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Anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and preparation method thereof

A technology of thermal barrier coating and composite structure, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of coating cracking and peeling, affecting service life, increasing strain energy release rate, etc. Sharp decline, long-life co-design, reduced driving force effect

Active Publication Date: 2019-04-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, long-term high-temperature service will also cause rapid hardening of the coating, making the cumulative strain energy release rate (G i ) increased significantly, which in turn caused the cracking and peeling of the coating, affecting the service life

Method used

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  • Anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and preparation method thereof
  • Anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and preparation method thereof
  • Anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and preparation method thereof

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Embodiment 1

[0035] see figure 1 and figure 2 As shown, the preparation method of the present invention is described by taking the ceramic heat insulating layer 3 as an example with three sublayers.

[0036] The invention provides a method for preparing a thermal barrier coating with an anti-sintering long-life gradient column layer composite structure, which comprises the following steps:

[0037] In step 1, a metal bonding layer 2 with a thickness of 100 μm is prepared on the surface of a cylindrical superalloy substrate 1 by a low-pressure plasma spraying process. The material of the metal bonding layer 2 is spherical NiCoCrAlTaY powder with a particle size of 10 μm-40 μm.

[0038] Step 2, preparing the first sub-layer 31 of the ceramic heat-insulating layer 3 on the metal bonding layer 2 by the method of mixed spraying, which specifically includes the following steps:

[0039] Step 2.1, using yttria-stabilized zirconia smelting and crushing powder with a particle size of 20 μm to 5...

Embodiment 2

[0058] The difference between this embodiment and embodiment 1 is that in step 1, the thermal spraying method used is vacuum plasma spraying, supersonic flame spraying or cold spraying.

Embodiment 3

[0060] The difference between this embodiment and embodiment 1 is that in step 1, the thickness of the metal bonding layer 2 is 125 μm.

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Abstract

The invention discloses an anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and a preparation method thereof. The coating is divided by longitudinal gaps and formed by superposing N sub-layers and is of a gradient column layer composite structure. The ratios of the thicknesses of all sub-layers to the thermal conductivity are the same. The thermalconductivity of the sub-layers is decreased progressively by the equal difference from the first sub-layer close to a bonding layer to the N sub-layer. Each sub-layer is formed by depositing firstthermal barrier coating material powder and second thermal barrier coating material powder in an alternately-layering manner. The formation compactness of the first thermal barrier coating material powder is greater than that of 90% of slice layer units. The formation compactness of the second thermal barrier coating material powder is less than that of 60% of the slice layer units. The volume ofa second thermal barrier coating material accounts for 10-50% of the total volume of the thermal barrier coating. By means of the anti-sintering long-service-life gradient column layer composite structure thermal barrier coating and the preparation method thereof, the purpose that the ceramic coating resists to sintering in a high-temperature environment is achieved; by means of the gradient columnar structure design, the reverse restriction relation of a singular structure coating for the thermal insulation capability and the service life is broken through; and collaborative design of sintering resistance and the long service life is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an anti-sintering long-life gradient column layer composite structure thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings (Thermal barrier coatings, TBC) are widely used in high-temperature hot-end metal components of aero-engines and gas turbines. As a functional coating for heat insulation, TBC mostly uses ceramic materials with low thermal conductivity. In addition, TBC prepared by thermal spraying method contains a large number of micron and submicron pores and cracks inside. Therefore, TBC has excellent thermal insulation performance under the joint action of low thermal conductivity materials and high thermal insulation porous structure. [0003] Thermal barrier coatings will undergo obvious sintering during long-term high-temperature service, making the pores and cracks inside the coating with thermal insulatio...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/08C23C4/10C23C4/12C23C4/18C23C4/129
CPCC23C4/08C23C4/10C23C4/12C23C4/134C23C4/18
Inventor 李广荣王丽爽杨冠军刘梅军刘宏李成新李长久
Owner XI AN JIAOTONG UNIV
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