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A scandia-stabilized zirconia solid solution and its preparation process

A preparation process, zirconia technology, applied in the field of zirconia solid solution and its preparation process, can solve the problems of high ionic conductivity, low activation energy, etc., and achieve the effect of small specific surface area, good sintering activity and simple process

Inactive Publication Date: 2015-12-23
青岛天尧实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the zirconia (ScSZ) stabilized by scandia has been found to have higher ionic conductivity and lower activation energy, and has a higher ionic conductivity than traditional 8mol% yttria-stabilized zirconia at the same service temperature (800- 1000°C) higher conductivity

Method used

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  • A scandia-stabilized zirconia solid solution and its preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation process of scandium oxide-stabilized zirconia solid solution, the specific steps are:

[0024] 1) ZrOCl 2 ·8H 2 O2 2.90Kg, ScCl 3 ·6H 2 O4.14Kg and CeCl 3 ·7H 2 0.30Kg is made into mixed aqueous solution;

[0025] 2) Add ammonia water for co-precipitation and adjust the pH value to 7.70;

[0026] 3) Wash with water, control Cl - Content less than 100ppm, centrifugal dehydration;

[0027] 4) The dehydrated powder is dried at 150°C;

[0028] 5) The dried powder is pre-calcined at 400°C to obtain primary powder;

[0029] 6) The primary powder is calcined in an oxidizing atmosphere, the conditions are: the heating rate is 1°C / min, the temperature is raised to 800°C, and kept for 30 hours;

[0030] 7) The calcined powder is milled by a vertical ball mill with high-energy ball milling, adding 50 g of modified ammonium polyacrylate, and milling to a medium particle size of D 50 0.40-0.60μm, specific surface area=10.50±1.00m 2 / g;

[0031] 8) Spray dr...

Embodiment 2

[0034] A preparation process of scandium oxide-stabilized zirconia solid solution, the specific steps are:

[0035] 1) Zr(NO 3 ) 4 ·5H 2 O29.60Kg, Sc (NO 3 ) 3 ·H 2 O3.95Kg and Ce (NO 3 ) 3 ·5H 2 0.99Kg is made into mixed solution;

[0036] 2) Add ammonia water for co-precipitation and adjust the pH value to 9.00;

[0037] 3) Water washing, control NO 3 - Ion content is less than 100ppm, centrifugal dehydration;

[0038] 4) The dehydrated powder is dried at 200°C;

[0039] 5) The dried powder is pre-calcined at 500°C to obtain primary powder;

[0040] 6) The primary powder is calcined in an oxidizing atmosphere, the conditions are: the heating rate is 3°C / min, the temperature is raised to 900°C, and kept for 20 hours;

[0041] 7) The calcined powder is milled by a vertical ball mill with high-energy ball milling, adding 50 g of modified ammonium polyacrylate, and milling to a medium particle size of D 50 0.40-0.60μm, specific surface area=10.50±1.00m 2 / g;

[...

Embodiment 3

[0045] A preparation process of scandium oxide-stabilized zirconia solid solution, the specific steps are:

[0046] 1) Zr(SO 4 ) 2 4H 2 O23.39Kg, Sc 2 (SO 4 ) 3 ·6H 2 O3.81Kg and Ce(SO 4 ) 2 4H 2 O1.90Kg is made into mixed solution;

[0047] 2) Add ammonia water for co-precipitation and adjust the pH value to 10.50;

[0048] 3) Washing with water to control SO 4 2- Ion content is less than 100ppm, centrifugal dehydration;

[0049] 4) The dehydrated powder is dried at 250°C;

[0050] 5) The dried powder is pre-calcined at 600°C to obtain primary powder;

[0051] 6) The primary powder is calcined in an oxidizing atmosphere, the conditions are: the heating rate is 5°C / min, the temperature is raised to 1000°C, and kept for 10 hours;

[0052] 7) The calcined powder is milled by a vertical ball mill with high-energy ball milling, adding 50 g of modified ammonium polyacrylate, and milling to a medium particle size of D 50 0.40-0.60μm, specific surface area=10.50±1.00m...

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Abstract

The invention relates to a preparation technology of a scandia-stabilized zirconia solid solution, which comprises the specific steps of 1), preparing zirconium salt, scandium salt and a third component salt into a mixed solution, 2), adding ammonia water for coprecipitation, and adjusting a PH value, 3), water washing and centrifugal dewatering, 4), drying, 5), precalcination, and 7), high-energy ball milling. Compared with other method technologies, the preparation technology of the scandia-stabilized zirconia solid solution is simple, requirements on equipment are not high, the technology stability is excellent, the preparation technology is very suitable for industrial production, powder prepared by the preparation technology is suitable for high-temperature solid oxide fuel cells, and the powder is also suitable for moderate-temperature solid oxide fuel cells as the powder can keep higher conductivity at a moderate temperature section.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a scandium oxide-stabilized zirconia solid solution and a preparation process thereof. Background technique [0002] In recent years, SOFC has developed particularly rapidly. Due to unexpected power outages and other sudden disasters, various accidents have been caused. Using fuel cells as a distributed power supply method can minimize the impact of disasters. At the same time, due to the increasing scarcity of energy, fuel cells are widely concerned as clean energy with high energy conversion rate. [0003] Among them, the fuel cell electrolyte material is a key technology in the fuel cell technology, and the current research direction is mainly focused on obtaining higher conductivity. However, the zirconia (ScSZ) stabilized by scandia has been found to have higher ionic conductivity and lower activation energy, and has a higher ionic conductivity than traditional 8mol% y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/63
Inventor 闫家臣赵冰李子涵魏基业
Owner 青岛天尧实业有限公司
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