Nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying and preparation method thereof

A nano-structure, spherical powder technology, applied in the field of lanthanum zirconate materials, can solve the problems of low strength, high powder bulk density, poor flow performance, etc., and achieve good high temperature stability, large linear thermal expansion coefficient, and good fluidity. Effect

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

AI Technical Summary

Problems solved by technology

Because it is prepared by first preparing nano-powder and then granulating, the spherical powder thus

Method used

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  • Nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying and preparation method thereof
  • Nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying and preparation method thereof
  • Nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Preparation of hydroxide colloid:

[0036] 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 0.024mol / L, and the concentration of zirconium ion is 0.216 mol / L, the concentration of lanthanum ion is 0.24mol / L;

[0037] 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;

[0038] 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 (no precipitation in the test), And use a filter press to concentrate and filter to obtain a semi-solid high-viscosity hydroxide gel with a solid content of 8% to...

Embodiment 2

[0047] 1) Preparation of hydroxide colloid:

[0048] 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 cerium ion concentration is 0.018mol / L, the zirconium ion concentration is 0.333mol / L, the mixed solution that the lanthanum ion concentration is 0.351mol / L;

[0049] Add ammonia water with a volume concentration of 35% (V / V) and stir to make the pH 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 t...

Embodiment 3

[0058] 1) Preparation of hydroxide colloid: prepare a mixed solution of zirconium oxychloride, cerium nitrate and lanthanum chloride, wherein the molar ratio of cerium ions, zirconium ions and lanthanum ions in the mixed solution is 1:7:8, and the concentration of cerium ions is 0.125mol / L, the concentration of zirconium ions is 0.875mol / L, and the concentration of lanthanum ions is 1.0 mol / L;

[0059] Add ammonia water with a volume concentration of 70% (V / V) to the mixed solution and stir to make the pH of the system reach 10; then stand and age to obtain hydroxide colloid;

[0060] 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;

[0061] 3) Acidification and dispersion of hydroxide gel: add acidifying ag...

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Abstract

The invention relates to a nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying and a preparation method thereof. The nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying is characterized in that the nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying is uniform spherical powder, the grain size of the spherical powder is 20Mu m to 90Mu m, nanostructured cerium-doped lanthanum zirconate grains are agglomerated to form the nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying, wherein the nanostructured cerium-doped lanthanum zirconate grains are of a single-phase pyrochlore structure, the grain size is 30nm to 250nm, grain size distribution is uniform and controllable, the nanostructured cerium-doped lanthanum zirconate grains are spherical, and are obtained by doping the Zr site with Ce, the chemical formula is La2Zr2-xCexO7, wherein x is greater than or equal to 0.1 and less than or equal to 0.5. Since the nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying is uniform spherical powder, the flowability is good, the thermal conductivity is low, the linear thermal expansion coefficient is great, the high-temperature stability is good, and the nanostructured cerium-doped lanthanum zirconate spherical powder for thermal spraying is particularly suitable for the preparation of various high temperature-resistant thermal barrier coatings or high temperature-resistant wear-resistant, corrosion-resistant coatings by plasma spraying, flame spraying, electric arc spraying and other thermal spraying processes.

Description

technical field [0001] The invention relates to a lanthanum zirconate material, in particular to a nanostructure cerium-doped lanthanum zirconate spherical powder for thermal spraying and a preparation method thereof. The powder material is suitable for thermal spraying (plasma spraying or flame spraying) and other processes to prepare thermal barrier coatings or high-temperature sintering processes to prepare structural ceramics. Background technique [0002] In order to improve the thrust of the aero-engine and the thermal efficiency of the fuel, the combustion temperature of the fuel must be increased. Correspondingly, the heat-resistant temperature of the hot-end parts of the engine also needs to be increased. On the basis of existing superalloy materials and cooling technology, the use of thermal barrier coating materials can effectively protect engine blades, reduce blade temperature, and improve engine efficiency. [0003] At present, the relatively mature thermal ba...

Claims

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Application Information

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IPC IPC(8): C23C4/10C04B35/48
CPCY02T50/60
Inventor 侯书恩张锦化靳洪允吴红丹
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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