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Preparation method of uniform-size spherical yttrium-stabilized zirconia nano powder

A technology of yttrium-stabilized zirconia and nanopowder, which is applied in zirconia and nanotechnology, can solve the problems of poor crystallinity of nanoparticles, high requirements for reaction equipment, cumbersome treatment of chloride ions, etc., and achieve less growth defects and better orientation Good, hard effect

Active Publication Date: 2017-04-26
安徽凯盛应用材料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In recent years, some new technologies have also emerged, such as Chinese invention patent 201310043645.9, which uses supercritical hydrothermal synthesis of nano-zirconia powder, the crystallinity of the prepared nanoparticles is poor, and the requirements for reaction equipment are high. high cost etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing spherical yttrium-stabilized zirconia nanopowder with uniform size adopts the following specific steps:

[0034] Weigh 284g of zirconium sulfate and 14g of yttrium sulfate powder, add a certain amount of water to form a 1M solution. Add the precipitating agent urea to the prepared solution above, wherein the molar ratio of zirconium sulfate and urea is 1:6. Then add 3% dispersant polyethylene glycol-4000 and mix well. The above solution was poured into a hydrothermal reaction kettle with a filling volume of 70%, stirred at room temperature for 30 minutes, and the stirring rate was 200 rpm.

[0035] The reaction is carried out at 70° C., and the reaction ends when it is complete. The product was taken out, washed with water and ethanol, freeze-dried, stabilized and calcined at 400° C. for 1 hour, and the nano-scale semi-stable yttrium zirconia was prepared after the stabilization treatment.

[0036] The crystallization performance of the powder ...

Embodiment 2

[0038] A method for preparing spherical yttrium-stabilized zirconia nanopowder with uniform size adopts the following specific steps:

[0039] Weigh 343g of zirconium nitrate and 9g of yttrium nitrate powder, add a certain amount of water to prepare a 1M solution. Add precipitant urea to the prepared solution, wherein the molar ratio of zirconium nitrate and urea is 1:4. Then add 5% dispersant polyethylene glycol-4000 and mix well.

[0040] Pour the above solution into a hydrothermal reaction kettle with a filling volume of 70%, and stir at room temperature for 30 minutes at a stirring rate of 300 rpm. The reaction was carried out at a temperature of 150° C. for 4 hours, and the reaction ended after the precipitation was complete. The product is taken out, washed with water and ethanol, and freeze-dried to obtain nano-scale semi-stable yttrium zirconia.

[0041] The dried nano-scale yttrium-stabilized zirconia was stabilized and calcined at 600° C. for 1 hour, and the yttri...

Embodiment 3

[0044] A method for preparing spherical yttrium-stabilized zirconia nanopowder with uniform size adopts the following specific steps:

[0045] Weigh 284g of zirconium sulfate and 14g of yttrium sulfate powder, add a certain amount of water to form a 1 M solution. Add precipitant urea to the prepared solution, wherein the molar ratio of zirconium sulfate and urea is 1:2.5. Then add 2% dispersant polyethylene glycol and mix thoroughly.

[0046] Pour the above solution into a reaction kettle with a filling volume of 80%, and stir at room temperature for 30 minutes. The reaction was carried out at 200°C for 4 hours. After the reaction was over, it was cooled naturally. The product is taken out, washed with water and ethanol, and freeze-dried to obtain nano-scale semi-stable yttrium zirconia.

[0047] The dried nano-scale yttrium-stabilized zirconia was stabilized and calcined at 500° C. for 1 hour, and the tetragonal spherical yttrium-stabilized zirconia nanopowder was prepare...

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Abstract

The invention provides a preparation method of uniform-size spherical yttrium-stabilized zirconia nano powder. The method is characterized by comprising the following steps: making a zirconium source and a yttrium source into a solution; adding a precipitant into the solution; stirring sufficiently and adding a dispersing agent; putting the mixed solution into a reaction kettle; stirring at room temperature, and heating for reacting for a period of time to obtain a product; washing the product with water and ethanol; performing freeze drying to obtain semi-stable nano-scale yttrium-stabilized zirconium; and performing thermal stabilization treatment to obtain spherical yttrium-stabilized zirconia nano powder. The method provided by the invention has the following advantages: the prepared yttrium-stabilized zirconia nano powder is of uniform size distribution, spherical morphology and high crystallinity and exists stably in a tetragonal phase under a room-temperature condition.

Description

[0001] Technical field: [0002] The invention relates to the field of nanomaterial production, in particular to a method for preparing spherical yttrium-stabilized zirconia nanopowder with uniform size. [0003] Background technique: [0004] Zirconia (ZrO 2 ) is a very important structural and functional material with chemical stability, wear resistance, low thermal conductivity, high temperature resistance, corrosion resistance, thermal stability and impact resistance. It is a refractory coating material, high temperature It is an important raw material for structural materials, biomaterials, and electronic materials, and has been widely used in the fields of energy, materials, electronics, and the environment. [0005] Pure ZrO at room temperature 2 It is a white crystal with a melting point of 2680°C and a boiling point of 4275°C. Zirconium dioxide is a polycrystalline system, which can be divided into three crystal forms: monoclinic (Monoclinic, m-ZrO 2 ), Tetragonal ...

Claims

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Application Information

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IPC IPC(8): C01G25/02B82Y40/00
CPCB82Y40/00C01G25/02C01P2004/32C01P2004/64C01P2004/80C01P2006/12
Inventor 王永和刘强秦云峰严回胡石磊董树人
Owner 安徽凯盛应用材料有限公司
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