Preparation method of nanometer yttrium stabilized zirconia powder

A technology of yttrium-stabilized zirconia and zirconium oxychloride, which is applied in the field of ceramics, can solve the problems affecting the toughness and strength of zirconia ceramics, low shrinkage rate of zirconia powder, and difficult to meet the application of ceramics, so as to prevent agglomeration and sintering shrinkage The effect of high rate and small particle size

Active Publication Date: 2018-01-26
汉中市恒宝锆业科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the powder produced by the above method has met most of the market demand, there are still disadvantages such as low powder shrinkage, more pores in the sintered ceramics, low density, and uneven particle shape, which affects the The toughness and strength of zirconia ceramics are difficult to meet the application of ceramics in extreme working environments such as high temperature, high pressure, and vacuum.
Chinese patent (CN102311264 A) discloses an environmentally friendly and energy-saving nano-zirconia preparation method, which uses carboxymethyl cellulose to generate colloids to solve the problem that the generated sediment is not easy to agglomerate. The production wastewater can be directly discharged, and the production method is environmentally friendly and energy-saving. , the particle size of the obtained zirconia powder can reach between 50-80 nanometers, but the zirconia powder prepared by this method still has the defects of low shrinkage and poor strength, which limits its application

Method used

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  • Preparation method of nanometer yttrium stabilized zirconia powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of nano-yttrium stabilized zirconia powder, comprising the following steps:

[0025] (1) Mix zirconium oxychloride, yttrium oxide, and deionized water at a mass ratio of 50:0.8:12, heat to 90°C, and keep warm for 3 hours to obtain a mixed solution;

[0026] (2) Add gum arabic of 10% by mass of the mixed solution obtained in step (1) to the mixed solution obtained in step (1), and then add ethylenediaminetetraacetic acid of 0.1% by mass of the mixed solution obtained in step (1), and stir for 3 hours, Generate a colloidal solution;

[0027] (3) Add an ammonia solution with a mass concentration of 0.5% to the colloidal solution formed in step (2) and stir at the same time, stir for 8 hours until PH=10.0-11.0, a white precipitate is formed, and then stand and age for 24 hours;

[0028] (4) The white precipitate was washed with deionized water, filtered, and then spray-dried at 85°C, the drying temperature was 80°C, and then jet-pulverized to obtain th...

Embodiment 2

[0032] A preparation method of nano-yttrium stabilized zirconia powder, comprising the following steps:

[0033] (1) Mix zirconium oxychloride, yttrium oxide, and deionized water in a mass ratio of 60:1:11, heat to 110°C, and keep warm for 1 hour to obtain a mixed solution;

[0034] (2) Add gum arabic of 5% mass of the mixed solution obtained in step (1) to the mixed solution obtained in step (1), and then add citric acid of 3.0% mass of the mixed solution obtained in step (1), stir for 5 hours to form a colloidal solution ;

[0035] (3) Add an ammonia solution with a mass concentration of 3% to the colloidal solution formed in step (2) and stir at the same time, stir for 10 hours until PH=10.0-11.0, a white precipitate is formed, and then stand and age for 48 hours;

[0036] (4) The white precipitate was washed with deionized water, filtered, and then spray-dried at 90°C at a drying temperature of 100°C, and then air-jet pulverized to obtain the precursor powder;

[0037] (...

Embodiment 3

[0040] A preparation method of nano-yttrium stabilized zirconia powder, comprising the following steps:

[0041] (1) Mix zirconium oxychloride, yttrium oxide, and deionized water at a mass ratio of 55:0.9:10, heat to 100°C, and keep warm for 2 hours to obtain a mixed solution;

[0042] (2) Add 8% gum arabic of the mixed solution obtained in step (1) to the mixed solution obtained in step (1), and then add 0.5% ethylenediaminetetraacetic acid and 1.0% of the mixed solution obtained in step (1) Citric acid, stirred for 4h to generate a colloidal solution;

[0043] (3) Add ammonia solution with a mass concentration of 1% to the colloidal solution formed in step (2) and stir at the same time, stir for 9 hours until PH=10.0-11.0, a white precipitate is formed, and then stand and age for 35 hours;

[0044] (4) The white precipitate was washed with deionized water, filtered, and then spray-dried at 95°C at a drying temperature of 90°C, and then air-jet pulverized to obtain the precu...

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Abstract

The invention discloses a preparation method of nanometer yttrium stabilized zirconia powder. The preparation method comprises mixing zirconium oxychloride, yttrium oxide and deionized water accordingto a mass ratio of (50-60): (0.8-1): (10-12), heating the mixture to 90-110 DEG C, carrying out heat preservation for 1-3h, adding plant gum into the mixture, then adding at least one of ethylenediaminetetraacetic acid or citric acid into the mixture, carrying out stirring for 3-5h to obtain a colloidal solution, adding an ammonia solution into the colloidal solution along with stirring for 8-10huntil pH of 10.0-11.0 so that white precipitates are produced, standing the white precipitates for aging for 24-48h, washing and filtering the precipitates, carrying out spray drying and fluid energymilling to obtain precursor powder, and calcining the precursor powder at 450-600 DEG C for 5-7h to obtain the nanometer yttrium stabilized zirconia powder. The zirconia powder has a high sintering shrinkage rate, high sintering density, good strength, good performances, small particle size and narrow distribution.

Description

technical field [0001] The invention belongs to the field of ceramics, and in particular relates to a preparation method of nano-yttrium stabilized zirconia powder. Background technique [0002] Zirconia, as a raw material for ceramic glaze, produces ceramic materials with the characteristics of high temperature resistance, wear resistance, corrosion resistance, high temperature resistance, good toughness and strength, and has a wide range of applications. [0003] As we all know, during the sintering process of zirconia powder, the power to promote its shrinkage and densification is the surface energy of the powder particles. The finer the powder particles, the greater the surface energy, the higher the shrinkage rate, the easier the material migration, the more conducive to the closeness and fusion between the grains, and the gas diffusion and discharge in the grain boundaries. Therefore, increasing the surface energy and shrinkage of zirconia powder can greatly increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02B82Y40/00C04B35/48
Inventor 韩亮
Owner 汉中市恒宝锆业科技有限责任公司
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