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Columnar layer double-mode structure thermal barrier coating and preparation method thereof

A technology of thermal barrier coating and structural heat, applied in coating, metal material coating process, fusion spraying, etc., can solve the problem of sacrificing heat insulation ability, achieve excellent heat insulation performance, improve service life, high strain The effect of tolerance

Active Publication Date: 2019-01-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned process sacrifices the thermal insulation ability in the longitudinal direction due to the formation of a dense coating structure while obtaining a columnar structure with a long life.

Method used

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  • Columnar layer double-mode structure thermal barrier coating and preparation method thereof
  • Columnar layer double-mode structure thermal barrier coating and preparation method thereof
  • Columnar layer double-mode structure thermal barrier coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] A preparation process of a thermal barrier coating with a high heat insulation and long life column / layer dual-mode structure, comprising the following steps:

[0047] On the surface of the superalloy substrate and its bonding layer, 8YSZ spraying powder with a particle size of 45 μm to 75 μm was used to prepare a layered ceramic coating with a thickness of 200 μm and an interlayer bonding rate of 28% by spraying with atmospheric plasma technology, such as Picture 1-1 and Figure 1-2 shown. Then the YSZ coating surface is heated by flame, and the coating and the substrate are simultaneously raised to 1200 ° C within 5 minutes. Then adopt a strong current impact with a liquid flow velocity of 20m / s and a liquid flow diameter of 0.5mm to reduce the coating temperature to below 200°C within 10s. During the cooling and shrinking process, the coating is restrained by the matrix and generates transverse tensile stress inside the coating, thereby forming large-scale longitud...

Embodiment 2

[0049] On the surface of the superalloy substrate and its bonding layer, 8YSZ spray powder with a particle size of 45m ~ 75m was used to spray and prepare a layered ceramic coating with a thickness of 200m and an interlayer bonding rate of 28% by atmospheric plasma technology, and then through the flame. The YSZ coating surface is heated, and the coating and the substrate are simultaneously raised to 1350°C within 5 minutes. Then adopt a strong current impact with a liquid flow velocity of 20m / s and a liquid flow diameter of 0.5mm to reduce the coating temperature to below 300°C within 10s. During the cooling and shrinking process, the coating is bound by the matrix to generate transverse tensile stress inside the coating, thereby forming large-scale longitudinal pores.

Embodiment 3

[0051] On the surface of the superalloy substrate and its bonding layer, 8YSZ spray powder with a particle size of 45m ~ 75m was used to spray and prepare a layered ceramic coating with a thickness of 200m and an interlayer bonding rate of 28% by atmospheric plasma technology, and then through the flame. The YSZ coating surface is heated, and the coating and the substrate are simultaneously raised to 900°C within 5 minutes. Then adopt a strong current impact with a liquid flow velocity of 20m / s and a liquid flow diameter of 0.5mm to reduce the coating temperature to below 200°C within 10s. During the cooling and shrinking process, the coating is bound by the matrix to generate transverse tensile stress inside the coating, thereby forming large-scale longitudinal pores.

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Abstract

The invention provides a columnar layer double-mode structure thermal barrier coating and a preparation method thereof, wherein the thermal barrier coating is formed by stacking flat particle layers formed by material powder to form a layered structure, has vertical pores, and is divided into a plurality of blocks by the vertical pores to form a columnar structure. During the preparation, thermalbarrier coating powder is subjected to spray deposition through a thermal spray coating method to prepare a layered thermal barrier coating formed by stacking flat particles, and a plurality of vertical pores are formed in the layered thermal barrier coating through a stress excitation and pore induction pretreatment process to obtain the columnar layer double-mode structure thermal barrier coating. According to the present invention, with the columnar layer double-mode structure thermal barrier coating, the service life of the coating is significantly prolonged while the vertical thermal insulation performance of the coating is maintained so as to integrate the high thermal insulation and long service life of the coating.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a thermal barrier coating and a preparation process thereof. Background technique [0002] As the core equipment of efficient and clean energy power system, gas turbine manufacturing technology has become an important symbol to measure a country's industrial level. High efficiency and low energy consumption are the eternal goals of gas turbines, and the improvement of efficiency will inevitably increase the temperature and pressure of the gas in the combustion chamber. At present, the gas temperature is close to 2000K, which is far higher than the limit temperature (~1400K) that the hot-end component material (superalloy) can withstand. Thermal barrier coating is an effective method to break through the bottleneck of high temperature resistance of hot end components. By coating the high-melting point material with relatively low thermal conductivity on the surface of the super...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11
CPCC23C4/11C23C4/134
Inventor 杨冠军李广荣唐春华刘梅军刘宏李成新李长久
Owner XI AN JIAOTONG UNIV
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