Preparation method of lanthanum zirconate spherical powder for thermal spraying

A spherical powder, lanthanum zirconate technology, applied in the field of functional material preparation, can solve the problems of high solid-phase synthesis temperature, high cost of metal salts, long production cycle, etc., to achieve low synthesis cost and avoid particle growth , conversion efficiency and high production efficiency

Inactive Publication Date: 2020-05-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention uses low-cost metal oxides as raw materials, and reusable cheap potassium and sodium salts as reaction media. Compared with the co-precipitation method, it does not need long-term titration, stirring, aging and other processes, and solves the long production cycle of the co-precipitation method. , The problem of high cost of metal salts; compared with the traditional solid-phase method, molten salt as a reaction medium provides a liquid-phase mass transfer environment, which solves the problems of high synthesis temperature and particle growth in the solid-phase method, and makes the prepared powder shape more even

Method used

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  • Preparation method of lanthanum zirconate spherical powder for thermal spraying
  • Preparation method of lanthanum zirconate spherical powder for thermal spraying
  • Preparation method of lanthanum zirconate spherical powder for thermal spraying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Lanthanum oxide and zirconium oxide are used as initial raw materials, wherein the purity of lanthanum oxide is 99.8wt.%, and the purity of zirconia is 99.99wt.%. Weigh 34.16g of lanthanum oxide, 25.84g of zirconia, 33.28g of potassium chloride, and 26.72g of sodium chloride into the ball mill jar together with 240g of zirconia balls and 240mL of ethanol, and mill at 480r / min for 2 hours. After taking it out and drying it, put it into a muffle furnace and raise the temperature to 1200°C at 5°C / min for 4 hours, then cool down to room temperature with the furnace.

[0029] 2) wash with deionized water and suction filter, repeat 3 times, add 25g of 10wt.% PVA solution to the filter cake and stir evenly to obtain a slurry, use airflow spray drying equipment to granulate, the inlet temperature is 240 ° C, and the outlet temperature is 120°C;

[0030] 3) Put the powder obtained after spray granulation into a muffle furnace and raise the temperature at 3°C / min to 1300°C fo...

Embodiment 2

[0034] 1) Lanthanum oxide and zirconium oxide are used as initial raw materials, wherein the purity of lanthanum oxide is 99.8wt.%, and the purity of zirconia is 99.99wt.%. Weigh 34.16g of lanthanum oxide, 25.84g of zirconia, 33.28g of potassium chloride, and 26.72g of sodium chloride into the ball mill jar together with 240g of zirconia balls and 240mL of ethanol, and mill at 480r / min for 2 hours. After taking it out and drying it, put it into a muffle furnace and raise the temperature to 1100°C at 5°C / min for 8 hours, then cool down to room temperature with the furnace.

[0035] 2) Wash with deionized water and suction filter, repeat 3 times, add 60g of 10wt.% PVA solution to the filter cake and stir evenly to obtain a slurry, use spray drying equipment to granulate, the inlet temperature is 240°C, and the outlet temperature is 120°C ;

[0036] 3) Put the powder obtained after spray granulation into a muffle furnace and raise the temperature at 3°C / min to 1400°C for 3 hours...

Embodiment 3

[0038] 1) Lanthanum oxide and zirconium oxide are used as initial raw materials, wherein the purity of lanthanum oxide is 99.8wt.%, and the purity of zirconia is 99.99wt.%. Weigh 34.16g of lanthanum oxide, 25.84g of zirconia, 33.28g of potassium chloride, and 26.72g of sodium chloride into the ball mill jar together with 240g of zirconia balls and 240mL of ethanol, and mill at 480r / min for 2 hours. After taking it out and drying it, put it into a muffle furnace and raise the temperature to 1200°C at 5°C / min for 4 hours, then cool down to room temperature with the furnace.

[0039] 2) Wash with deionized water and suction filter, repeat 3 times, add 25g of 10wt.% PVA solution to the filter cake and stir evenly to obtain a slurry, use spray drying equipment to granulate, the inlet temperature is 240°C, and the outlet temperature is 120°C ;

[0040] 3) Put the powder obtained after spray granulation into a muffle furnace and raise the temperature at 3°C / min to 1400°C for 3 hours...

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Abstract

The invention discloses a preparation method of lanthanum zirconate spherical powder for thermal spraying, wherein the method comprises the following steps: carrying out wet ball milling on La2O3 andZrO2 in a molar ratio of 1:2 and a molten salt medium, uniformly mixing, drying the mixture, heating to 900-1200 DEG C, keeping the temperature for 4-10 h, and cooling to room temperature; washing thereaction product with water to remove the residual molten salt medium, adding a binder and deionized water to obtain slurry, and granulating the slurry by using spray drying equipment to obtain spherical powder; and calcining the prepared spherical powder at high temperature to remove the binder and densify the spherical powder to obtain the lanthanum zirconate spherical powder for thermal spraying. Molten salt is used as a reaction medium to provide a liquid-phase environment, so that the reaction temperature is reduced, and the growth of particles is avoided; oxides are adopted as raw materials, the conversion efficiency and the production efficiency are high, molten salt can be recycled, the synthesis cost is low, time is short, operation is easy, and the method is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and in particular relates to a method for preparing spherical lanthanum zirconate powder used for preparing a thermal barrier coating by an explosive spraying process. Background technique [0002] With the development of aero-engines towards higher thrust-to-weight ratios, the inlet temperature of turbine engines continues to increase. Thermal barrier coating is a thermal protection technology that coats high-temperature resistant, corrosion-resistant, and high-insulation ceramic materials on the surface of the base alloy to improve the resistance to high-temperature oxidation and corrosion of the base alloy and reduce the working temperature of the alloy surface. The hot end part plays a vital role. At present, some yttrium-stabilized zirconia (YSZ), which has the best overall performance and is the most widely used thermal barrier coating material, will undergo pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/00C01F17/10C04B35/626C04B35/50C04B35/48
CPCC01F17/00C01G25/00C01P2002/60C01P2004/32C01P2004/61C04B35/48C04B35/50C04B35/62695C04B2235/5436C04B2235/5445
Inventor 刘平安吴鸿丰岑思谨丁会玲
Owner SOUTH CHINA UNIV OF TECH
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