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Rare earth-doped strontium cerate nano crystal ceramic preparing method

A rare earth doping and nanocrystalline technology, applied in the field of inorganic ceramic material manufacturing, can solve the problems of high synthesis and sintering temperature, poor thermal stability of ceramics, poor composition uniformity, etc., and achieves low reaction temperature and sintering temperature and good thermal stability. , The effect of smooth surface with less defects

Inactive Publication Date: 2005-05-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ceramic powder prepared by solid phase synthesis has large particles, poor composition uniformity, and high synthesis and sintering temperature
Although the co-precipitation method is simple, the grain growth of the powder produced is too fast, which is not suitable for control; at the same time, the thermal stability of the prepared ceramics is poor, and the grains are easy to grow during the sintering process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment one: preparation SrCe 0.95 Yb 0.05 o 3 nanocrystalline ceramics

[0010] Will Yb 2 o 3 0.233g is dissolved in 20ml concentrated nitric acid, as A raw material, Sr(NO 3 ) 2 5.00g is made into a solution with 20ml of deionized water, and as the B raw material, Ce(NO 3 ) 3 ·6H 2 O 9.75g is made into a solution with 20ml of deionized water as the raw material of C. After stirring and mixing the raw materials of A, B, and C, add 2.0 times the ion weight (19.9g) of citric acid to make a solution of about 250ml. Under stirring or ultrasonic vibration, the solution was adjusted to pH = 7-8 with concentrated ammonia water, and heated in a water bath at 60°C until it turned into a transparent gel. The wet gel is infrared dried or vacuum dried at 120°C for 15 hours, and then becomes an opaque dry gel, and then calcined at 1000°C for 6 hours for synthesis reaction, and finally pure orthorhombic nano-ceramic powder can be obtained. The prepared ceramic powder ...

Embodiment 2

[0012] Embodiment two: preparation SrCe 0.90 Y 0.10 o 3 nanocrystalline ceramics

[0013] Will Y 2 o 3 0.535g is dissolved in 20ml concentrated nitric acid, as A raw material, Sr(NO 3 ) 2 5.00g is made into a solution with 20ml of deionized water, and as the B raw material, Ce(NO 3 ) 3 ·6H 2 O 9.26g was prepared into a solution with 20ml of deionized water as C raw material. After A, B, and C raw materials were stirred and mixed, citric acid with 2.0 times the ion weight (19.9 g) was added to form a solution of about 250 ml. Adjust the pH to 4-5 with ammonia water, and heat in a water bath at 70°C until it turns into a transparent gel. The wet gel was dried by infrared or vacuum at 130° C. for 10 hours, and then it became an opaque dry gel. Then calcined at 1000°C for 8 hours to carry out the synthesis reaction, and finally obtain nano-ceramic powder, press the prepared ceramic powder into a disc with a diameter of 20 mm and a thickness of 1 mm under isostatic pre...

Embodiment 3

[0015] Embodiment three: preparation SrCe 0.85 Yb 0.15 o 3 nanocrystalline ceramics

[0016] Will Yb 2 o 3 0.699g is dissolved in 20ml concentrated nitric acid, as A raw material, Sr(NO 3 ) 2 5.00g is made into a solution with 20ml of deionized water, and as the B raw material, Ce(NO 3 ) 3 ·6H 2 8.72g of O was made into a solution with 20ml of deionized water as C raw material. After A, B, and C raw materials were stirred and mixed, citric acid with 2.0 times the ion weight (19.9 g) was added to form a solution of about 250 ml. Adjust the pH to 7-8 with ammonia water, and heat in a water bath at 60°C until it turns into a transparent gel. Dry the wet gel in a microwave oven (power 800W) for 150 seconds to become an opaque dry gel, then calcined at 1000°C for 6 hours to carry out the synthesis reaction, and finally obtain nano-ceramic powder. SrCe was obtained by isostatic pressing at 20 MPa to form a disc with a diameter of 20 mm and a thickness of 1 mm, and then ...

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Abstract

The invention relates to a preparation method of rare earth-doped strontium cerate nanocrystalline ceramics, which belongs to the technical field of inorganic ceramic material manufacturing. The present invention mainly adopts the sol-gel method, and the method is characterized in that: with cerous nitrate, strontium nitrate or strontium acetate, rare earth oxides as raw materials, rare earth oxides are dissolved in concentrated nitric acid to prepare rare earth nitrates, the concentration is 0.04- 0.2mol / L; ceramic composition is SrCe 1-x RE x o 3 , where the value of x is in the range of 0.02-0.20; cerous nitrate, strontium nitrate or strontium acetate are made into aqueous solution, the concentration is 0.2-2mol / L, the two are mixed with rare earth nitrate, and the ratio of the three is based on the prepared It depends on the composition of ceramics; citric acid is used as a complexing agent, and the amount of citric acid added is 1.5-2.5 times the total molar amount of metal ions; under stirring or ultrasonic vibration, and heating in a water bath at a temperature of 50-80 ° C; Adjust the pH value and make the system react with heat until it turns into a transparent gel; after drying, it becomes an opaque dry glue; then it is calcined at a temperature of 1000°C to obtain a nano-ceramic powder; Sintering at ℃, the final nanocrystalline ceramics are obtained.

Description

technical field [0001] The invention relates to a preparation method of rare earth-doped strontium cerate nanocrystalline ceramics, which belongs to the technical field of inorganic ceramic material manufacturing. Background technique [0002] doped perovskite SrCeO 3 , BaCeO 3 , CaZrO 3 , SrZrO 3 , BaZrO 3 Such composite oxide ceramics have good proton conductivity in medium-high temperature hydrogen and water vapor atmospheres. These proton conductors can be used as hydrogen sensors, medium-high temperature fuel cells, hydrogen pumps, electrolytic preparation, separation and purification of hydrogen, and organic synthesis. Catalytic hydrogenation and dehydrogenation and solid electrolytes of various electrochemical devices, etc., have very important application value and broad application prospects, especially in the application of hydrogen determination in the metallurgical industry, which has the advantages of fast, simple, and low cost. Medium and high temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/624C04B35/64
Inventor 方建慧丁伟中施利毅鲁雄刚张宏力胡君蓉
Owner SHANGHAI UNIV
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