Method for preparing nanometer zirconium oxide for thermal barrier coating

A technology of thermal barrier coatings and nanomaterials, applied in the direction of zirconia, etc., can solve the problems of difficult washing of nanopowders, easy adsorption of impurity ions, wide product particle size distribution, etc., to achieve good technical stability, stable product quality, particle size narrow distribution effect

Inactive Publication Date: 2006-04-12
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

Among them, the precipitation method has a simple process, but the prepared product has a wide particle size distribution and is easy to agglomerate; the spray pyrolysis method has the advantages of short process and low cost, but has high requirements for equipment, and a large amount of corrosive gas is decomposed during the production process; the hydrothermal method The prepared nanopowder has the advantages of narrow particle size distribution and good particle dispersibility, but the nanopowder prepared by traditional hydrothermal technology is difficult to wash, and the surface is easy to adsorb impurity ions, resulting in affected properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to the ratio of 1:2, 580g ZrOCl 2 ·8H 2 O is dissolved in 1160g water to obtain a concentration of 33.3% aqueous solution, 12g of yttrium oxide is dissolved in 60g of 20wt% hydrochloric acid to obtain yttrium chloride solution, the yttrium chloride solution is mixed with the zirconium oxychloride solution, and ammonia is added in the solution When the pH value of the solution is 7.0, filter and separate, put the filter cake into a reaction kettle after beating with water, raise the temperature to 150°C at a rate of 2°C / min and react at a constant temperature for 7 hours, cool to room temperature, and filter the product to remove the supernatant Liquid and solid wet materials are dispersed in deionized water and spray-dried. The powder is heated to 700°C at a heating rate of 4°C / min and kept at a constant temperature for 1 hour, then cooled to room temperature to obtain zirconia, a nanomaterial suitable for electron beam physical vapor deposition. The tetragon...

Embodiment 2

[0023] According to the ratio of 1:5, 1000g ZrOCl 2 ·8H 2 O is dissolved in 5000g water to obtain a concentration of 16.7% aqueous solution, 33g of yttrium oxide is dissolved in 260g of 20wt% hydrochloric acid to obtain yttrium chloride solution, the yttrium chloride solution is mixed with the zirconium oxychloride solution, and ammonia is added in the solution When the pH value of the solution is 8.0, filter and separate, put the filter cake into a reaction kettle after beating with water, raise the temperature to 260°C at a rate of 5°C / min and react at a constant temperature for 2 hours, cool to room temperature, and filter the product to remove the supernatant Liquid and solid wet materials are dispersed in deionized water and spray-dried. The powder is heated to 700°C at a heating rate of 10°C / min and kept at a constant temperature for 4 hours, and then cooled to room temperature to obtain zirconia, a nanomaterial suitable for electron beam physical vapor deposition. The ...

Embodiment 3

[0025] According to the ratio of 1:2, 580g ZrOCl 2 ·8H 2 O is dissolved in 1160g water to obtain a concentration of 33.3% aqueous solution, 12g of yttrium oxide is dissolved in 60g of 20wt% hydrochloric acid to obtain yttrium chloride solution, the yttrium chloride solution is mixed with the zirconium oxychloride solution, and ammonia is added in the solution When the pH value of the solution is 7.0, filter and separate, put the filter cake into a reaction kettle after beating with water, raise the temperature to 150°C at a rate of 2°C / min and react at a constant temperature for 7 hours, cool to room temperature, and filter the product to remove the supernatant Liquid, solid wet material plus water beating; 3.2gAlCl 3 ·6H 2 O was dissolved in water to obtain aluminum chloride solution, which was added to the above slurry, and ammonia water was added to adjust the pH value of the solution to 7.0, filtered and separated, and the solid wet material was dispersed in deionized wa...

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Abstract

A process for preparing zirconium oxide nano-particles used for coated thermal barrier layer includes such steps as preparing the mixed solution of zirconium oxychloride and yttrium oxide (or chloride), adding ammonia water, washing for dispersing, hydrothermal reaction to generate Y-stabilized ZrO2 nano-particles, separating, coating by aluminium oxide, drying, granulating and heat treating.

Description

(1) Technical field [0001] The invention relates to a preparation method of a zirconia nanometer material for a thermal barrier coating, belonging to the field of inorganic non-metallic materials. (2) Background technology [0002] With the development of aero-engines with high thrust-to-weight ratio and high efficiency, the airflow temperature in the engine continues to increase. The superalloys currently used must be protected by high-temperature resistant coatings, and thermal barrier coating technology is a high-thrust-to-weight ratio, high-performance aero-engine State-of-the-art coating technology to be used on hot end components. Thermal barrier coatings are mainly used to provide high-temperature insulation protection for turbine engine blades working under high-temperature thermal airflow conditions, thereby significantly reducing the temperature of the blade substrate. The ceramic layer in the coating isolates the influence of hot air flow and plays the following ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02
Inventor 陈代荣焦秀玲
Owner SHANDONG UNIV
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