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Uniform dispersion method of sintering aid and application of the sintering aid in this method

A sintering aid, uniform dispersion technology, applied in the field of dielectric materials, can solve the problems of excessive sintering aid addition, residue, uneven addition, etc., and achieve the effect of avoiding negative effects and reducing residue

Active Publication Date: 2021-07-02
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention proposes a uniform dispersion method of sintering aids and the application of the sintering aids in this method to solve the problem of uneven addition caused by the existing sintering aids addition method , and at the same time solve the problem of excessive addition of sintering aids caused by the existing method of adding sintering aids, resulting in its residue in the sintered product and affecting the performance of the material

Method used

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  • Uniform dispersion method of sintering aid and application of the sintering aid in this method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Ce oxide doped with samarium 0.8 SM 0.2 o 1.9 For example, take 1mol of Ce 0.8 SM 0.2 o 1.9 The powder is a sintered experimental sample, and by calculation, Ce 0.8 SM 0.2 o 1.9 The powder mass is 172.56g. The sintering performance of the powder without adding sintering aids is: after sintering at 1300°C for 5 hours, the relative density reaches 92%.

[0021] In order to highlight the beneficial effects of the present invention, use the technical solution proposed by the present invention to do the following operations.

[0022] (1) Take 1mol of Ce 0.8 SM 0.2 o 1.9 The powder is a sintered experimental sample, and by calculation, Ce 0.8 SM 0.2 o 1.9 The powder mass is 172.56g.

[0023] (2) Take 0.00001mol, Ba(NO 3 ) 2 As a sintering aid, dissolve in 500ml deionized water.

[0024] (3) the Ce in the above (1) 0.8 SM 0.2 o 1.9 Powder and Ba(NO in (2) 3 ) 2 The solution is mixed.

[0025] (4) Take 5g of weight (NH 4 ) 2 CO 3 , dissolved in 100ml ...

Embodiment 2

[0031] (1) Take 1 mol of Ce 0.8 Sm 0.2 O 1.9 The powder is a sintered experimental sample. By calculation, Ce 0.8 Sm 0.2 O 1.9 The powder mass was 172.56g.

[0032] (2) Take 0.00005 mol of Ba(NO) with a mass of 13.0 mg 3 ) 2 As a sintering aid, dissolved in 500ml of deionized water.

[0033] (3) Ce in the above (1) 0.8 Sm 0.2 O 1.9 Powder and Ba(NO in (2) 3 ) 2 Solution mix.

[0034] (4) Take 5g of (NH 4 ) 2 CO 3 , dissolved in 100ml of deionized water.

[0035] (5) The (NH) in the above (4) 4 ) 2 CO 3 The solution is added to the mixed system in (3), and the Ba ion reacts with carbonate to form a precipitate, which is attached to the Ce 0.8 Sm 0.2 O 1.9 surface or dispersed in Ce 0.8 Sm 0.2 O 1.9 middle of the powder. During this process, the Ba ions in the above (2) solution will be transformed from the solution phase to solid phase particles, which are uniformly dispersed in the entire system.

[0036] (6) The mixed system in the above (5) was cen...

Embodiment 3

[0040] With 0.001-0.005mol% of BaO as sintering aid, added to Ce 0.8 Sm 0.2 O 1.9 Among them, the following data are obtained through experiments, indicating that the use of the BaO sintering aid of 0.001-0.005 mol% disclosed in the present invention can improve the sintering performance of the doped ceria material, Ce 0.8 Sm 0.2 O 1.9 The sintering temperature was lowered by 100 °C.

[0041]

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Abstract

The invention belongs to the technical field of dielectric materials, and discloses a method for uniformly dispersing sintering aids, including Ba(NO 3 ) 2 The solution is mixed with the ceramic powder, and the mixed Ba(NO 3 ) 2 Add an alkaline precipitant solution to the solution to cause a precipitation reaction, and the Ba salt precipitate formed by the reaction is directly attached to the surface of the ceramic powder; Separation until all solid matter is concentrated in the lower part of the centrifuge tube; finally, dry the solid matter to achieve a uniform distribution of the Ba salt precipitate in the ceramic powder. The invention also discloses the use of the sintering aid with a Ba content of 0.001-0.005 mol%. The method of the invention can uniformly add the sintering aid, and at the same time play a sintering aiding role, reduce the residue of the sintering aid in the ceramic powder, and effectively avoid adverse effects on the performance of the ceramic powder.

Description

technical field [0001] The invention belongs to the technical field of dielectric materials, and relates to a sintering aid, especially a method for uniformly dispersing the sintering aid and the application of the sintering aid in this method, and discloses the restriction on the content of the sintering aid and the addition of the sintering aid to the method of doping cerium oxide. Background technique [0002] Doped ceria is a type of solid electrolyte material used in fuel cells and other fields, and its representatives include samarium-doped ceria and gadolinium-doped ceria. The sintering performance of doped cerium oxide is poor. In order to reduce its sintering temperature and obtain high sintering density at a lower temperature, sintering aids can often be added to it. [0003] Generally used sintering aids are CuO, CoO, Li 2 O et al. (Journal of Power Sources. (2006) 162(1): 480-485.) (Ceramics International. (2016) 42(9): 11170-11176.). The method of adding the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/64
CPCC04B35/64C04B2235/6567
Inventor 李海滨李宝光戴欢李鹏李阳王鹏闫真
Owner YUNNAN UNIV
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