Preparation of high phase stable composite ceramic powder containing binary rare-earth oxide

A rare earth oxide and composite ceramic technology, which is applied in the field of preparation of high-phase stable composite ceramic powder, can solve the problems of high temperature burning of engine hot end parts, affecting the working safety of the engine, cracking and peeling of thermal barrier coatings, etc., so as to improve the use of life, meet high temperature thermal insulation protection, improve the effect of working temperature and durability

Active Publication Date: 2011-11-09
BEIJING AVIATION MFG ENG INST CHINA AVIATION NO 1 GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently widely used thermal barrier coating material is a single Y 2 o 3 Stable ZrO 2 Ceramic materials, the long-term working temperature of thermal barrier coatings made of this material should not exceed 1200°C, and when the coating exceeds 1200°C, the transformation from tetragonal phase to monoclinic phase will occur when the coating is cooled to room temperature. This phase change makes the volume of the coating abnormal Expansion leads to cracking and peeling off of the thermal barrier coating, resulting in failure of the thermal barrier coating and even high-temperature burnout of the hot end parts of the engine, which affects the working safety of the engine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] To prepare 6.348mol% Sc 2 o 3 -0.552mol% Y 2 o 3 -ZrO 2 As an example, the molar ratio Sc 2 o 3 : Y 2 o 3 : ZrO 2 =6.348:0.552:93.1, then the molar ratio Sc 3+ : Y 3+ : Zr 4+ =11.5:1:84.33.

[0012] Take a small amount of distilled water, adjust the pH to 11 with ammonia water, and obtain an ammonia solution for later use. Massive Sc 3+ : Y 3+ : Zr 4+ =11.5:1:84.33 Measure a certain volume of ZrOCl with a certain concentration 2 ·8H 2 O solution, YCl 3 solution and ScCl 3 Solution, after mixing these three kinds of solutions to obtain a mixed salt solution, add a common industrial dispersant polyethylene glycol PEG1500 with a mass ratio of 5% to the mixed salt solution, fully mix into a uniform transparent solution, and slowly add this transparent solution to the In the pre-configured ammonia solution with pH=11, the mixed salt solution is adjusted with ammonia water during the reaction to maintain the pH value of 11 during the reaction, and a gel is ...

Embodiment 2

[0016] To prepare 2.258mol% Sc 2 o 3 -4.972mol%Y 2 o 3 -ZrO 2 As an example, the molar ratio Sc 2 o 3 : Y 2 o 3 : ZrO 2 =2.258:4.972:92.77, then the molar ratio Sc 3+ : Y 3+ : Zr 4+ =1:2.20:20.54.

[0017] Take a small amount of distilled water, adjust the pH to 11 with ammonia water, and obtain an ammonia solution for later use. Massive Sc 3+ : Y 3+ : Zr 4+ =1:2.20:20.54, measure a certain volume of ZrOCl with a certain concentration 2 ·8H 2 O solution, YCl 3 solution and ScCl 3 solution, after mixing these three kinds of salt solutions to obtain a mixed salt solution, add 5% by mass proportion of general industrial dispersant polyethylene glycol PEG4000 to the mixed salt solution, fully mix into a uniform transparent solution, slowly add this transparent solution Into the pre-configured ammonia solution with pH=11, adjust the mixed salt solution with ammonia water during the reaction to maintain the pH value of 11 during the reaction, and react to obtain a...

Embodiment 3

[0021] To prepare 6.826mol% Sc 2 o 3 -0.324mol% Y 2 o 3 -ZrO 2 As an example, the molar ratio Sc 2 o 3 : Y 2 o 3 : ZrO 2 =6.826:0.324:92.85, then the molar ratio Sc 3+ : Y 3+ : Zr 4+ =21.07:1:143.29.

[0022] Take a small amount of distilled water, adjust the pH to 12 with ammonia water, and obtain an ammonia solution for later use. Massive Sc 3+ : Y 3+ : Zr 4+ =21.07:1:143.29 Measure a certain volume of Zr(CH 3 COO) 4 solution, Y(NO 3 ) 3 solution, Sc(NO 3 ) 3 solution, after mixing these three solutions to obtain a mixed salt solution, add a common industrial dispersant polyethylene glycol PEG15000 with a mass ratio of 5% to the mixed salt solution, fully mix into a uniform transparent solution, and slowly add this transparent solution to the In the pre-configured ammonia solution with pH=12, the mixed salt solution is adjusted with ammonia water during the reaction to keep the pH value at 12 during the reaction, and a gel is obtained through the reactio...

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Abstract

The present invention belongs to the preparation technology of ceramic materials and relates to a preparation method of high phase-stability Sc2O3-Y2O3-ZrO2 composite ceramic powder with binary rare-earth oxides. The high phase-stability Sc2O3-Y2O3-ZrO2 composite ceramic powder is prepared by performing disperse spray drying and calcination of precursor powder. The invention relates to the preparation method of a high phase-stability composite ceramic powder material with the binary rare-earth oxides, the composite ceramic powder material is used for preparing thermal barrier coating, and the material is especially suitable for being used as a thermal barrier coating material of hot-end components of aeroengines and ground gas turbines. The thermal barrier coating prepared by the novel composite ceramic powder with the binary rare-earth oxides has very high phase stability at high temperature, which is beneficial to improving the operating temperature and durability of the thermal barrier coating.

Description

technical field [0001] The invention belongs to the technical field of preparation of oxide ceramic materials, and relates to a preparation method of high-phase stable composite ceramic powder containing binary rare earth oxides. Background technique [0002] Thermal barrier coating is to apply low thermal conductivity oxide ceramic material on the surface of the alloy in the form of coating to reduce the surface temperature of the workpiece working in a high temperature environment, which can not only improve the service life of the workpiece, but also make the existing It is possible to use high-temperature alloy materials in some unbearable high-temperature environments. Coating thermal barrier coatings on the hot end components of aero-engines and ground gas turbines can reduce the surface temperature of components, improve oxidation and corrosion resistance, and greatly extend the service life of components. [0003] Thermal barrier coatings are generally prepared by p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48
Inventor 李其连李勇明刘怀菲王纯
Owner BEIJING AVIATION MFG ENG INST CHINA AVIATION NO 1 GRP
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