Method for preparing yttrium aluminum garnet powder

A technology of yttrium aluminum garnet and garnet powder, which is applied in the field of polycrystalline ceramic powder preparation, can solve problems such as difficulty in obtaining yttrium aluminum garnet polycrystalline powder, difficulty in obtaining uniformly dispersed YAG powder, and affecting the purity of YAG products. , to achieve the effect of uniform composition, less pollution and less consumption of raw materials

Active Publication Date: 2020-08-25
PUTIAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, there are also some obvious disadvantages in the preparation of polycrystalline YAG powder by co-precipitation: (1) it is difficult to form a precursor powder with precise stoichiometric ratio and uniform composition due to the difference in solubility product and sedimentation rate; (2) it is difficult to control Proper pH makes Y +3 、Al +3 Complete precipitation at the same time; (3) The drying and roasting process may lead to the formation of particle agglomeration, making it difficult to obtain a uniformly dispersed YAG powder; (4) The use of precipitants such as ammonia water, urea, ammonium carbonate and ammonium bicarbonate will inevitably lead to final The product is mixed with impurity elements such as N or C, which affects the purity of the obtained YAG product; (5) The filtration and washing process of the precipitated precursor will inevitably cause the loss of metal ions, and it is difficult to obtain high-purity, accurate stoichiometric yttrium aluminum garnet Polycrystalline powder

Method used

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  • Method for preparing yttrium aluminum garnet powder

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Experimental program
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Effect test

Embodiment l

[0026] (1) Reaction raw material Y(NO 3 ) 3 ·6H 2 O and aluminum isopropoxide were thoroughly dried at 160°C. According to chemical formula Y 3 Al 5 o 12 , Weighed 10.814g yttrium nitrate hexahydrate, 9.600g aluminum isopropoxide and 0.6g NaOH respectively.

[0027] (2) Dissolve the weighed yttrium nitrate hexahydrate in 30ml of deionized water, dissolve NaOH in 30ml of deionized water, and dissolve aluminum isopropoxide in 20ml of absolute ethanol to prepare corresponding solutions.

[0028] (3) At room temperature, slowly add the NaOH solution dropwise into the yttrium nitrate solution while stirring until the pH value of the solution becomes 12, then stop the titration to obtain a suspension of the yttrium hydroxide precipitation precursor.

[0029] (4) Centrifuge the obtained precipitation precursor suspension at high speed, slowly suck out the supernatant with a syringe or a straw, then add deionized water to wash the lower filter cake, and then centrifuge and wash ...

Embodiment 2

[0036] (1) Reaction raw material Y(NO 3 ) 3 ·6H 2 O and aluminum isopropoxide were thoroughly dried at 140°C. According to chemical formula Y 3 Al 5 o 12 , respectively weighed 5.632g of yttrium nitrate hexahydrate, 5g of aluminum isopropoxide and 0.3g of NaOH.

[0037] (2) Dissolve the weighed yttrium nitrate hexahydrate in 15ml of deionized water, dissolve NaOH in 30ml of deionized water, and dissolve aluminum isopropoxide in 25ml of absolute ethanol to prepare corresponding solutions.

[0038] (3) At room temperature, slowly add the NaOH solution dropwise into the yttrium nitrate solution while stirring until the pH value of the solution becomes 12, then stop the titration to obtain a suspension of the yttrium hydroxide precipitation precursor.

[0039] (4) Centrifuge the obtained precipitation precursor suspension at high speed, slowly suck out the supernatant with a syringe or a straw, then add deionized water to wash the lower filter cake, and then centrifuge and was...

Embodiment 3

[0045] (1) Reaction raw material Y(NO 3 ) 3 ·6H 2 O and aluminum isopropoxide were thoroughly dried at 120°C. According to chemical formula Y 3 al 5 o 12 , respectively weighed 4.055g of yttrium nitrate hexahydrate, 3.600g of aluminum isopropoxide and 0.6g of NaOH.

[0046] (2) Dissolve the weighed yttrium nitrate hexahydrate in 20ml of deionized water, dissolve NaOH in 30ml of deionized water, and dissolve aluminum isopropoxide in 20ml of absolute ethanol to prepare corresponding solutions.

[0047] (3) At room temperature, slowly add the NaOH solution dropwise into the yttrium nitrate solution while stirring until the pH value of the solution becomes 12, then stop the titration to obtain a suspension of the yttrium hydroxide precipitation precursor.

[0048] (4) Centrifuge the obtained precipitation precursor suspension at high speed, slowly suck out the supernatant with a syringe or a straw, then add deionized water to wash the lower filter cake, and then centrifuge a...

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Abstract

The invention discloses a method for preparing yttrium aluminum garnet powder. The chemical formula of yttrium aluminum garnet is Y3Al5O12. The preparation method comprises the steps of solution preparation, precipitation, washing, mixing, hydrolysis, hydrothermal reaction, filtration, drying and calcination. The prepared yttrium aluminum garnet polycrystalline powder has the advantages of high purity, accurate stoichiometric ratio, uniform composition and uniform dispersion.

Description

technical field [0001] The invention belongs to the technical field of polycrystalline ceramic powder preparation, and in particular relates to a method for preparing yttrium aluminum garnet powder. Background technique [0002] Yttrium aluminum garnet (yttrium aluminum garnet, Y 3 Al 5 o 12 , YAG) is a cubic system with a lattice parameter of 1.2nm. YAG crystal is an important laser matrix material, and Nd-doped YAG (Nd:YAG) crystal is widely used in high-power lasers. [0003] At present, the synthesis method of YAG is mainly high-temperature solid-phase method, that is, the polycrystalline material of YAG is prepared by the method of solid-state reaction of component oxides. The synthesis of YAG polycrystalline material by solid-state reaction requires high reaction temperature and long reaction time, and it is difficult to achieve uniform chemical composition by ball milling and mixing, and it is easy to introduce impurity phases. In addition, there are also reports...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/44C04B35/626C01F17/34
CPCC04B35/44C04B35/626C01F17/34C04B2235/3225
Inventor 李先学陈彰旭郑炳云
Owner PUTIAN UNIV
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