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Dysprosium-doped hexagonal yttrium aluminate ceramic powder and preparation method thereof

A technology of ceramic powder and yttrium aluminate, which is applied in the field of dysprosium-doped hexagonal yttrium aluminate ceramic powder and its preparation, can solve the problems of long reaction time, difficulty in obtaining YAH powder, slow heating and cooling rate, and achieve good The effect of sintering activity

Inactive Publication Date: 2015-06-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these studies often use the traditional heating method, the heating and cooling rate is slow, the reaction time is long, the powder obtained is a mixed phase of YAH and YAG, it is difficult to obtain a pure phase of YAH powder, and YAH doped with rare earths is rarely reported.

Method used

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  • Dysprosium-doped hexagonal yttrium aluminate ceramic powder and preparation method thereof
  • Dysprosium-doped hexagonal yttrium aluminate ceramic powder and preparation method thereof
  • Dysprosium-doped hexagonal yttrium aluminate ceramic powder and preparation method thereof

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Embodiment 1

[0032] A kind of preparation method of dysprosium doped hexagonal yttrium aluminate ceramic powder, is characterized in that, comprises the following steps:

[0033](1) Dysprosium nitrate pentahydrate, yttrium nitrate hexahydrate, aluminum nitrate nonahydrate and citric acid monohydrate are mixed according to the molar ratio of 0.5%:3 (1-0.5%):5:4, dissolved in deionized water, and added Ammonia water was used to adjust the pH to 1, and after fully stirring, the water was evaporated and dried to obtain a xerogel; the xerogel was heat-treated at 700°C in a muffle furnace, and the precursor powder was obtained after ball milling and drying;

[0034] (2) Place the precursor powder in a graphite reactor, place the graphite reactor in a high-current reaction device (discharge plasma sintering equipment), keep the atmosphere in the graphite reactor as a non-oxidizing atmosphere, and apply a pulse current to the graphite reactor , so that it was heated to a temperature of 800°C at a ...

Embodiment 2

[0038] A kind of preparation method of dysprosium doped hexagonal yttrium aluminate ceramic powder, is characterized in that, comprises the following steps:

[0039] (1) Dysprosium nitrate pentahydrate, yttrium nitrate hexahydrate, aluminum nitrate nonahydrate and citric acid monohydrate are mixed according to the molar ratio of 2%:3 (1-2%):5:4, dissolved in deionized water, and added Ammonia water was used to adjust the pH to 1.5. After fully stirring, the water was evaporated and dried to obtain a xerogel; the xerogel was heat-treated at 740°C in a muffle furnace, and the precursor powder was obtained after ball milling and drying;

[0040] (2) Place the precursor powder in a graphite reactor, place the graphite reactor in a high-current reaction device (discharge plasma sintering equipment), keep the atmosphere in the graphite reactor as a non-oxidizing atmosphere, and apply a pulse current to the graphite reactor , so that it was heated to a temperature of 840°C at a heati...

Embodiment 3

[0044] A kind of preparation method of dysprosium doped hexagonal yttrium aluminate ceramic powder, is characterized in that, comprises the following steps:

[0045] (1) Dysprosium nitrate pentahydrate, yttrium nitrate hexahydrate, aluminum nitrate nonahydrate and citric acid monohydrate are mixed according to the molar ratio of 4%:3 (1-4%):5:4, dissolved in deionized water, and added Ammonia water was used to adjust the pH to 2. After fully stirring, the water was evaporated and dried to obtain a xerogel; the xerogel was heat-treated at 720°C in a muffle furnace, and the precursor powder was obtained after ball milling and drying;

[0046] (2) Place the precursor powder in a graphite reactor, place the graphite reactor in a high-current reaction device (discharge plasma sintering equipment), keep the atmosphere in the graphite reactor as a non-oxidizing atmosphere, and apply a pulse current to the graphite reactor , so that it was heated to a temperature of 810°C at a heating...

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Abstract

The invention belongs to the technical field of preparation of ceramic materials, and particularly relates to a dysprosium-doped hexagonal yttrium aluminate ceramic powder and a preparation method thereof. The preparation method comprises the following steps: mixing dysprosium nitrate pentahydrate, yttrium nitrate hexahydrate, aluminum nitrate nonahydrate and citric acid monohydrate, dissolving in deionized water, adding ammonia water to regulate the pH value to 1-2, sufficiently stirring, evaporating water, and drying to obtain xerogel; carrying out heat treatment, ball milling and drying on the xerogel to obtain a precursor powder; and (2) putting the precursor powder into a graphite reactor, sintering in a discharge plasma sintering unit, cooling to room temperature after finishing sintering, and grinding to obtain the dysprosium-doped hexagonal yttrium aluminate ceramic powder. The method can obtain the Dy:YAH powder with uniform and small particle size of which the crystalline phase is single-phase YAH. The Dy:YAH powder has favorable sintering activity, and can be used for preparing fine-crystalline Dy:YAH powder or Dy:YAH ceramic at low temperature.

Description

technical field [0001] The invention belongs to the technical field of preparation of ceramic materials, and in particular relates to a dysprosium-doped hexagonal yttrium aluminate ceramic powder and a preparation method thereof. Background technique [0002] Y 2 o 3 -Al 2 o 3 Systematic materials have been extensively studied due to their excellent optical properties. Y 2 o 3 -Al 2 o 3 System materials include YAlO 3 (hexagonal YAH or orthorhombic YAP), Y 3 Al 5 o 12 (cubic YAG) and Y 4 Al 2 o 9 (Monoclinic YAM). [0003] The chemical formula of yttrium aluminum garnet (Yttrium aluminum garnet, YAG) is Y 3 Al 5 o 12 , with a melting point of 1950°C, belongs to the cubic crystal system, and has a garnet structure. YAG ceramics have good thermal stability and chemical stability, and can be used as high-temperature structural materials. Yttrium aluminum garnet is optically isotropic because of its centrosymmetric cubic crystal structure, and its theoretical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/622
Inventor 王玉成张威傅正义王为民王皓张金咏张帆王蓉蓉
Owner WUHAN UNIV OF TECH
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