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Preparation method of nanometer aluminum oxide/ gadolinium-aluminum perovskite composite powder

A nano-alumina and composite powder technology, which is applied in the field of preparation of nano-alumina/gadolinium aluminate composite powder, can solve the problem that the sol-gel method is not suitable for large-scale synthesis, the combustion synthesis method reacts quickly and is difficult to control, and the equipment Require high-level problems, achieve the effect of low production cost, simple preparation method, and no environmental pollution

Inactive Publication Date: 2015-04-08
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

These methods have their own advantages and disadvantages. The synthesis temperature of the high-temperature solid-phase method is relatively high. The sol-gel method is not suitable for large-scale synthesis and has high cost. high

Method used

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  • Preparation method of nanometer aluminum oxide/ gadolinium-aluminum perovskite composite powder
  • Preparation method of nanometer aluminum oxide/ gadolinium-aluminum perovskite composite powder
  • Preparation method of nanometer aluminum oxide/ gadolinium-aluminum perovskite composite powder

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specific Embodiment approach 1

[0019] Specific implementation mode 1: This implementation mode is a preparation method of nano-alumina / gadolinium aluminate composite powder, which is specifically carried out according to the following steps:

[0020] 1. Preparation of gadolinium nitrate solution: dissolve gadolinium oxide in concentrated nitric acid, and heat at a temperature of 20°C to 120°C until gadolinium oxide is completely dissolved to obtain a gadolinium nitrate solution; the quality of the gadolinium oxide is the same as that of concentrated nitric acid The volume ratio is 1g:(1mL~27.6mL);

[0021] Two, prepare aluminum nitrate solution: aluminum nitrate nonahydrate is dissolved in distilled water, obtain aluminum nitrate solution; The quality of described aluminum nitrate nonahydrate and the volume ratio of distilled water are 1g: (1.33mL~26.66mL);

[0022] 3. Co-precipitation: uniformly mix the gadolinium nitrate solution prepared in step 1 and the aluminum nitrate solution prepared in step 2 to o...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that: the mass fraction of concentrated nitric acid described in step 1 is 65% to 68%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: this embodiment is different from one of specific embodiments one to two in that: the mass of gadolinium oxide described in step one and the volume ratio of concentrated nitric acid are 1g:(3mL~15mL). Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention relates to a preparation method of nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder, and aims at solving the technical problems that an existing preparation method of Al2O3 / GdAlO3 composite powder is high in synthetic temperature, not suitable for large scale synthesis and high in cost, and difficultly controls a quick reaction. The preparation method of the nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder includes: 1, preparing a gadolinium nitrate solution; 2, preparing an aluminum nitrate solution; 3, precipitating the gadolinium nitrate solution and the aluminum nitrate solution together; 4, centrifuging and drying the gadolinium nitrate solution and the aluminum nitrate solution after the gadolinium nitrate solution and the aluminum nitrate solution are precipitated together; 5, performing roasting. The preparation method of the nanometer aluminum oxide / gadolinium-aluminum perovskite composite powder has the advantages of using an alcohol-water heating method according to the principle that an electric medium constant of an alcohol-water solution is obviously reduced and ultrafine particles which are evenly dispersed are easy to form, is performed under mild conditions easy to control, can adapt to different aluminum oxide / gadolinium-aluminum perovskite composite powder systems, and simultaneously can control two phases of compositions, is low in production cost and simple, can not cause pollution on environment, can prepare the nanometer composite powder good in dispersion performance, and can achieve large scale volume production.

Description

technical field [0001] The invention relates to a preparation method of nano alumina / gadolinium aluminate composite powder. Background technique [0002] In recent years, with the rapid development of aerospace technology, the demand for increasing the inlet temperature of aeroengine turbines and the thermal efficiency of gas turbines has become increasingly urgent. High-temperature structural materials represented by alumina-based nanocomposite ceramics have high strength, high toughness, Excellent service performance such as oxidation resistance and superplastic deformation, among which Al 2 o 3 / GdAlO 3 Nano-composite ceramics are expected to become a new generation of structural materials that can serve for a long time in high-temperature oxidizing atmospheres. Due to the close relationship between their structure and performance and the particle size and uniformity of raw material powders, the preparation of uniform and fine-grained ceramics al 2 o 3 / GdAlO 3 The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/44C04B35/622
Inventor 欧阳家虎马永辉王玉金刘占国
Owner HARBIN INST OF TECH
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