Preparation method of nano-yttrium-stabilized zirconia-alumina composite powder

A technology of zirconia powder and composite powder, applied in the field of powder material preparation, can solve the problems of narrow particle size distribution, difficult to synthesize high-performance composite powder, small particle size, etc., and achieve the effect of simple operation and easy industrialization

Active Publication Date: 2019-05-03
CENT SOUTH UNIV
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Problems solved by technology

[0004] Based on this, it is necessary to provide a method for preparing nano-yttrium stabilized zirconia-alumina composite powder by hydrothermal method-ball milling mixing method in order to solve the technical problems of high production cost and difficulty in synthesizing high-performance composite powder in the prior art , through this method, composite powders with monodispersity, small particle size, narrow particle size distribution, controllable particle size and crystal form can be prepared, and the production process is simple and suitable for large-scale production

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  • Preparation method of nano-yttrium-stabilized zirconia-alumina composite powder
  • Preparation method of nano-yttrium-stabilized zirconia-alumina composite powder

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[0032] A method for preparing nano-yttrium stabilized zirconia-alumina powder by hydrothermal hydrolysis-ball milling mixing mode, the preparation method comprising the following steps:

[0033] 1) Reaction solution preparation method: prepare zirconium oxychloride, yttrium chloride, dispersant raw material solution, its Zr 4+Concentration 0.1~2.5mol / L, Zr 4+ with Y 3+ The molar concentration ratio is 99:2~90:20, the concentration of dispersant is 0.5~5g / L, the raw material solution is placed in the reaction kettle, under the condition of temperature 25~90℃, high speed stirring 300~10000r / min, through the mist Add the concentration of 0.5-6mol / L ammonia solution or 0.1-3mol / L hydrochloric acid solution at 1-10000mL / min to adjust the raw material solution H + Concentration, so that Zr in the solution 4+ Partial hydrolysis to generate crystal nuclei, adjust the solution H + The concentration is 0.1-5mol / L to control the amount of crystal nuclei generated by hydrolysis, that ...

Embodiment 1

[0040] (1) Preparation of ZrOCl 2 , YCl 3 , hydroxypropyl cellulose mixed solution, solution C Zr 4+ =0.6mol / L, C Y 3+ =0.0245mol / L (the molar ratio is Zr 4+ :Y 3+ =98:4), the final H + The concentration is 1.2mol / L, and the concentration of hydroxypropyl cellulose is 0.5g / L to obtain the hydrothermal reaction solution;

[0041] (2) Transfer the obtained solution to a polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, raise the temperature to 180° C. for 12 hours of hydrothermal reaction, and cool after the hydrothermal reaction is completed to obtain a hydrated zirconia suspension;

[0042] (3) Add 10% dilute ammonia solution dropwise at 10 mL / min to Y 3+ Uniformly precipitate on the surface of hydrated zirconia in the form of yttrium hydroxide until the pH of the hydrated zirconia suspension is greater than 9. After the yttrium sinking reaction is completed, statically age for 24 hours and centrifuge to obtain the hydrated zirconia precipitat...

Embodiment 2

[0046] (1) Preparation of ZrOCl 2 , YCl 3 , hydroxypropyl cellulose mixed solution, the raw material solution is placed in the reaction kettle, under 60 ℃ water bath, 500r / min stirring, by adding 2.8mol / L ammonia solution to adjust the final reaction solution H + concentration, so that the solution final C H + =1.2mol / L, C Zr 4+ =1.0mol / L, C Y 3+ =0.0408mol / L (molar ratio Zr 4+ :Y 3+ =98:4), the hydroxypropyl cellulose concentration is 0.5g / L, obtains hydrothermal reaction solution;

[0047] (2) Transfer the solution obtained in (1) to a polytetrafluoroethylene-lined stainless steel hydrothermal reaction kettle, raise the temperature to 180 ° C for 12 hours of hydrothermal reaction, after the hydrothermal reaction is completed, take out the hydrothermal reaction kettle to cool, and obtain hydration oxidation zirconium suspension;

[0048] (3) Add 10% dilute ammonia solution dropwise at 10 mL / min to Y 3+ Uniformly precipitate on the surface of hydrated zirconia in th...

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Abstract

The invention relates to a preparation method of nano-yttrium-stabilized zirconia-alumina composite powder. The preparation method comprises the following steps: mixing a zirconium salt, a yttrium salt and a dispersing agent, and adding ammonia water or an acid solution into the mixture to adjust the H<+>; heating the solution subjected to adjustment of H<+> concentration to carry out a hydrothermal reaction, and carrying out cooling to 90 DEG C or below after the reaction is completed; adding ammonia water into the obtained hydrated zirconia suspension to adjust the pH to be alkaline, carrying out standing and aging, and carrying out centrifugal separating; washing and drying the hydrated zirconia precipitates and carrying out calcining; and uniformly mixing the obtained nano-yttrium-stabilized zirconia powder with aluminum oxide powder, deionized water and a dispersing agent, then carrying out ball milling, and carrying out grinding, centrifugal separation and drying on the obtainedslurry to obtain the nano-yttrium-stabilized zirconia-alumina composite powder. The high-performance composite powder can be prepared by the method, and the production process is simple to operate andis suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of powder material preparation, and more specifically, relates to a preparation method of nano-yttrium-stabilized zirconia-alumina composite powder. Background technique [0002] At present, the high-tech industry is in a period of rapid development. Materials are one of the three pillars of modern science and technology. Among them, ceramic materials have entered a stage of rapid development due to their excellent physical and chemical properties, and have wide applications or potential in various aspects. value. Zirconia is a very important structural material. Rare earth-doped stabilized zirconia, especially yttrium-doped stabilized zirconia, has low thermal conductivity, good strength and toughness, low elastic modulus, high thermal shock resistance, and high operating temperature. Among various metal oxide ceramics, zirconia is second only to alumina ceramics in importance. Zirconia ceramics is a very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/48C04B35/626
Inventor 刘智勇朱银李启厚刘志宏洪明浩
Owner CENT SOUTH UNIV
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