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A kind of thermal barrier coating material with core-shell structure and preparation method thereof

A technology of core-shell structure and thermal barrier coating, which is applied in the direction of coating, chemical instruments and methods, metal material coating technology, etc., to achieve the effect of improving structural stability, low thermal conductivity, and good heat insulation effect

Active Publication Date: 2021-06-08
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a high thermal expansion coefficient, good thermal stability, better anti-sintering performance, better heat insulation effect, and more energy-saving performance for the existing single thermal barrier coating material. Thermal barrier coating material with core-shell structure and preparation method thereof that satisfies development needs of thermal barrier coating materials well

Method used

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  • A kind of thermal barrier coating material with core-shell structure and preparation method thereof
  • A kind of thermal barrier coating material with core-shell structure and preparation method thereof
  • A kind of thermal barrier coating material with core-shell structure and preparation method thereof

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Effect test

Embodiment 1

[0048] (1) Weigh the raw materials of lanthanum nitrate hexahydrate and cerium nitrate hexahydrate according to the atomic molar ratio of La and Ce at 5:1, dissolve them completely with deionized water, and mix them evenly under the action of magnetic stirring; add 0.02mol / L phosphoric acid dropwise Sodium solution is used as precipitant, pH is 8, stop dropping, magnetically stir to obtain suspension evenly;

[0049] (2) Transfer the suspension to a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time of the hydrothermal reaction is 24h, and the precipitate after the hydrothermal reaction is obtained;

[0050] (3) The precipitate was repeatedly washed with deionized water and absolute ethanol until the pH of the filtrate was 7; the washed precipitate was dried in an oven at 70°C for 12h, and then calcined in a muffle furnace at 500°C for 2h to obtain cerium The lanthanum acid core, the lanthanum cerate core has an octah...

Embodiment 2

[0056] (1) Weigh the raw materials of lanthanum nitrate hexahydrate and cerium nitrate hexahydrate according to the La / Ce atomic molar ratio of 10:1, dissolve them completely in deionized water, and mix them evenly under the action of magnetic stirring; add 0.02mol / L phosphoric acid dropwise Sodium solution is used as precipitant, pH is 8, stop dropping, magnetically stir to obtain suspension evenly;

[0057] (2) Transfer the suspension to a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time of the hydrothermal reaction is 24h, and the precipitate after the hydrothermal reaction is obtained;

[0058] (3) The precipitate was repeatedly washed with deionized water and absolute ethanol until the pH of the filtrate was 7; the washed precipitate was dried in an oven for 12 hours, and then calcined in a muffle furnace at 500°C for 2 hours to obtain lanthanum cerate Inner core, the inner core of lanthanum cerate is octahedra...

Embodiment 3

[0064] (1) Weigh the raw materials of lanthanum nitrate hexahydrate and cerium nitrate hexahydrate according to the La / Ce atomic molar ratio of 1:1, dissolve them completely with deionized water, and mix them evenly under the action of magnetic stirring; add 0.02mol / L phosphoric acid dropwise Sodium solution is used as precipitant, pH is 8, stop dropping, magnetically stir to obtain suspension evenly;

[0065] (2) Transfer the suspension to a hydrothermal kettle for hydrothermal reaction, the temperature of the hydrothermal reaction is 180°C, the time of the hydrothermal reaction is 24h, and the precipitate after the hydrothermal reaction is obtained;

[0066](3) The precipitate was repeatedly washed with deionized water and absolute ethanol until the pH of the filtrate was 7; the washed precipitate was dried in an oven for 12 hours, and then calcined in a muffle furnace at 500°C for 2 hours to obtain lanthanum cerate Inner core, the inner core of lanthanum cerate is octahedra...

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Abstract

A thermal barrier coating material with a core-shell structure and a preparation method thereof. The thermal barrier coating material with a core-shell structure uses cerate as the core and zirconate as the shell. The invention also includes a preparation method of the thermal barrier coating material with a core-shell structure. The thermal barrier coating material with a core-shell structure of the present invention has high thermal expansion coefficient, good thermal stability, better sintering resistance, better heat insulation effect, and can better meet the development needs of thermal barrier coating materials.

Description

technical field [0001] The invention relates to a thermal barrier coating material with a core-shell structure and a preparation method thereof. Background technique [0002] Currently commonly used thermal barrier coating material is 8%wtY 2 o 3 Stabilized ZrO 2 , namely 8YSZ. However, when this thermal barrier coating material is used for a long time at a temperature higher than 1200 ° C, it will undergo phase change and volume mutation, thereby forming cracks or even falling off and failing; it will also undergo severe sintering, increase in density, and reduce thermal conductivity. It also increases, reducing its heat insulation effect; after the coating is sintered, a large number of microcracks are generated, which makes it easier for oxygen to penetrate and accelerate the oxidation of the substrate. With the increase of the thrust-to-weight ratio of aero-engines, higher requirements are put forward for thermal barrier coating materials. Specifically, higher meltin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/00C01F17/241C01F17/10C23C4/134C23C4/11B82Y30/00
CPCC01G25/00C23C4/134C23C4/11B82Y30/00C01P2004/80C01P2002/36C01P2002/30C01F17/206
Inventor 黄建平刘安民王颖吴远志刘伟邓彬
Owner HUNAN INST OF TECH
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