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In situ synthesis method for Gd2Zr2O7/ZrO2(3Y) nano-powder

A nanopowder, in-situ synthesis technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc.

Inactive Publication Date: 2014-03-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At such a high temperature, the traditional yttria partially stabilized zirconia (PSZ) material is difficult to meet the high temperature requirements due to problems such as phase transition failure, severe sintering, thermal expansion mismatch and high thermal conductivity.

Method used

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  • In situ synthesis method for Gd2Zr2O7/ZrO2(3Y) nano-powder
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  • In situ synthesis method for Gd2Zr2O7/ZrO2(3Y) nano-powder

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Experimental program
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Effect test

Embodiment 1

[0024] Will Gd 2 o 3 , ZrOCl 2 .8H 2 O, Y 2 o 3 The raw materials are weighed according to the precise chemical ratio and dissolved in HNO 3 Prepare a rare earth mixed solution with an initial mother salt solution concentration of 0.05 mol / L, and at the same time prepare a pH=11.0 ammonia solution with a concentration of 0.5 mol / L as a precipitant, use in-situ reverse titration, and use a peristaltic pump to remove the precipitant Drop into the mother salt solution, and at the same time, use a magnetic device to continuously stir the precursor precipitate for 1 to 4 hours to complete the reaction and achieve uniform dispersion. Finally, a white flocculent precipitate was obtained. After aging for 24 h, the precursor precipitate was washed three times with deionized water to remove impurity ions, and then washed twice with absolute ethanol. After filtering, it was dried in a vacuum oven at 60°C for 24 hours. Gd was prepared by wet ball milling for 12 hours, and then calci...

Embodiment 2

[0026] Be prepared with the rare earth mixed solution that the initial mother salt solution concentration is 0.10 mol / L, other conditions are as embodiment 1, such as Figure 4 As shown, the agglomeration of the powder is serious, and the particle size difference is large, and the particle size is about 240nm.

Embodiment 3

[0028] Be prepared with the rare earth mixed solution that the initial mother salt solution concentration is 0.15 mol / L, other conditions are as embodiment 1, such as Figure 5 As shown, the powder agglomeration is obvious, the size of the particles is uneven, and the particle size is about 280nm.

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Abstract

The invention provides an in situ synthesis method for Gd2Zr2O7 / ZrO2(3Y) nano-powder, relating to the method for preparing the nano-powder for a thermal barrier coating material. The method comprises steps of accurately weighing raw materials Gd2O3, ZrOC12.8H2O and Y2O3 according to chemical proportion; then respectively dissolving into HNO3 so as to prepare a rare earth mixed solution, wherein ammonia water (NH3.H2O) is taken as a precipitator, pH value of precursor precipitate is controlled to be 9-12; titrating by a peristaltic pump so as to obtain white flocculent precipitate, wherein 1-4 hours of magnetic stirring goes with titration so as to allow the reaction to be carried out completely; after washing and filtering the white flocculent precipitate, drying for 24 hours in a vacuum drying oven at 60-80 DEG C; ball milling for 12-24 hours through a wet method; putting into a muffle furnace and calcining for 2-4 hours at high temperature so as to obtain the Gd2Zr2O7 / ZrO2(3Y) nano composite powder. The Gd2Zr2O7 / ZrO2(3Y) nano composite powder prepared by the method has the advantages that the appearance is near-spherical, the particle size is small, and the crystal particles are uniformly distributed and are not agglomerated; phase grain size is easy to control, and the method is simple and is very suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing nano powder of thermal barrier coating materials, in particular to an in-situ synthesis of Gd 2 Zr 2 o 7 / ZrO 2 (3Y) The method of nanopowder. Background technique [0002] With the development of aero-engines towards high flow ratio, high thrust-to-weight ratio and high turbine inlet speed, the temperature of engine hot-end parts has exceeded 1500°C. At such a high temperature, the traditional yttria partially stabilized zirconia (PSZ) material has been difficult to meet the high temperature requirements due to problems such as phase transition failure, severe sintering, thermal expansion mismatch and high thermal conductivity. Gd 2 Zr 2 o 7 Rare earth zirconate materials have lower thermal conductivity than YSZ, good thermal insulation effect, and good chemical stability and phase stability at high temperatures, and are one of the best candidate materials for thermal barrier coating ceramic layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626B82Y30/00
Inventor 马伟民宋晗马澜孙杨马雷
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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