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: 2010-05-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Benefits of technology

The new type of ceramics called yellow perovskites (YPZ) have been developed over recent years due to their unique properties such as improved stability compared to existing materials like silicate glasses or alumina. These compounds were found to improve certain characteristics related to these applications including reduced power consumption, increased thermal conductivity, decreased abrasion wear on tools used in machining processes, higher levels of purity, controlled particle sizes, and more efficient production methods than previous ones.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the quality of fine crystal structure made up of yttri stabilized zircrockscite (YSZ), which plays important roles during fabricating various types of electronic devices like SOC's. Previous attempts have resulted in large amounts of impurities being incorporated into these compositions due to their insufficient purity levels. To address this issue, researchers explored ways to prevent hard aggregations caused by excessive grain growth while maintaining desired characteristics.

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

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Claims

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Application Information

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Owner EAST CHINA UNIV OF SCI & TECH
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