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Preparation method of thermal barrier coating with interlayer pore structure

A technology of pore structure and thermal barrier coating, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of affecting the stability of plasma flame flow, difficult to obtain uniform coating of structure, etc., and achieve excellent high temperature Phase stability, lower thermal conductivity, and improved thermal cycle life effects

Active Publication Date: 2019-08-09
INNER MONGOLIA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of solution plasma spraying is that the coating preparation process is simple, and the prepared coating has an interlayer pore structure. However, when preparing thermal barrier coatings of different materials, the properties of metal salts in the precursor solution are quite different. When the active metal salt is contained in the spraying process, the violent heat absorption or heat release and the rapid release of gas products will affect the stability of the plasma flame, making it difficult to obtain a coating with a uniform structure.

Method used

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  • Preparation method of thermal barrier coating with interlayer pore structure
  • Preparation method of thermal barrier coating with interlayer pore structure
  • Preparation method of thermal barrier coating with interlayer pore structure

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preparation example Construction

[0030] The present invention has the preparation method of interlayer pore structure thermal barrier coating, and its chemical formula is La 2 (Ce 1-x Zr x ) 2 o 7 (0≤x≤0.8). Its preparation process comprises: (1) heat treatment La 2 o 3 , CeO 2 , ZrO 2 powder; (2) mix heat-treated powder in proportion and add deionized water and dispersant ball mill; (3) dry and heat-treat the slurry after ball milling to form a phase; (4) mix phase-formed powder, deionized water and dispersant The solution was mixed and ball milled to prepare a suspension; (5) the suspension was used as a raw material to prepare La with interlayer pore structure by plasma spraying method. 2 (Ce 1-x Zr x ) 2 o 7 coating.

[0031] The preparation method of the thermal barrier coating with interlayer pore structure of the present invention comprises the following steps:

[0032] (1) The heat-treated powders A, B, C plus deionized water and dispersant are mixed and ball-milled to obtain slurry D. ...

Embodiment 1

[0040] Embodiment 1: prepare La with interlayer pore structure 2 Ce 2 o 7 Coating, the specific steps are as follows:

[0041] (1) La 2 o 3 , CeO 2 The powder was kept at 1000°C for 2h.

[0042] (2) Heat-treated CeO 2 , La 2 o 3 The powder is mixed according to the molar ratio of 2:1, and deionized water, balls and dispersant are added to the mixed powder, and ball milled with a planetary ball mill for 2 hours, wherein the mass of deionized water added is the same as the total mass of the mixed powder, and the added dispersant is The ammonium polyacrylate aqueous solution with a mass concentration of 30% is added in an amount of 10% of the total mass of the mixed powder.

[0043] (3) The ball-milled slurry was dried at 100°C for 48h, and the dried powder was put into a muffle furnace and heat-treated at 1300°C for 6h to form a phase. Such as figure 1 Shown, La after heat treatment 2 Ce 2 o 7 The thermogravimetric-differential scanning calorimetry curve of the pow...

Embodiment 2

[0052] Embodiment 2: prepare La with interlayer pore structure 2 (Ce 0.3 Zr 0.7 ) 2 o 7 Coating, the specific steps are as follows:

[0053] (1) La 2 o 3 , CeO 2 , ZrO 2 The powder was kept at 1000°C for 2h.

[0054] (2) heat-treated La 2 o 3 , CeO 2 , ZrO 2 The powder is mixed according to the molar ratio of 1:0.3:0.7. Add deionized water, milling balls, and dispersant to the mixed powder, and use a planetary ball mill to mill for 2 hours. The mass of deionized water added is the same as the total mass of the mixed powder. The added dispersant The agent is an aqueous ammonium polyacrylate solution with a mass concentration of 40%, and the addition amount is 15% of the total mass of the mixed powder.

[0055] (3) The ball-milled slurry was dried at 100°C for 48h, and the dried powder was put into a muffle furnace and heat-treated at 1400°C for 12h to form a phase.

[0056] (4) La 2 (Ce 0.3 Zr 0.7 ) 2 o 7 The phase-forming powder, deionized water, and dispers...

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Abstract

The invention relates to a preparation method of a thermal barrier coating with an interlayer pore structure. The preparation method comprises the following steps of performing heat treatment on the La2o3, Ceo2, Zro2 powders; mixing the heat-treated powders with a dispersing agent according to a ratio, adding deionized water and carrying out ball milling to obtain slurry; the molar ratio of La2o3,Ceo2, Zro2 powders are 0.5:(1-X): X, wherein X is greater than or equal to 0 and less than or equal to 0.8; drying the ball-milled slurry and carrying out heat treatment to form a phase, so as to obtain the phase-forming powders; mixing the phase-forming powders with deionized water and the dispersing agent for ball milling to obtain a suspension liquid; taking the suspension liquid as a raw material, and spraying the suspension liquid on a matrix material by adopting a suspension liquid plasma spraying method. The La2 (Ce1-xZrx) 2O7 coating prepared by adopting the suspension liquid plasma spraying method has excellent high-temperature phase stability, the prepared coating has a uniform interlayer pore structure, the structure is beneficial to reducing the heat conductivity of the coating and prolonging the heat cycle life of the coating.

Description

technical field [0001] The invention relates to a preparation method of a novel structural thermal barrier coating, in particular to a La 2 (Ce 1-x Zr x ) 2 o 7 (0≤x≤0.8) Preparation method of thermal barrier coating. Background technique [0002] Thermal barrier coatings are widely used in aero-engines and ground gas turbines. The thermal barrier coating material with low thermal conductivity reduces the working temperature of the base material, alleviates the thermal corrosion of the base material in the high-temperature environment, and prolongs the service life of the high-temperature hot-end components of the gas turbine. [0003] The widely used thermal barrier coating material is yttria partially stabilized zirconia (YSZ, ZrO 2 —6~8wt%Y 2 o 3 ). Since the YSZ material is used above 1200°C for a long time, the phase transformation will be intensified and the sintering rate will be accelerated, thereby greatly reducing its life. And La 2 (Ce 1-x Zr x ) 2 o...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C23C4/073
CPCC23C4/073C23C4/11C23C4/134
Inventor 马文黄威齐英伟杨挺董红英白玉刘彩文
Owner INNER MONGOLIA UNIV OF TECH
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