A kind of preparation method of thermal barrier coating with interlayer pore structure

A pore structure, thermal barrier coating technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems that it is difficult to obtain a uniform coating structure, affect the stability of the plasma flame flow, etc., and achieve excellent high temperature Effects of phase stability, reduction of thermal conductivity, and improvement of thermal cycle life

Active Publication Date: 2021-06-25
INNER MONGOLIA UNIV OF TECH
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  • Claims
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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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  • A kind of preparation method of thermal barrier coating with interlayer pore structure
  • A kind of preparation method of thermal barrier coating with interlayer pore structure
  • A kind of 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. like figure 1 Shown, La after heat treatment 2 Ce 2 o 7 The thermogravimetric-differential scanning calorimetry curve of the powder...

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, which comprises La 2 o 3 , CeO 2 , ZrO 2 The powder is heat-treated; the heat-treated powder is mixed with a dispersant in proportion, and deionized water is added for ball milling to obtain a slurry; La 2 o 3 , CeO 2 , ZrO 2 The molar ratio between the powders is 0.5:(1-x):x, wherein 0≤x≤0.8; the slurry after ball milling is dried and heat-treated to form a phase to obtain a phase-forming powder; the phase-forming powder is mixed with deionized water and dispersed The mixture is ball-milled to obtain a suspension; the suspension is used as a raw material, and the suspension plasma spraying method is used to spray on the base material. The present invention adopts the La prepared by the suspension plasma spraying method 2 (Ce 1‑x Zr x ) 2 o 7 The coating has excellent high-temperature phase stability, and the prepared coating has a uniform interlayer pore structure, which is conducive to reducing the thermal conductivity of the coating and improving the thermal 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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Patent Type & Authority Patents(China)
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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