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Zirconium dioxide-based ceramic thermal insulation material substituted and doped with multi-element rare earth elements and preparation method thereof

A rare earth element replacement and zirconia-based technology, applied in the field of thermal protection, can solve the problems of reduced coating porosity and microcracks, failure to meet the turbine inlet temperature, poor high temperature phase stability, etc., to improve anti-sintering performance, Improved thermal cycle performance and low cost effects

Pending Publication Date: 2022-01-11
XI AN JIAOTONG UNIV +1
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Problems solved by technology

Yttria partially stabilized zirconia (YSZ) material is widely used in engine hot-end parts due to its low thermal conductivity and high mechanical strength, but its high-temperature phase stability is poor, and it will occur when it is used for a long time at 1200 °C. Tetragonal phase to monoclinic phase transition, causing the volume expansion of the coating and causing its spalling failure
In addition, the sintering resistance of YSZ material is not good. When sintering at high temperature, the coating will be densified, which will reduce the porosity and microcracks of the coating, resulting in an increase in thermal conductivity and a decrease in heat insulation performance. Therefore, YSZ can no longer meet the requirements of turbine inlets. The need for a further increase in temperature

Method used

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  • Zirconium dioxide-based ceramic thermal insulation material substituted and doped with multi-element rare earth elements and preparation method thereof
  • Zirconium dioxide-based ceramic thermal insulation material substituted and doped with multi-element rare earth elements and preparation method thereof
  • Zirconium dioxide-based ceramic thermal insulation material substituted and doped with multi-element rare earth elements and preparation method thereof

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preparation example Construction

[0031] Another aspect of the present invention provides a method for preparing a zirconia-based ceramic heat-insulating material substituted with multi-element rare earth elements, which uses the original oxide suspension to prepare—the route of low-temperature plasma fast burning and rapid quenching in water, which specifically includes Follow the steps below:

[0032] 1) Make solvent with absolute ethanol, according to stoichiometric ratio xGd 2 o 3 -ySc 2 o 3 -(1-x-y)(ZrO 2 -1mol%Y 2 o 3 ); 3mol%≤x≤4mol%, 1mol≤y≤2mol%, the weighed Gd 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 The mixed oxide was wet ball milled for 24-48h to obtain a white suspension of the mixed oxide;

[0033] 2) Use low-temperature plasma equipment to transport the suspension to the flame center of the low-temperature plasma jet, make it atomized, crushed, solvent evaporated, and sintered rapidly, and then sprayed into a container filled with water to complete water quenching, after standing After...

Embodiment 1

[0035] Preparation of the original oxide suspension - low-temperature plasma fast burning and rapid quenching in water to prepare a multi-element rare earth element substitution doped zirconia-based ceramic insulation material, the material composition is 4.0mol% Gd 2 o 3 -1.0mol% Sc 2 o 3 -1.0mol% Y 2 o 3 -94.0mol% ZrO 2 , abbreviated as 8Gd2Sc2YSZ.

[0036] The preparation method of the zirconia-based ceramic heat-insulating material substituted with multi-component rare earth elements is as follows:

[0037] 1) Calculate the required oxide Gd according to the doping amount 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 The mass of , respectively 0.361088g, 0.067794g, 0.076602g, 3.02915g (Gd 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 The molar ratio is 4:1:1:94). The weighed Gd 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 Mix them and place them in a zirconia ball mill jar, then add a certain amount of absolute ethanol to ensure that the solid phase content is 60%, and wet b...

Embodiment 2

[0044] Preparation of the original oxide suspension - low-temperature plasma fast burning and rapid quenching in water to prepare multi-element rare earth element substitution doped zirconia-based ceramic insulation materials, the material composition is 3.0mol% Gd 2 o 3 -2.0mol% Sc 2 o 3 -1.0mol% Y 2 o 3 -94.0mol% ZrO 2 , abbreviated as 6Gd4Sc2YSZ.

[0045] The preparation method of the zirconia-based ceramic heat-insulating material substituted with multi-component rare earth elements is as follows:

[0046] 1) Calculate the required oxide Gd according to the molar amount of doping 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 The masses are 0.270816g, 0.135588g, 0.076602g, 3.02915g (Gd 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 The molar ratio is 3:2:1:94). The weighed Gd 2 o 3 、Sc 2 o 3 , Y 2 o 3 and ZrO 2 Mix them and place them in a zirconia ball mill jar, then add a certain amount of absolute ethanol to ensure that the solid phase content is 50%, and wet ball ...

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Abstract

The invention provides a zirconium dioxide-based ceramic thermal insulation material substituted and doped with multi-element rare earth elements and a preparation method. Compared with traditional YSZ, the zirconium dioxide-based ceramic thermal insulation material has better high-temperature use performance and lower thermal conductivity. The preparation method comprises the following steps: mixing nanoscale Gd2O3 powder, nanoscale Sc2O3 powder, nanoscale Y2O3 powder and nanoscale ZrO2 powder which are weighed according to a stoichiometric ratio, carrying out wet ball-milling treatment for a certain time by taking absolute ethyl alcohol as a solvent to form a suspension of the mixed oxide, spraying the suspension into a container filled with water by utilizing low-temperature plasma equipment, standing, drying and grinding to obtain the required doped zirconium oxide powder. According to the invention, the material is prepared by adopting a technical route of original oxide suspension preparation, low-temperature plasma fast firing and water fast quenching collection, further desalting treatment is not needed, and the preparation method has the advantages of simple process, controllable operation and small environmental pollution.

Description

technical field [0001] The invention relates to the field of thermal protection suitable for turbine blades of aero-engines, in particular to a zirconia-based ceramic heat insulating material substituted and doped with multielement rare earth elements and a preparation method thereof. Background technique [0002] High-temperature materials, film cooling and thermal barrier coatings are the "three key core technologies" of aero-engines. With the development of aero-engines in the direction of large thrust-to-weight ratio and high fuel efficiency, accompanied by a significant increase in the intake air temperature before the turbine, the potential for improvement of high-temperature materials and film cooling technology is very limited. Thermal barrier coatings are currently internationally recognized, The most feasible measure to increase the inlet temperature before the engine turbine. Yttria partially stabilized zirconia (YSZ) material is widely used in engine hot-end par...

Claims

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Application Information

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IPC IPC(8): C04B35/488C04B35/626
CPCC04B35/488C04B35/62605C04B2235/3225C04B2235/3224C04B2235/5454
Inventor 白宇邓玺范薇王玉
Owner XI AN JIAOTONG UNIV
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