Preparation method for garnet phase nano-powder

A nano-powder and garnet-phase technology is applied in the field of improving the chemical co-precipitation method to synthesize high-sintering activity garnet-phase nano-powder, which can solve the problems of reduced sintering activity and easy agglomeration of garnet-phase nano-powder, and achieves high sintering activity. The effect of sintering activity

Inactive Publication Date: 2015-02-11
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0004] The technical purpose of the present invention is to provide an improved liquid-phase chemical co-precipitation method for the above-mentioned deficiencies in the preparation of garnet-phase nano-powders, which can improve the problems of garnet-phase nano-powders that are easy to agglomerate and reduce sintering activity. Obtain a garnet phase nanopowder with uniform dispersion and high sintering activity

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  • Preparation method for garnet phase nano-powder
  • Preparation method for garnet phase nano-powder

Examples

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Embodiment 1

[0038] In this example, the elemental molecular formula of the garnet phase nanopowder is exactly the same as that in Comparative Example 1 above. The preparation method of the powder is basically the same as that in Comparative Example 1 above, the difference is that the chemical co-precipitation process is carried out in a special reaction environment using ultrasonic waves to generate cavitation effects, that is, step (3) is as follows ;

[0039] (3) Place the container holding the precipitant solution B in the ultrasonic pool, and then add the mixed solution A to the precipitant solution B dropwise, so that the dropping process is carried out under ultrasonic vibration conditions, and during the dropping process Accompanied by vigorous mechanical stirring, the droplet velocity of the mixed liquid is 165ml / min, and the ultrasonic power is 200W; after the precipitation is complete, it is suction filtered, washed, dried, ground and sieved to obtain powder C;

[0040] The mic...

Embodiment 2

[0044] In this example, the elemental molecular formula of the garnet phase nanopowder is Ce 0.015 Gd 2.985 Al 3 Ga 2 o 12 . The preparation method of the powder is as follows:

[0045] (1) Weigh cerium carbonate, gadolinium oxide, gallium oxide, and aluminum sulfate according to the stoichiometric ratio of each element, dissolve them in nitric acid, and make a mixed solution A with a concentration of 1mol / L;

[0046] (2) Select the mixed alkali of ammonia water and ammonium bicarbonate as the precipitant, add deionized water, and make a precipitant solution B with a concentration of 1mol / L, wherein the molar ratio of ammonia water and ammonium bicarbonate is 1:1;

[0047] (3) Place the container holding the precipitant solution B in the ultrasonic pool, and then add the mixed solution A to the precipitant solution B dropwise, so that the dropping process is carried out under ultrasonic vibration conditions, and during the dropping process Accompanied by vigorous mechani...

Embodiment 3

[0050] In this embodiment, the elemental molecular formula of the garnet phase nanopowder is Pr 0.015 Gd 2.985 Al 2 Ga 3 o 12 . The preparation method of the powder is as follows:

[0051] (1) Weigh praseodymium oxide, gadolinium oxide, gallium oxide, and ammonium aluminum sulfate according to the stoichiometric ratio of each element, dissolve them in hydrochloric acid, and make a mixed solution A with a concentration of 0.3mol / L;

[0052] (2) Select the mixed alkali of ammonia water and ammonium bicarbonate as the precipitant, add deionized water, and make a precipitant solution B with a concentration of 2mol / L, wherein the molar ratio of ammonia water and ammonium bicarbonate is 1:4;

[0053] (3) Place the container holding the precipitant solution B in the ultrasonic pool, and then add the mixed solution A to the precipitant solution B dropwise, so that the dropping process is carried out under ultrasonic vibration conditions, and during the dropping process Accompani...

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Abstract

The invention provides a preparation method for garnet phase nano-powder. In a chemical coprecipitation process, the method utilizes the special reaction environment of ultrasonic cavitation effect to prepare rare earth doped garnet phase nano-powder with higher sintering activity. Compared with a common chemical coprecipitation method, the method provided by the invention can, on the one hand, promote even mixing of powder, and on the other hand can effectively avoid powder agglomeration, so that the powder obtained by calcinations at a same temperature has a higher specific surface area than powder prepared by the common coprecipitation method, and then the ceramics prepared from the powder by follow-up high-temperature sintering has higher density than ceramics prepared by the common coprecipitation method.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials, and in particular relates to an improved chemical co-precipitation method for synthesizing high sintering activity garnet phase nanopowder. Background technique [0002] Scintillation ceramics is a new type of functional ceramic material, which can absorb X, gamma and other high-energy particles or rays and convert them into visible light signals. It has a wide range of applications in medical testing, high-energy physics, safety inspection, and industrial non-destructive testing. There are many kinds of scintillating ceramics, including scintillating ceramics with isotropy and cubic garnet structure, which have good development prospects. At present, the high-end CT machine Gemstone launched by GE in the United States TM The scintillation material used in the detector is the scintillation ceramic with garnet structure. [0003] In the preparation process of ceramic materials, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/44C04B35/626
Inventor 罗朝华江浩川蒋俊
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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