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Scandium-and-cerium-doped zirconium oxide ultrafine powder and preparation method thereof

An ultra-fine powder, zirconia technology, applied in zirconia and other directions, can solve the problems of zirconia powder particle size, specific surface area cannot be effectively controlled, sintering activity is not high, difficult to control and improve sample performance, etc. The effect of large-scale industrial production, simple preparation process and low cost

Inactive Publication Date: 2021-03-30
FIRST RARE MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most zirconia powders prepared by hydrothermal method use polyethylene glycol (PEG4000, PEG6000, etc.) as a dispersant, which is a non-ionic surface agent. The specific surface area of ​​the body is about 1m2 / g, the sintering activity is not high, and there is still room for further improvement in its performance
Moreover, the above various preparation methods cannot effectively control the particle size and specific surface area of ​​the zirconia powder, and it is difficult to control and improve the performance of the sample.

Method used

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  • Scandium-and-cerium-doped zirconium oxide ultrafine powder and preparation method thereof
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  • Scandium-and-cerium-doped zirconium oxide ultrafine powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of doping scandium cerium zirconia ultrafine powder, such as figure 1 shown, including the following steps:

[0036]Step 1. Weigh 8.62g of scandium oxide in a beaker, add 6mol / L hydrochloric acid to boil and dissolve to prepare a scandium-containing solution, then weigh 385g of zirconium oxychloride octahydrate and 5.2g of cerium chloride heptahydrate and dissolve them in water, and mix with scandium-containing The solution was mixed evenly and prepared into 1L mixed salt solution;

[0037] Step 2: Add 4g of CTAB to the above mixed salt solution as a dispersant, heat and stir in a water bath until the CTAB is completely dissolved, then slowly add concentrated ammonia water dropwise to form a gel-like precipitate, keep heating and stirring in a water bath, and periodically pulverize the condensate Colloidal precipitation to avoid its complete coagulation, and the reaction ends when the pH of the solution is 9-10;

[0038] Step 3, the precip...

Embodiment 2

[0042] A kind of preparation method of doping scandium cerium zirconia ultrafine powder, such as figure 1 shown, including the following steps:

[0043] Step 1, configuration is the same as the mixed salt solution described in step 1 in Example 1;

[0044] Step 2: Add 20g of dispersant CTAB to the above mixed salt solution, heat in a water bath at 80°C and stir until CTAB is completely dissolved, then slowly add concentrated ammonia water dropwise to form a gel-like precipitate, keep the state of heating and stirring in the water bath, and periodically Crush the gel precipitate and dilute with water until the precipitate no longer coagulates, and the reaction ends when the pH of the solution is 9-10;

[0045] Step 3. Suction filter and wash the precipitate after the reaction to obtain a filter cake. First, take a small amount of filter cake to dry and conduct an infrared spectrum test to obtain the composition form of zirconium in it, as shown in Table 1; in addition, take an...

Embodiment 3

[0049] A kind of preparation method of doping scandium cerium zirconia ultrafine powder, such as figure 1 shown, including the following steps:

[0050] Step 1, configuration is the same as the mixed salt solution described in step 1 in Example 1;

[0051] Step 2. Add 25g of dispersant CTAB to the above mixed salt solution, heat and stir in a water bath until CTAB is completely dissolved, then slowly add concentrated ammonia water dropwise to form a gel-like precipitate, keep the state of heating and stirring in a water bath, and periodically pulverize the condensate The gel is precipitated and diluted with water until the precipitate no longer coagulates, and the reaction is completed when the pH of the solution is 9-10;

[0052] Step 3. Suction filter and wash the precipitate after the reaction to obtain a filter cake. First, take a small amount of filter cake to dry and conduct an infrared spectrum test to obtain the composition form of zirconium in it, as shown in Table 1...

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Abstract

The invention discloses scandium-and-cerium-doped zirconium oxide ultrafine powder and a preparation method thereof. According to the invention, CTAB is used as a dispersing agent to prepare scandium-and-cerium-doped zirconium oxide ultrafine powder. The preparation method comprises the following steps: firstly, converting a Zr(OH)4 precipitate into monoclinic zirconium oxide by adopting a hydrothermal method to obtain a tetragonal zirconium oxide precursor with enough nucleation core particles; and then conducting calcining to enable tetragonal zirconium oxide crystals to grow into proper particles, thereby preparing the scandium-and-cerium-doped zirconium oxide ultrafine powder with uniform particle size, small particle size and high specific surface area. The preparation method is simple in process and easy for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of zirconia nanometer materials, in particular to a scandium-cerium-doped zirconia ultrafine powder and a preparation method thereof. Background technique [0002] As an important ceramic material, zirconia has excellent physical and chemical properties: high melting point and high boiling point, good thermal conductivity, high high temperature strength and toughness, good corrosion resistance and wear resistance, etc. With the development of science and technology, the application of zirconia as a component of solid fuel cells and solid electrolytes has become one of the current research and development hotspots. [0003] Under normal pressure, zirconia has three crystal forms: Monoclinic, Tetragonal and Cubic. When the temperature reaches 1170°C, zirconia undergoes a martensitic transformation: by Monoclinic zirconia (m-ZrO 2 ) into metastable tetragonal zirconia (t-ZrO 2 ), when the temperature reaches 2370°C, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02
CPCC01G25/02C01P2004/62C01P2006/12
Inventor 王屹波张明王继民朱刘
Owner FIRST RARE MATERIALS CO LTD
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