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Spray granulation preparation method for zirconium oxide toughened aluminum oxide powder

A technology of alumina powder and spray granulation, which is applied to the preparation of spray granulation of zirconia toughened alumina powder and the preparation of zirconia toughened alumina powder, and can solve the problem of uneven microstructure and toughening of ZTA ceramics. The effect is not obvious, the two-phase dispersion is uneven, etc., to achieve the effect of high sphericity, good fluidity, and excellent molding performance

Inactive Publication Date: 2012-10-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder prepared by the mechanical mixing method is relatively thick and unevenly distributed, and the powder is likely to cause uneven microstructure of ZTA ceramics, the decline in mechanical properties, and the toughening effect is not obvious; the ZTA powder prepared by the sol-gel method is evenly distributed , but its filtration is more difficult, and the process is complicated and difficult to operate; the hydrothermal synthesis method has many advantages, but there are disadvantages such as harsh reaction conditions and uneven two-phase dispersion; Kulkov [Kulkov S. Yuan Huajun. Nanostructure ZrO2(Y) and ZrO2(Y)-Al2O3 powders before and after low temperature annealing. Jilin University Acta Natural Sciences, 2002, (1): 61-65] Utilize aqueous solution drops of metal salts in high-frequency plasma thermal hydrolysis and rapid cooling to prepare ZTA ultrafine powder, the powder has high purity and uniform composition, However, the shape of the powder is complex, such as hollow spheres, scales, etc.
[0004]The ZTA composite powders currently prepared are basically nano-scale primary particles. To prepare ZTA materials generally requires a granulation process, and polyethylene Alcohol (abbreviation: PVA) granulation, isostatic granulation and other methods of granulation have problems such as poor particle shape and uneven distribution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to 97mol% ZrO 2 +3mol%Y 2 o 3 Proportioning, weigh 74.25g ZrOCl 2 ·8H 2 O and 4.32 g YCl 3 ·6H 2 0, while adding 1 g of polyethylene glycol as a dispersant according to 0.5% of the total mass of the final product ZTA powder, three kinds of reagents are dissolved in 200 ml of distilled water, and according to the added ZrOCl 2 ·8H 2 O, YCl 3 ·6H 2 The total mass of the three chemical reagents O and polyethylene glycol was diluted with distilled water again to form a solution with a concentration of 40 g / L, stirred vigorously at 350 r / min for 2 h, and then slowly added dropwise to it with a peristaltic pump while vigorously stirring Ammonia water, until the pH of the solution = 9.0, a precipitate was formed, washed with water repeatedly, and then washed with AgNO 3 The solution was tested to the absence of Cl in the sol - Until then, centrifuge at 3500 r / min to remove excess water to obtain a mixed gel of zirconium hydroxide and yttrium hydroxide; ...

Embodiment 2

[0033] (1) According to 98mol% ZrO 2 +2mol%Y 2 o 3 Proportioning, weigh 151.26g ZrOCl 2 ·8H 2 O and 5.81 g YCl 3 ·6H 2 0, while adding 2 g of polyethylene glycol as a dispersant according to 1% of the total mass of the final product ZTA powder, three kinds of reagents are dissolved in 200 ml of distilled water, and according to the added ZrOCl 2 ·8H 2 O, YCl 3 ·6H 2 The total mass of the three chemical reagents O and polyethylene glycol was diluted with distilled water again to a solution with a concentration of 20 g / L, stirred vigorously at 400 r / min for 2 h, and then slowly added dropwise to it with a peristaltic pump while vigorously stirring Ammonia water, until the pH of the solution = 10.0, a precipitate was formed, washed with water repeatedly, and then washed with AgNO 3 The solution was tested to the absence of Cl in the sol - Up to 2500 r / min centrifugation to remove excess water to obtain a mixed gel of zirconium hydroxide and yttrium hydroxide;

[0034] ...

Embodiment 3

[0039] (1) According to 97.5mol% ZrO 2 +2.5mol%Y 2 o 3 Proportioning, weigh 24.98g ZrOCl 2 ·8H 2 O and 1.21 g YCl 3 ·6H 2 0, while adding 2 g of polyethylene glycol as a dispersant according to 1% of the total mass of the final product ZTA powder, three kinds of reagents are dissolved in 200 ml of distilled water, and according to the added ZrOCl 2 ·8H 2 O, YCl 3 ·6H 2 The total mass of the three chemical reagents O and polyethylene glycol was diluted with distilled water again to form a solution with a concentration of 50 g / L, stirred vigorously at 300 r / min for 2 h, and then slowly added dropwise to it with a peristaltic pump while vigorously stirring Ammonia water, until the pH of the solution = 9.5, a precipitate was formed, washed with water repeatedly, and then washed with AgNO 3 The solution was tested to the absence of Cl in the sol - Up to 2800 r / min centrifugation to remove excess water to obtain a mixed gel of zirconium hydroxide and yttrium hydroxide;

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Abstract

The invention discloses a spray granulation preparation method for zirconium oxide toughened aluminum oxide powder. The method comprises the following steps of: preparing nano zirconium nitrate and yttrium hydroxide mixed gel by adopting a co-precipitation method, adding nano aluminum oxide, mixing uniformly by using a wet ball milling method to form Zr(OH)4+Y(OH)3 / Al2O3 slurry, performing spray drying granulation and calcination on the slurry, and thus obtaining the zirconium oxide toughened aluminum oxide powder with fine zirconium oxide crystal, uniform distribution of the zirconium oxide crystal in the aluminum oxide, high sintering activity and good forming performance. The method for preparing the zirconium oxide toughened aluminum oxide granulated composite powder overcomes the defects of low uniformity, zirconium oxide agglomeration and the like caused by directly mixing and granulating zirconium oxide powder and aluminum oxide powder in the conventional method, powder making and granulation processes are integrated, the method is simple, and the zirconium oxide is dispersed uniformly and is low in granularity and high in sintering activity.

Description

technical field [0001] The invention belongs to the field of high-performance structural ceramic materials and powder preparation, and relates to a preparation method of zirconia toughened alumina powder, in particular to a spray granulation preparation method of zirconia toughened alumina powder. Background technique [0002] Alumina toughened zirconia (abbreviation: ZTA) material is a complex phase fine ceramic material formed by introducing a certain amount of phase change material zirconia into the alumina matrix. This complex phase fine ceramic not only exhibits the characteristics of high toughness and high strength of zirconia ceramics, but also retains the advantages of high hardness of alumina ceramics. The preparation process of ZTA nanocomposite powder has a great influence on the sintering performance, phase, microstructure, mechanical properties and friction and wear properties of ZTA composite materials. ZrO 2 grains in Al 2 o 3 The degree of uniform distr...

Claims

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Application Information

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IPC IPC(8): C04B35/119C04B35/78C04B35/626
Inventor 饶平根王红兵赵威
Owner SOUTH CHINA UNIV OF TECH
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