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Method for preparing dysprosium oxide transparent ceramic

A technology of transparent ceramics and dysprosium oxide, which is applied in the field of preparation of dysprosium oxide transparent ceramics, can solve the problems of unfavorable transparent ceramics, and achieve the effects of simple operation, high application value and low preparation cost

Active Publication Date: 2017-04-26
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The layered rare earth compound was studied, and it was found that the thermal decomposition temperature of the oxide formed by the two-dimensional nanosheet of the layered rare earth compound of nitrate is low, but the fragmentation of the two-dimensional nanosheet needs a higher temperature, and the result is high temperature. The oxide powder produced after calcination has a serious agglomeration phenomenon, which is extremely unfavorable for the preparation of transparent ceramics with high transmittance

Method used

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  • Method for preparing dysprosium oxide transparent ceramic
  • Method for preparing dysprosium oxide transparent ceramic
  • Method for preparing dysprosium oxide transparent ceramic

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The method for preparing dysprosium oxide transparent ceramics proposed in this embodiment includes the following steps:

[0027] ① Dissolve dysprosium nitrate in water to prepare a dysprosium nitrate solution with a concentration of 0.25 mol / L, and dissolve naphthol yellow sulfur in water to prepare a naphthol yellow sulfur solution with a concentration of 1 mol / L.

[0028] ②At a temperature of 30℃, add ammonia water with a concentration of 1mol / L to the dysprosium nitrate solution dropwise at a rate of 10mL / min, and make the pH value of the end point of the titration 10, and continue to age for 5h after the end of the titration After aging, a white precipitate is obtained.

[0029] Here, the amount of ammonia added is controlled by a metering pump or a separating funnel.

[0030] ③ Filter and wash the white precipitate, and then add the filtered and washed white precipitate to the naphthol yellow sulfur solution to react for 5 hours. After the reaction is completed, a layered...

Embodiment 2

[0036] The method for preparing dysprosium oxide transparent ceramics proposed in this embodiment includes the following steps:

[0037] ① Dissolve dysprosium nitrate in water to prepare a dysprosium nitrate solution with a concentration of 0.02mol / L, and dissolve naphthol yellow sulfur in water to prepare a naphthol yellow sulfur solution with a concentration of 0.002mol / L.

[0038] ②At a temperature of 0℃, add ammonia water with a concentration of 1mol / L to the dysprosium nitrate solution dropwise at a rate of 5mL / min, and make the pH value of the end point of the titration 7.5, and continue aging for 1h after the end of the titration After aging, a white precipitate is obtained.

[0039] Here, the amount of ammonia added is controlled by a metering pump or a separating funnel.

[0040] ③ Filter and wash the white precipitate, and then add the filtered and washed white precipitate to the naphthol yellow sulfur solution to react for 1 hour. After the reaction is completed, a layered ...

Embodiment 3

[0046] The method for preparing dysprosium oxide transparent ceramics proposed in this embodiment includes the following steps:

[0047] ① Dissolve dysprosium nitrate in water to prepare a dysprosium nitrate solution with a concentration of 0.05 mol / L, and dissolve naphthol yellow sulfur in water to prepare a naphthol yellow sulfur solution with a concentration of 0.01 mol / L.

[0048] ②At a temperature of 4℃, add ammonia water with a concentration of 1mol / L to the dysprosium nitrate solution dropwise at a rate of 3mL / min, and make the pH value of the end point of the titration 9, and continue to age for 1h after the end of the titration After aging, a white precipitate is obtained.

[0049] Here, the amount of ammonia added is controlled by a metering pump or a separating funnel.

[0050] ③ Filter and wash the white precipitate, and then add the filtered and washed white precipitate to the naphthol yellow sulfur solution to react for 2 hours. After the reaction is completed, a layered...

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Abstract

The invention discloses a method for preparing a dysprosium oxide transparent ceramic, the method is as follows: first, adding ammonia drop by drop into a dysprosium nitrate solution, and after the completion of the titration, aging to obtain a white precipitate; adding the filtered and washed white precipitate into a naphthol yellow sulphur solution for reaction to obtain a layered rare earth compound precursor containing naphthol yellow sulphur ion groups; in turn washing, drying, grinding, sieving and sintering the layered rare earth compound precursor containing the naphthol yellow sulphur ion groups to obtain dysprosium oxide nano powder; and finally, in turn performing pre pressing, cold isostatic compaction, high temperature pressureless sintering and machining on the dysprosium oxide nano powder to obtain the dysprosium oxide transparent ceramic. Advantages of method are that the obtained dysprosium oxide nano powder has high sintering activity, and is free of serious aggregation, the dysprosium oxide transparent ceramic can be prepared by the pressureless sintering technology, and the dysprosium oxide transparent ceramic with high transmittance also can be prepared by the pressureless sintering technology.

Description

Technical field [0001] The invention relates to a preparation technology of oxide transparent ceramics, in particular to a preparation method of dysprosium oxide transparent ceramics. Background technique [0002] The European Patent Publication No. EP1336596 discloses a method for preparing rare earth oxide transparent ceramics, which first obtains high-purity rare earth oxide powder, wherein the average size of the rare earth oxide powder is 2-20 μm; and then sinters the rare earth oxide The powder made of rare earth oxide transparent ceramics. The preparation method does not disclose the synthesis method of rare earth oxide powder. [0003] At present, transparent ceramics are usually prepared by pressureless sintering (such as vacuum sintering, atmosphere sintering, etc.) or pressure-assisted sintering (such as hot pressing sintering, hot isostatic pressing sintering, etc.). Compared with pressure-assisted sintering, pressureless sintering has the advantages of low cost, time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/626
CPCC04B35/50C04B35/626C04B2235/656C04B2235/658C04B2235/6581C04B2235/9653
Inventor 吕滨陈红兵潘建国姜林文潘尚可
Owner NINGBO UNIV
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