Method for preparing Gd2Zr2O7 nano-powder sol with sol-gel method

A sol-gel method, nano-powder technology, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of missing nano-powder materials, and achieve short preparation period, simple raw materials, and good dispersibility. Effect

Inactive Publication Date: 2012-06-20
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

Gd 2 Zr 2 o 7 The preparation of nanopowders has been reported in many literatures by co-precipitation and solid-state reaction

Method used

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  • Method for preparing Gd2Zr2O7 nano-powder sol with sol-gel method
  • Method for preparing Gd2Zr2O7 nano-powder sol with sol-gel method
  • Method for preparing Gd2Zr2O7 nano-powder sol with sol-gel method

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Embodiment

[0025] According to the preparation process, accurately weigh 0.529g, ZrOCl 2 ﹒ 8H 2 Dissolve O in 15ml of distilled water, add 5.5ml of ammonia water dropwise, stir well to obtain a white colloidal precipitate, filter the precipitate, and wash it with dedistilled water several times to remove Cl - , dissolve the precipitate in 30ml, 0.05mol / L dilute nitric acid, stir to obtain ZrO(NO 3 ) 2 solution. Add 0.529g, Gd 2 o 3 Dissolve in 30ml, 0.05mol / L dilute nitric acid solution to form Gd(NO 3 ) 3 solution, and with ZrO(NO 3 ) 2 The solution is mixed. Add 1.328g of citric acid to the mixture, stir to dissolve, add 5.37ml of ethylene glycol, adjust the pH of the system to 2 with concentrated ammonia water while stirring continuously, add 7ml of absolute ethanol, heat and evaporate in a water bath at 80°C 24h to form a transparent gel. The gel was dried in a drying oven at 120° C. to form a gray-brown fluffy and porous xerogel. The xerogel was ground and sieved and th...

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Abstract

A method for preparing Gd2Zr2O7 nano-powder sol with a sol-gel method relates to a method for preparing nano-powder and comprises preparing, gelling and drying of original rare earth solution and a roasting process of dried gel. ZrOC12.8H2O and Gd2O3 are respectively prepared to be nitrate solution, after even mixing, chelant citric acid is added, and ethylene glycol is also added. On the condition of continuous mixing, the potential of hydrogen (pH) value of the system is adjusted by means of stronger ammonia water, absolute ethyl alcohol is added, and then the solution is heated in water bath to enable the solution to form vitreosol and gel. The dried gel is obtained by drying the gel, and after grinding, the dried gel is roasted for two hours to obtain the Gd2Zr2O7 nano-powder. The method is simple in process, the adopted raw materials are simple to obtain and less in loss, the method has short preparation period, the Gd2Zr2O7 nano-powder is small in grain size and even in distribution, is basically in the spherical shape, and has broad prospects when applied to the thermal barrier coating field and the high-radioactivity waste solidification field.

Description

technical field [0001] The invention relates to a method for preparing nano powder, in particular to a sol-gel method for preparing Gd 2 Zr 2 o 7 nanopowder method. Background technique [0002] Gd 2 Zr 2 o 7 The material has physical and chemical properties such as high melting point, thermal expansion coefficient, chemical stability, radiation resistance and thermal stability, and low thermal conductivity, so it can be widely used in the field of thermal barrier coatings and solidified high-level radioactive waste. In the field of thermal barrier coatings, it can replace the 6wt%~8wt% yttria-stabilized zirconia (YSZ) widely used ceramic heat insulation surface material at present, which can increase the service temperature and prolong the service life of thermal barrier coatings; in radiation protection Materials field, Gd 2 Zr 2 o 7 Compared with the currently recognized second-generation solidified high-level radioactive waste titanate-based ceramics, it is supe...

Claims

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Application Information

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IPC IPC(8): C01G25/00B82Y40/00
Inventor 马伟民马雷孙旭东李权赵翔张倩
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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