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Method for preparing yttria-stabilized zirconia powder

A technology for stabilizing zirconia and yttrium oxide, applied in the field of material chemistry, can solve the problem of not completely eliminating hard agglomeration, affecting the application performance of powder, and high ceramic sintering temperature, achieving control of product particle size, solving the problem of powder agglomeration, enhancing The effect of vibration and shear

Inactive Publication Date: 2011-08-31
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical synthesis method represented by the co-precipitation method has received widespread attention because of its advantages of simple equipment, convenient operation, and low cost. However, the powder prepared by the co-precipitation method often has the problem of hard agglomeration
Although washing with ethanol or other organic solvents can remove the coordinated water molecules on the surface and avoid the occurrence of hard agglomerates, but practice shows that this cannot completely eliminate hard agglomerates
The phenomenon of hard agglomeration seriously affects the application performance of the powder, resulting in adverse consequences such as high sintering temperature and poor sintering performance of ceramics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh 3.22g ZrOCl·8H 2 O was placed in a beaker, and 20 mL of deionized water was added. After it was completely dissolved, 0.2 g of Triton-100 was added as a dispersant. Weigh 0.0226g Y 2 o 3 In another beaker, under heating, add concentrated nitric acid until it dissolves completely. Mix the above two solutions, place the beaker containing the reaction solution in an ultrasonic disperser, and add 30% ammonia water under the working conditions of the ultrasonic disperser until the precipitation is complete. Suction filter and wash the precipitate until no chloride ions are present by testing with silver nitrate. The filtered precipitate was dried in a microwave reactor for 6 hours. After drying, grind finely. The above precursor was placed in a crucible, and heated and calcined in a muffle furnace at 700°C for 3 hours. Natural cooling, airflow pulverization, the obtained 2% yttria stabilized zirconia powder with a particle size of about 25nm.

Embodiment 2

[0015] Weigh 3.22g ZrOCl·8H 2 Add 20mL of deionized water to a beaker, and after it is completely dissolved, add 0.2g of Tuwin-60 as a dispersant. Weigh 0.0339g Y 2 o 3 In another beaker, under heating, add concentrated nitric acid until it dissolves completely. After mixing the above two solutions, place the beaker containing the reaction solution in an ultrasonic disperser, and add 30% ammonia water under the working conditions of the ultrasonic disperser until the precipitation is complete. Suction filter and wash the precipitate until the precipitation is filtered and washed with silver nitrate until no chloride ions exist. The filtered precipitate was dried in a microwave dryer for 3 hours, and then ground into fine particles after drying. The above-mentioned precursor was placed in a crucible, and heated and calcined in a muffle furnace at 600°C for 1 hour. Natural cooling, airflow pulverization, the obtained 3% yttria stabilized zirconia powder with a particle size...

Embodiment 3

[0017] Weigh 3.22g ZrOCl·8H 2 O was placed in a beaker, and 20 mL of deionized water was added. After it was completely dissolved, 0.2 g of polyethylene glycol was added as a dispersant. Weigh 0.09g Y 2 o 3 In another beaker, under heating, add concentrated nitric acid until it dissolves completely. Mix the above two solutions, place the beaker containing the reaction solution in an ultrasonic disperser, and add 30% ammonia water under the working conditions of the ultrasonic disperser until the precipitation is complete. Suction filter and wash the precipitate until the precipitation is filtered and washed with silver nitrate until no chloride ions exist. Place the filtered precipitate in a microwave dryer to dry for 5 hours. After drying, grind it finely and pack it into a bag. The above precursor was taken out and placed in a crucible, and heated and calcined in a muffle furnace at 600°C for 6 hours. Natural cooling, jet crushing, the obtained 8% yttrium stabilized zir...

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Abstract

The invention belongs to the field of material chemistry, and in particular relates to a method for preparing yttria-stabilized zirconia powder. The method particularly adopts an ultrasonic-microwave synthesis method, carries out precursor preparation under an ultrasonic condition so as to ensure that a system can be better dispersed and doped, and adopts a microwave heating mode to dry the precursor so as to avoid agglomeration of the precursor. After the precursor is calcined at high temperature, the yttria-stabilized zirconia powder can be obtained. The powder has good dispersity, and has grain diameter reaching nanometer grade, uniform sizes and uniform distributions. The method has the advantages of simple process, low cost and the like.

Description

technical field [0001] The invention belongs to the field of material chemistry, and in particular relates to a preparation method of yttria-stabilized zirconia powder. Background technique [0002] Yttria-stabilized zirconia (YSZ) is an excellent oxygen ion conductor and is stable in both oxidizing and reducing atmospheres. It is the most commonly used electrolyte for solid oxide fuel cells (SOFCs) and is also widely used in oxygen detectors. , Oxygen separation membranes, etc., especially in the field of functional ceramics, are widely used. [0003] In order to obtain good ceramic sintering activity, the powder particles are required to be small, evenly distributed, and free from agglomeration, and the shape of the powder particles is expected to be regular. In addition, since the densification rate of ceramic powder is inversely proportional to the fourth power of its particle size, in order to obtain high-performance ceramic materials, it is necessary to use powder raw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C01B25/02
Inventor 刘金库钟新华尹晓光王建栋罗重霄
Owner EAST CHINA UNIV OF SCI & TECH