Zirconia powder added with trace elements and preparation method thereof

A technology of zirconia powder and trace elements is applied in the field of zirconia powder with trace elements and its preparation, which can solve the problems of reducing the stability of zirconia ceramic body, destroying the crystal structure of zirconia ceramic body, affecting the service life of ceramic body and the like

Active Publication Date: 2012-10-10
FUJIAN JOHNSON MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the acid concentration is below 15% and the temperature is from room temperature to 200°C (ie, medium temperature), its acid resistance is not ideal.
This is because compared with normal temperature, at medium temperature (RT-200°C), both yttrium and zirconium in the yttrium-containing zirconia ceramic body are easily dissolved, thereby destroying the crystal structure of zirconia ceramics and reducing the quality of zirconia ceramics. The stability of the body makes the zirconia ceramic body easy to break, which seriously affects the service life of the ceramic body, and the replacement of the ceramic body used in the medium-temperature dilute acid environment is very complicated, so the service life of the ceramic body is very important to the normal use of the user. and economic impact

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ZrOCl 2 ·8H 2 O and Y (NO 3 ) 3 ·6H 2 O is dissolved in deionized water, and the molar ratio of Zr and Y is preferably Zr:Y=97:3 (molar ratio) to form a solution. Filter, configure 10% by weight ammonia water, configure a peregrine solution with a concentration of 30g / L, add the above three solutions to the reaction kettle while stirring and stir well, control pH=8.9, form a condensate, and a peregal solution The volume of the added amount is 10% of the volume of the Zr and Y solutions;

[0024] The soluble salts of La, Ce, Al, Ca, Mg, Ti are made into 18% mixed solution;

[0025] Add the mixed solution of La, Ce, Al, Ca, Mg, Ti to the gel while stirring, and stir it thoroughly. The mixture is added dropwise to the stirred condensate and stirred well. , Ti, Mg) The weight ratio of Ox is: 1:0.0001, the molar ratio of La:Ce:Ca:Al:Mg:Ti=3:2:1:2:1:1;

[0026] The above gel was washed with deionized water until no negative chloride ions were detected with 0.11M silver...

Embodiment 2

[0029] With reference to the preparation steps of Example 1, the difference is: peregrine solution, the concentration is 180g / L, the weight ratio of ZrO: (La, Ce, Al, Ca, Ti, Mg) Ox is: 1:0.008, La:Ce : Molar ratio of Ca:Al:Mg:Ti=4:2:1:3:1:1; pH=9.3 during reaction. The obtained product was soaked for 100 hours at a temperature of 100 degrees, an acid concentration of 15%, and no zirconium and yttrium were dissolved out.

Embodiment 3

[0031] With reference to the preparation steps of Example 1, the differences are: peregrine solution, the concentration is 100 g / L, the weight ratio of ZrO: (La, Ce, Al, Ca, Ti, Mg) Ox is: 1:0.0005, La:Ce : Molar ratio of Ca:Al:Mg:Ti=1:0.3:0.1:0.5:0.5:0.3; pH=9.1 during reaction. The obtained product was soaked for 100 hours at a temperature of 110 degrees, an acid concentration of 11%, and no zirconium and yttrium were dissolved.

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PUM

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Abstract

The invention discloses zirconia powder added with trace elements, which comprises yttrium. The zirconia powder added with the trace elements is characterized in that trace La, Ce, Al, Ca, Ti and Mg elements are added into the zirconia powder, and the mass ratio of ZrO2 to (La, Ce, Al, Ca, Ti and Mg)Ox is 1:0.0001-0.008. The invention also discloses a preparation method for the zirconia powder. After the technical scheme is adopted, the trace La, Ce, Al, Ca, Ti and Mg elements are added when the yttrium-contained zirconia powder is prepared, and a reaction condition is controlled. After the produced zirconia powder is prepared into a ceramic body, the crystal structure of the ceramic body can be greatly reinforced by trace added ingredients, so that the produced ceramic body produced by the powder is unlikely to dissolve out yttrium and zirconium under the conditions of intermediate temperate (RT(range temperature)-200DEG C) and concentration below 15%, and the ceramic body has good structure stability, so the service life of the ceramic body is greatly prolonged.

Description

technical field [0001] The invention relates to the field of special ceramic materials, in particular to a zirconia powder added with trace elements and a preparation method thereof. Background technique [0002] At present, the yttrium-containing zirconia powder produced at home and abroad, for example, the ceramic body produced by 3mol% zirconia powder has good acid resistance under normal temperature environment compared with other ceramics such as alumina. However, when the acid concentration is below 15% and the temperature is from normal temperature to 200 °C (ie medium temperature), the acid resistance is not ideal. This is because compared with normal temperature, yttrium and zirconium in the yttrium-containing zirconia ceramic body are easily dissolved in the medium temperature (RT-200 ℃) environment, thereby destroying the crystal structure of zirconia ceramics and reducing zirconia ceramics. The stability of the body makes the zirconia ceramic body easy to ruptur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/63
Inventor 徐卫东郑炜
Owner FUJIAN JOHNSON MINING
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