thermal conductivity, large thermal expansion coefficient, good chemical stability, and no phase change at high temperature, so it is an important candidate material for high-temperature thermal barrier coating materials. At the same time, the material also has high radiation stability and can be used as a curing medium material in the process of nuclear waste treatment. In addition, the lattice of the material contains a large number of oxygen vacancies and has cationic conductivity, which can...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/626B82Y40/00C04B35/632C04B35/638
Inventor 侯书恩张锦化靳洪允吴红丹
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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