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Preparation method of ziroconium oxide composite nano crystal material

A technology of nano-crystals and composites, applied in the direction of zirconia, etc., can solve the problems of nano-grain loss of nano-quality, low binding force, unbalanced growth of co-precipitated composite grains, etc.

Active Publication Date: 2006-09-13
天津海赛纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method is suitable for large-scale production and low cost, it is widely used, but it also has problems such as difficult control of nucleation and crystallization, uneven growth of co-precipitated composite grains, and different particle sizes of powders.
The surface treatment method is to add organic surface treatment agents such as organic solvents, surfactants, polymers, etc. to the prepared zirconia nano-slurry or powder, but some of these substances have a weaker binding force with the zirconia composite. Low, some substances will be hydrolyzed and decomposed under certain conditions, and some substances will decompose and burn out due to the influence of temperature and other factors, so that the nanocrystalline grains will form secondary aggregation and lose the nano quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Hydrolysis nucleation:

[0021] Dissolve 353.3 g of zirconium oxychloride in deionized water to make Zr 4+ The concentration reaches 1.8%. Add 29.6 grams of anhydrous sodium sulfate to the aqueous solution at room temperature to make the SO in the aqueous solution 4 2- and Zr 4+ The weight ratio reaches 0.2, and then 5% sodium carbonate solution is added to adjust the pH value of the above solution to 3 to form nano-scale hydrated zirconia colloid. Place the hydrated zirconia colloid at room temperature for 48 hours to age, then adjust its pH value to 6 with 5% sodium carbonate solution, so that the colloid can be coagulated into a colloid coagulate that is easy to filter, and then filter-washed The method uses ammonia solution with a pH value of 8 as a washing solution to remove impurities in the colloidal aggregate and make a filter cake, and finally add Zr by weight to the filter cake. 4- 12 times the weight of deionized water to obtain nano-scale hydrated z...

Embodiment 2

[0030] (1) Hydrolysis nucleation:

[0031] Dissolve 353.3 g of zirconium oxychloride in deionized water to make Zr 4+ The concentration reaches 2.1%. Add 52.6 grams of anhydrous potassium sulfate to the aqueous solution at a temperature of 50°C to make the SO in the aqueous solution 4 2- and Zr 4+ The weight ratio reaches 0.29, and then 15% potassium carbonate solution is added to adjust the pH value of the above solution to 5 to form nano-sized hydrated zirconia colloid. Place the hydrated zirconia colloid at room temperature for 36 hours to age, then adjust its pH value to 6 with 15% potassium carbonate solution, so that the colloid can be condensed into a colloid coagulate that is easy to filter, and then filter-washed The method uses ammonia solution with a pH value of 9 as a washing solution to remove impurities in the colloidal condensate and make a filter cake, and finally add a weight of Zr to the filter cake. 4+ 10 times the weight of deionized water to obtain na...

Embodiment 3

[0040] (1) Hydrolysis nucleation:

[0041] Dissolve 353.3 g of zirconium oxychloride in deionized water to make Zr 4+ The concentration reaches 2.4%. Add 38.2 grams of 98% sulfuric acid to the aqueous solution at a temperature of 60°C to make the SO in the aqueous solution 4 2- and Zr 4+ The weight ratio reaches 0.39, and then 20% ammonia solution is added to adjust the pH value of the above solution to 2 to form nano-scale hydrated zirconia colloid. Place the hydrated zirconia colloid at room temperature for 24 hours to age, then adjust its pH value to 8 with 20% ammonia solution, so that the colloid can condense into a colloid aggregate that is easy to filter, and then adopt the method of filtering-washing Use the ammonia solution with a pH value of 10 as the washing liquid to remove the impurities in the colloidal condensate and make a filter cake, and finally add Zr by weight to the filter cake. 4+ 13 times the weight of deionized water to obtain nano-scale hydrated z...

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Abstract

A nanocrystal of zirconium-lanthanum oxide or RE oxide composition is prepared through hydrolyzing to become core, compounding by codeposition, coupling, calcining and pulverizing to obtain a sosoloid. It has high crystal-phase stability and thermal stability, and can be used as the catalyst of the tail gas of car.

Description

technical field [0001] The invention relates to a preparation method of a nanometer material, in particular to a preparation method of a zirconia composite nanocrystal material. Background technique [0002] Nanotechnology is one of the high-tech fields today. Under the nano-scale micro-space structure, the physical and chemical properties of matter have undergone wonderful changes. Zirconia composite nanocrystal is such a widely used nanomaterial with special properties, which can be used in the fields of catalyst carrier or catalyst, high-temperature high-strength dense ceramics, sensor and optoelectronic material manufacturing. At present, the preparation methods of zirconia nanocrystals usually include hydrolysis method, co-precipitation method, hydrothermal method, spray pyrolysis method, plasma method and gas phase hydrolysis method, etc., and also include the dispersion of nano-slurry or powder to prevent Secondary coagulation surface treatment method. The hydrolys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C04B35/482
Inventor 胡泽华
Owner 天津海赛纳米材料有限公司
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