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Preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramic

A technology of transparent ceramics and dysprosium oxide, which is applied in the field of preparation of optical-grade dysprosium oxide magneto-optical transparent ceramics, can solve the problems of complex preparation process, long preparation cycle, low transmittance, etc., and achieve simple preparation process, low cost, sintering active effect

Inactive Publication Date: 2021-11-23
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the produced dysprosium oxide magneto-optical transparent ceramics have low transmittance in the visible light band, complex preparation process, long preparation cycle and high cost

Method used

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  • Preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramic
  • Preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramic
  • Preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramic

Examples

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Effect test

Embodiment 1

[0023] A preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramics, the specific steps are:

[0024] (1) The synthesis of dysprosium oxide nanocrystalline powder includes: configuring Dy(NO 3 ) 3 Rare earth solution, add 5at.%La(NO 3 ) 3 Mix well; use the positive drop method to drip the precipitant solution (the molar ratio of ammonia water: ammonium bicarbonate is 1:5) into 5at.%La:Dy(NO 3 ) 3 In the mother liquor and continue to stir until the pH value of the precipitation solution reaches a fixed value, stop titration and stirring;

[0025] (2) aging the precipitated solution for 4-12h;

[0026] (3) Washing, drying, and sieving the sample obtained in step (2) in sequence, and calcining in a muffle furnace at 900° C. for 2 h to obtain nanopowder.

[0027] (4) Dry pressing and cold isostatic pressing of the nano-powder in step (3) to obtain a ceramic green body; placing the green body in a high-temperature atmosphere furnace for sinterin...

Embodiment 2

[0031] A preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramics, the specific steps are:

[0032] (1) The synthesis of dysprosium oxide nanocrystalline powder includes: configuring Dy(NO 3 ) 3 Rare earth solution, add 5at.%La(NO 3 ) 3 Mix well; use the positive drop method to drip the precipitant solution (the molar ratio of ammonia water: ammonium bicarbonate is 1:5) into 5at.%La:Dy(NO 3 ) 3 In the mother liquor and continue to stir until the pH value of the precipitation solution reaches a fixed value, stop titration and stirring;

[0033] (2) aging the precipitated solution for 4-12h;

[0034] (3) Washing, drying, and sieving the sample obtained in step (2) in sequence, and calcining in a muffle furnace at 1000° C. for 2 h to obtain nanopowder.

[0035] (4) Dry pressing and cold isostatic pressing of the nano-powder in step (3) to obtain a ceramic green body; placing the green body in a high-temperature atmosphere furnace for sinteri...

Embodiment 3

[0039] A preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramics, the specific steps are:

[0040] (1) The synthesis of dysprosium oxide nanocrystalline powder includes: configuring Dy(NO 3 ) 3 Rare earth solution, add 5at.%La(NO 3 ) 3 Mix well; use the positive drop method to drip the precipitant solution (the molar ratio of ammonia water: ammonium bicarbonate is 1:5) into 5at.%La:Dy(NO 3 ) 3 In the mother liquor and continue to stir until the pH value of the precipitation solution reaches a fixed value, stop titration and stirring;

[0041] (2) aging the precipitated solution for 4-12h;

[0042] (3) After washing, drying and sieving the samples obtained in step (2), they were calcined in a muffle furnace at 1100° C. for 2 hours to obtain nanopowders.

[0043] (4) Dry pressing and cold isostatic pressing of the nano-powder in step (3) to obtain a ceramic green body; placing the green body in a high-temperature atmosphere furnace for sinte...

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Abstract

The invention belongs to the technical field of preparation of transparent ceramics, and particularly discloses a preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramics, wherein the preparation method comprises the following steps: (1) synthesis of dysprosium oxide nanocrystalline powder: preparing a Dy(NO3)3 rare earth solution with specific concentration and pH value, adding 5 at.% La(NO3)3, and uniformly mixing; and dropwise adding a precipitant solution into a mother solution, continuously stirring, and stopping titration and stirring until the pH value of the precipitant solution reaches a fixed value; (2) aging the obtained precipitation solution for a fixed time to obtain a colloidal precipitate; (3) carrying out post-treatment on the precipitate obtained in the step (2), and calcining in a muffle furnace; and (4) carrying out dry pressing molding and cold isostatic pressing on the nano-powder in the step (3) at one time to obtain a ceramic body; and sintering in a pressureless sintering furnace with reducing gas to obtain the dysprosium oxide magneto-optical transparent ceramic. The preparation method is mainly used for preparing the dysprosium oxide magneto-optical transparent ceramic, and the problems that in the prior art, a magneto-optical ceramic is poor in transparency at the low wave band, and the production process is complex are solved.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramics, and specifically discloses a preparation method of optical-grade dysprosium oxide magneto-optical transparent ceramics. Background technique [0002] Generally, ceramics are opaque, but transparent ceramics have a certain degree of light transmission, so they are called transparent ceramics. Generally, the reason why ceramics are opaque is that there are impurities and pores inside. The former can absorb light, and the latter can scatter light, so it is opaque. Therefore, it is possible to obtain transparent ceramics if high-purity raw materials are selected and pores are eliminated through technological means. In the early days, this method was used to obtain transparent alumina ceramics. Later, various oxide series transparent ceramics such as sintered white corundum, magnesia, beryllium oxide, yttrium oxide, and yttrium oxide-zirconia were successively developed. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/626C04B35/64
CPCC04B35/50C04B35/622C04B35/626C04B35/64C04B2235/9653C04B2235/3227C04B2235/668C04B2235/6582C04B2235/96
Inventor 周鼎徐家跃
Owner SHANGHAI INST OF TECH
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