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A method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology

A powder material, a technology of gadolinium aluminate, which is applied in the field of preparing whisker-like gadolinium aluminate powder materials by hydrothermal technology, can solve the problems of difficult reaction control, uneven particle size, high preparation cost, and achieve high thermal shock resistance. factor, high thermal conductivity, and the effect of short preparation cycles

Active Publication Date: 2021-02-12
YINGKOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solid phase method is easy to cause uneven particle size and crystal formation defects; the sol-gel method has high preparation costs and difficult to control the reaction

Method used

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  • A method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology
  • A method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology
  • A method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of whisker-like GdAlO by a hydrothermal technique 3 The method for powder material, comprises the steps:

[0033] (1) will Gd 2 o 3 Gd (NO 3 ) 3 solution, and stir thoroughly;

[0034] (2) will be related to the Gd 2 o 3 Equimolar Al 2 o 3 Al(NO 3 ) 3 solution;

[0035] (3) Gd (NO 3 ) 3 and Al (NO 3 ) 3 Mix the solutions to make a rare earth solution with a total cation concentration of 0.2mol / L, wherein the molar ratio of gadolinium ions to aluminum ions is 1:1;

[0036] (3) Using ammonia water as a mineralizer, adjusting the pH of the rare earth solution to 9 to obtain a rare earth solution with white flocculent precipitates;

[0037] (4) Move the solution (3) into a polytetrafluoroethylene-lined autoclave, react at 180°C for 18 hours, cool to room temperature, and filter to obtain the precursor;

[0038] (5) Wash the precursor twice with deionized water to remove excess impurity ions;

[0039] (6) Put the cleaned precursor in a vacuum dr...

Embodiment 2

[0043] Preparation of whisker-like GdAlO by a hydrothermal technique 3 The method for powder material, comprises the steps:

[0044] (1) will Gd 2 o 3 Gd (NO 3 ) 3 solution, and stir thoroughly;

[0045] (2) Equimolar Al 2 o 3 Al(NO 3 ) 3solution, Gd(NO 3 ) 3 and Al (NO 3 ) 3 Mix the solutions to make a rare earth solution with a total cation concentration of 0.3mol / L, wherein the molar ratio of gadolinium ions to aluminum ions is 1:1;

[0046] (3) Using ammonia water as a mineralizer, adjusting the pH of the rare earth solution to 10 to obtain a rare earth solution with white flocculent precipitates;

[0047] (4) Move the solution (3) into a high-pressure reactor with a polytetrafluoroethylene liner, react at 150°C for 20 hours, cool to room temperature, and filter to obtain the precursor;

[0048] (5) Wash the precursor twice with deionized water to remove excess impurity ions;

[0049] (6) Put the cleaned precursor in a vacuum drying oven and dry it at 120 °C...

Embodiment 3

[0053] Preparation of whisker-like GdAlO by a hydrothermal technique 3 The method for powder material, comprises the steps:

[0054] (1) will Gd 2 o 3 Gd (NO 3 ) 3 solution, and stir thoroughly;

[0055] (2) Equimolar Al 2 o 3 Al(NO 3 ) 3 solution, Gd(NO 3 ) 3 and Al (NO 3 ) 3 Mix the solutions to make a rare earth solution with a total cation concentration of 0.4mol / L, wherein the molar ratio of gadolinium ions to aluminum ions is 1:1;

[0056] (3) Using ammonia water as a mineralizer, adjusting the pH of the rare earth solution to 10 to obtain a rare earth solution with white flocculent precipitates;

[0057] (4) Transfer the solution (3) into a polytetrafluoroethylene-lined autoclave, react at 200°C for 20 h, cool to room temperature, and filter to obtain the precursor;

[0058] (5) Wash the precursor twice with deionized water to remove excess impurity ions;

[0059] (6) Put the cleaned precursor in a vacuum drying oven and dry it at 100 °C for 24 h;

[006...

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Abstract

The invention provides a method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology, including the configuration of rare earth solution, preparation of precursor, drying of precursor and calcination process: mixing gadolinium ion solution and aluminum ion solution to prepare Rare earth solution, use ammonia water as a mineralizer to adjust the pH value, then react in a high-pressure reactor for a period of time to obtain a precursor, wash the precursor twice, dry, grind after drying, and then calcinate at a certain temperature for a certain period of time to obtain GdAlO 3 Powder. The invention provides a hydrothermal synthesis method for preparing GdAlO 3 The method of powder material, the method is simple, the prepared powder crystal is whisker-like, has the advantages of high purity, less impurities, uniform size, small size, anisotropy, etc. It has broad prospects in the practical application of related functional materials such as body and light-emitting matrix materials.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a method for preparing whisker-shaped gadolinium aluminate powder material by hydrothermal technology. Background technique [0002] Gadolinium aluminate (GdAlO 3 ) is an orthorhombic perovskite structure with excellent optical properties, mechanical properties and stable physical and chemical properties. Its application as a new type of optical matrix material and composite reinforcement material is attracting people's attention. Literature report: GdAlO with the best luminescent properties prepared under certain conditions by citric acid sol-gel-combustion method 3 : Eu 3+ Luminescent powder; GdAlO 3 / Al 2 o 3 Nanocomposite ceramics can improve high brittleness and low thermal shock. Due to GdAlO 3 There is a close relationship between material properties and microstructure, exploring GdAlO 3 The nano-powder regulation process is particularly cr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/62C30B29/24C30B7/10
CPCC30B7/105C30B29/24C30B29/62
Inventor 齐鹏远戴时雨李晶马伟民伊人杰
Owner YINGKOU INST OF TECH