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Sintering-preventing long-service-life double-layer gradient structure thermal barrier coating and preparation method thereof

A technology of thermal barrier coating and gradient structure, which is applied in the direction of coating, metal material coating process, and device for coating liquid on the surface, etc. It can solve the problem of TBC heat insulation function decline, affecting the service life of the coating, and heat insulation pores Disappearance and other problems, to overcome the sharp decline in thermal insulation performance, quickly realize engineering applications, and reduce the driving force of cracking

Active Publication Date: 2019-06-18
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the thermal insulation function of TBC after high temperature service will be significantly reduced, which is mainly due to the healing and disappearance of thermal insulation pores inside the coating caused by sintering.
On the other hand, sintering also causes significant rigidification of the coating, which is prone to cracking and peeling, which affects the service life of the coating

Method used

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  • Sintering-preventing long-service-life double-layer gradient structure thermal barrier coating and preparation method thereof
  • Sintering-preventing long-service-life double-layer gradient structure thermal barrier coating and preparation method thereof

Examples

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Embodiment 1

[0045] see figure 1 As shown, the preparation process of the present invention is described by taking the heat insulation layer 4 as an example with three sublayers.

[0046] A method for preparing an anti-sintering long-life double-layer gradient thermal barrier coating, comprising the following steps:

[0047] Step 1. Prepare a metal bonding layer 2 with a thickness of 150 μm on the surface of the cylindrical superalloy substrate 1 by using 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.

[0048] Step 2. On the metal bonding layer 2, 8YSZ smelting and crushing powder with a particle size of 5 μm to 25 μm is used to prepare a toughening layer 3 with a thickness of 150 μm by atmospheric plasma spraying. In the process of spraying, in order to make the interlayer bonding rate of the first sheet unit 5 not lower than 50%, use a heating platform to preheat the substrate to 400...

Embodiment 2

[0066] 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

[0068] The difference between this example and Example 1 is that in step 1, the thickness of the metal bonding layer 2 is 100 μm; in step 2, the temperature of the substrate is preheated to 300° C. during the deposition process; in steps 3 to 5, During the deposition process, the temperature of the substrate is controlled to not exceed 180°C.

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Abstract

The invention discloses a sintering-preventing long-service-life double-layer gradient structure thermal barrier coating and a preparation method thereof. The coating comprises a toughening layer which is internally located and a heat insulation layer which is externally located; the heat insulation layer is formed by the stacking of N secondary layers, the thickness of each secondary layer is equal to the heat conduction rate thereof, and the heat conduction rates of the secondary layer is decreased in equal difference from the first secondary layer to the N secondary layer; the toughening layer takes up 10%-15% of the total thickness of the double-layer structure thermal barrier coating; the heat insulation layer takes up 50%-90% of the total thickness of the double layer, the heat conduction rate of a second thermal barrier coating material and a third thermal barrier coating material at the temperature of 1000-1600 DEG C does not exceed 2.5 W / m.K. the coating has the advantagesthat the purpose of sintering resisting under a high-temperature environment of a ceramic coating can be achieved, the fracturing toughness of the coating is reinforced by the toughening layer, the fracturing driving force of the coating is reduced by the gradient structure, and the long service life of the thermal barrier coating is achieved.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to an anti-sintering long-life double-layer gradient structure thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings (Thermal barrier coatings, TBC) is a functional coating that acts as a heat shield, and is widely used in high-temperature hot-end metal components of aero-engines and gas turbines, so that the alloy matrix can withstand temperatures far beyond its temperature limit. Can serve stably. Usually, a TBC with a thickness of 300-500 μm can increase the temperature bearing capacity of the alloy by 50-300°C. This is due to the fact that TBC mostly uses ceramic materials with low thermal conductivity. More importantly, TBC prepared by spraying method contains a large number of micron and submicron pores inside, which play a good role in heat insulation. Therefore, the porous structure is an important prerequisite to...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D7/00C23C4/12C23C4/06
Inventor 李广荣王丽爽杨冠军刘梅军刘宏李成新李长久
Owner 咸阳瞪羚谷新材料科技有限公司
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