Prepn process of spherical nanometer crystal zirconium dioxide powder for structural ceramic

A technology of spherical particles and nanocrystals, which is applied in the field of preparation of nanocrystalline spherical particle powders, can solve problems such as large specific surface area, high technical difficulty, and high activity, and achieve uniform particle distribution, simple preparation process, and good dispersion performance Effect

Inactive Publication Date: 2005-09-28
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, because the powder is very fine, the specific surface area is large, the activity is high, and the water absorption is strong, the powder is difficult to preserve
The technology is difficult, the conditions are harsh, the production efficiency is low, and the production cost is high
Therefore, it is difficult to adopt in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: the specific preparation process and steps of this embodiment are as follows:

[0022] 1. Using ZrOCl 2 ·8H 2 O and YCl 3 As raw materials, dissolved in water respectively, according to its oxides, the preparation of Y 2 o 3 / ZrO 2 A solution with a ratio of 3% mol will contain 3 mol% Y 2 o 3 ZrOCl 2 The solution is placed in a reaction kettle; under constant stirring, it is heated to evaporate and decompose, and the heating temperature is 105°C;

[0023] 2. Dilute with water to control the ZrO in the solution 2 The concentration of the solution is 50g / L; heat up to make the temperature of the solution reach 70°C;

[0024] 3. Under continuous stirring, slowly drop NH with a volume ratio of 1:1 4 OH aqueous solution and 10wt% (NH 4 ) 2 CO 3 Aqueous solution, adjust the pH value of the solution to 9-10, and heat the reaction for 2-2.5 hours to completely precipitate the yttrium-zirconium hydrated oxide:

[0025] 4. Filter, and wash the above ...

Embodiment 2

[0031] Embodiment two: the technological process and steps of this embodiment are exactly the same as the above-mentioned embodiment one, and the difference is that some process parameters have been changed, specifically as follows:

[0032] 1. The heating temperature for evaporative decomposition of the raw material solution is 110°C,

[0033] 2. Dilute with water to control ZrO 2 The concentration of the solution is 110g / L, heat up to make the temperature of the solution reach 80°C,

[0034] 3. Adjust the pH value of the solution to 10, and heat the reaction for 2.5 hours,

[0035] 4. Negative pressure dehydration and drying, the drying temperature is 180°C, and the drying time is 6 hours;

[0036] 5. The dehydrated dry powder is placed in an electric furnace and calcined at 850°C for 3 hours;

[0037] 6. Add 5% binder polyvinyl alcohol and 1.5% dispersant ammonium DGA40 to the slurry, and grind the slurry for 20 hours;

[0038] 7. The temperature for spray drying and gr...

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Abstract

The present invention is preparation process of spherical nanometer crystal zirconium dioxide powder stabilized with yttrium oxide and belongs to the field of the technology of preparing nanometer zirconium dioxide and specific ceramic, and the zirconium dioxide powder is main material for making structural ceramic. Nanometer crystal zirconium dioxide powder is prepared through hydrothermal decomposition and deposition process and then added with adhesive and dispersant, and the mixture is then spray dried to prepare yttrium doped spherical nanometer crystal zirconium dioxide powder. The present invention features the simple technological process, and the spherical nanometer crystal zirconium dioxide powder has great specific surface area, homogeneously distribution particle size, no coagulation and good dispersivity.

Description

technical field [0001] The invention relates to a method for preparing nanocrystalline spherical particle powder of zirconia stabilized with yttrium oxide. The zirconia particle powder is a main raw material for manufacturing structural ceramics and belongs to the technical field of nano zirconia preparation and special ceramic preparation. Background technique [0002] Tetragonal zirconia is an important structural ceramic material. Add Y to zirconia 2 o 3 Partially stabilized zirconia (Y-TZP), which forms a solid solution, has high toughness, high plasticity, high flexural strength and wear resistance, so it is widely used in structural ceramics. But in order to improve toughness ZrO 2 The sintering performance of ceramics must maintain the physical properties of its powder, such as the particle size of the powder, the surface properties of the powder, the dispersion performance of the powder, the fluidity of the powder, the distribution performance of the powder, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
Inventor 林振汉吴亮张玲秀柳志龙平信义豆斌朝
Owner SHANGHAI UNIV
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